--
-- E-Maj: migration from 4.0.1 to 4.1.0
--
-- This software is distributed under the GNU General Public License.
--
-- This script upgrades an existing installation of E-Maj extension.
--

-- Complain if this script is executed in psql, rather than via an ALTER EXTENSION statement.
\echo Use "ALTER EXTENSION emaj UPDATE TO..." to upgrade the E-Maj extension. \quit

--SET client_min_messages TO WARNING;
SET client_min_messages TO NOTICE;

------------------------------------
--                                --
-- Checks                         --
--                                --
------------------------------------
-- Check that the upgrade conditions are met.
DO
$do$
  DECLARE
    v_emajVersion            TEXT;
    v_txid                   TEXT;
    v_nbNoError              INT;
    v_nbWarning              INT;
    v_groupList              TEXT;
  BEGIN
-- The emaj version registered in emaj_param must be '4.0.1'.
    SELECT param_value_text INTO v_emajVersion FROM emaj.emaj_param WHERE param_key = 'emaj_version';
    IF v_emajVersion <> '4.0.1' THEN
      RAISE EXCEPTION 'E-Maj upgrade: the current E-Maj version (%) is not 4.0.1',v_emajVersion;
    END IF;
-- The installed postgres version must be at least 9.5.
    IF current_setting('server_version_num')::int < 90500 THEN
      RAISE EXCEPTION 'E-Maj upgrade: the current PostgreSQL version (%) is not compatible with the new E-Maj version. The PostgreSQL version should be at least 9.5.', current_setting('server_version');
    END IF;
-- Check the E-Maj environment state, if not yet done by a previous upgrade in the same transaction.
    SELECT current_setting('emaj.upgrade_verify_txid', TRUE) INTO v_txid;
    IF v_txid IS NULL OR v_txid <> txid_current()::TEXT THEN
      BEGIN
        SELECT count(msg) FILTER (WHERE msg = 'No error detected'),
               count(msg) FILTER (WHERE msg LIKE 'Warning:%')
          INTO v_nbNoError, v_nbWarning
          FROM emaj.emaj_verify_all() AS t(msg);
      EXCEPTION
-- Errors during the emaj_verify_all() execution are trapped. The emaj_verify_all() code may be incompatible with the current PG version.
        WHEN OTHERS THEN -- do nothing
      END;
      IF v_nbNoError = 0 THEN
        RAISE EXCEPTION 'E-Maj upgrade: the E-Maj environment is damaged. Please fix the issue before upgrading. '
                        'You may execute "SELECT * FROM emaj.emaj_verify_all();" to get more details. '
                        'An "ALTER EXTENSION emaj UPDATE TO ''%'';" statement may be required before.', v_emajVersion;
      END IF;
      IF v_nbWarning > 0 THEN
        RAISE WARNING 'E-Maj upgrade: the E-Maj environment health check reports warning. '
                      'You may execute "SELECT * FROM emaj.emaj_verify_all();" to get more details.';
      END IF;
      IF v_nbWarning IS NOT NULL THEN
        PERFORM set_config('emaj.upgrade_verify_txid', txid_current()::TEXT, TRUE);
      END IF;
    END IF;
-- No existing group must have been created with a postgres version prior 8.4.
    SELECT string_agg(group_name, ', ') INTO v_groupList FROM emaj.emaj_group
      WHERE cast(to_number(substring(group_pg_version FROM E'^(\\d+)'),'99') * 100 +
                 to_number(substring(group_pg_version FROM E'^\\d+\\.(\\d+)'),'99') AS INTEGER) < 804;
    IF v_groupList IS NOT NULL THEN
      RAISE EXCEPTION 'E-Maj upgrade: groups "%" have been created with a too old postgres version (< 8.4). Drop these groups before upgrading. ',v_groupList;
    END IF;
  END;
$do$;

-- OK, the upgrade operation can start...

-- Insert the upgrade begin record in the operation history.
INSERT INTO emaj.emaj_hist (hist_function, hist_event, hist_object, hist_wording)
  VALUES ('EMAJ_INSTALL','BEGIN','E-Maj 4.1.0', 'Upgrade from 4.0.1 started');

-- Lock emaj_group table to avoid any concurrent E-Maj activity.
LOCK TABLE emaj.emaj_group IN EXCLUSIVE MODE;

-- Disable the event triggers during the upgrade operation.
SELECT emaj._disable_event_triggers();

----------------------------------------------
--                                          --
-- emaj enums, tables, views and sequences  --
--                                          --
----------------------------------------------


--
-- Add created or recreated tables and sequences to the list of content to save by pg_dump.
--

------------------------------------
--                                --
-- emaj types                     --
--                                --
------------------------------------

------------------------------------
--                                --
-- emaj functions                 --
--                                --
------------------------------------
-- Recreate functions that have been previously dropped in the tables structure upgrade step and will not be recreated later in this script.


--<begin_functions>                              pattern used by the tool that extracts and insert the functions definition
------------------------------------------------------------------
-- drop obsolete functions or functions with modified interface --
------------------------------------------------------------------

------------------------------------------------------------------
-- create new or modified functions                             --
------------------------------------------------------------------
CREATE OR REPLACE FUNCTION emaj._verify_groups(p_groups TEXT[], p_onErrorStop BOOLEAN)
RETURNS SETOF emaj._verify_groups_type LANGUAGE plpgsql AS
$_verify_groups$
-- The function verifies the consistency of a tables groups array.
-- Input: - tables groups array,
--        - a boolean indicating whether the function has to raise an exception in case of detected unconsistency.
-- If onErrorStop boolean is false, it returns a set of _verify_groups_type records, one row per detected unconsistency, including
-- the faulting schema and table or sequence names and a detailed message.
-- If no error is detected, no row is returned.
-- This function may be directly called by the Emaj_web client.
  DECLARE
    v_hint                   CONSTANT TEXT = 'You may use "SELECT * FROM emaj.emaj_verify_all()" to look for other issues.';
    r_object                 RECORD;
  BEGIN
-- Note that there is no check that the supplied groups exist. This has already been done by all calling functions.
-- Let's start with some global checks that always raise an exception if an issue is detected.
-- Check the postgres version: E-Maj needs postgres 9.5+.
    IF emaj._pg_version_num() < 90500 THEN
      RAISE EXCEPTION '_verify_groups: The current postgres version (%) is not compatible with this E-Maj version.'
                      ' It should be at least 9.5.', version();
    END IF;
-- OK, now look for groups unconsistency.
-- Unlike emaj_verify_all(), there is no direct check that application schemas exist.
-- Check that all application relations referenced in the emaj_relation table still exist.
    FOR r_object IN
      SELECT t.rel_schema, t.rel_tblseq, r.rel_group,
             'In group "' || r.rel_group || '", the ' ||
               CASE WHEN t.rel_kind = 'r' THEN 'table "' ELSE 'sequence "' END ||
               t.rel_schema || '"."' || t.rel_tblseq || '" does not exist any more.' AS msg
        FROM
          (  SELECT rel_schema, rel_tblseq, rel_kind
               FROM emaj.emaj_relation
               WHERE rel_group = ANY (p_groups)
                 AND upper_inf(rel_time_range)
           EXCEPT                                -- all relations known by postgres
             SELECT nspname, relname, relkind::TEXT
               FROM pg_catalog.pg_class
                    JOIN pg_catalog.pg_namespace ON (pg_namespace.oid = relnamespace)
               WHERE relkind IN ('r','S')
          ) AS t, emaj.emaj_relation r         -- join with emaj_relation to get the group name
        WHERE t.rel_schema = r.rel_schema
          AND t.rel_tblseq = r.rel_tblseq
          AND upper_inf(r.rel_time_range)
        ORDER BY 1,2,3
    LOOP
      IF p_onErrorStop THEN RAISE EXCEPTION '_verify_groups (1): % %',r_object.msg,v_hint; END IF;
      RETURN NEXT r_object;
    END LOOP;
-- Check that the log table for all tables referenced in the emaj_relation table still exist.
    FOR r_object IN
      SELECT rel_schema, rel_tblseq, rel_group,
             'In group "' || rel_group || '", the log table "' ||
               rel_log_schema || '"."' || rel_log_table || '" is not found.' AS msg
        FROM emaj.emaj_relation
        WHERE rel_group = ANY (p_groups)
          AND rel_kind = 'r'
          AND NOT EXISTS
                (SELECT NULL
                   FROM pg_catalog.pg_class
                        JOIN pg_catalog.pg_namespace ON (pg_namespace.oid = relnamespace)
                   WHERE nspname = rel_log_schema
                     AND relname = rel_log_table
                )
        ORDER BY 1,2,3
    LOOP
      IF p_onErrorStop THEN RAISE EXCEPTION '_verify_groups (2): % %',r_object.msg,v_hint; END IF;
      RETURN NEXT r_object;
    END LOOP;
-- Check that the log function for each table referenced in the emaj_relation table still exists.
    FOR r_object IN
                                                  -- the schema and table names are rebuilt from the returned function name
      SELECT rel_schema, rel_tblseq, rel_group,
             'In group "' || rel_group || '", the log function "' || rel_log_schema || '"."' || rel_log_function || '" is not found.'
               AS msg
        FROM emaj.emaj_relation
        WHERE rel_group = ANY (p_groups)
          AND rel_kind = 'r' AND upper_inf(rel_time_range)
          AND NOT EXISTS
                (SELECT NULL
                   FROM pg_catalog.pg_proc
                        JOIN pg_catalog.pg_namespace ON (pg_namespace.oid = pronamespace)
                   WHERE nspname = rel_log_schema
                     AND proname = rel_log_function
                )
        ORDER BY 1,2,3
    LOOP
      IF p_onErrorStop THEN RAISE EXCEPTION '_verify_groups (3): % %',r_object.msg,v_hint; END IF;
      RETURN NEXT r_object;
    END LOOP;
-- Check that log and truncate triggers for all tables referenced in the emaj_relation table still exist.
--   Start with the log trigger
    FOR r_object IN
      SELECT rel_schema, rel_tblseq, rel_group,
             'In group "' || rel_group || '", the log trigger "emaj_log_trg" on table "' ||
               rel_schema || '"."' || rel_tblseq || '" is not found.' AS msg
        FROM emaj.emaj_relation
        WHERE rel_group = ANY (p_groups)
          AND rel_kind = 'r'
          AND upper_inf(rel_time_range)
          AND NOT EXISTS
                (SELECT NULL
                   FROM pg_catalog.pg_trigger
                        JOIN pg_catalog.pg_class ON (pg_class.oid = tgrelid)
                        JOIN pg_catalog.pg_namespace ON (pg_namespace.oid = relnamespace)
                   WHERE nspname = rel_schema
                     AND relname = rel_tblseq
                     AND tgname = 'emaj_log_trg'
                )
        ORDER BY 1,2,3
    LOOP
      IF p_onErrorStop THEN RAISE EXCEPTION '_verify_groups (4): % %',r_object.msg,v_hint; END IF;
      RETURN NEXT r_object;
    END LOOP;
--   Then the truncate trigger.
    FOR r_object IN
      SELECT rel_schema, rel_tblseq, rel_group,
             'In group "' || rel_group || '", the truncate trigger "emaj_trunc_trg" on table "' ||
             rel_schema || '"."' || rel_tblseq || '" is not found.' AS msg
        FROM emaj.emaj_relation
        WHERE rel_group = ANY (p_groups)
          AND rel_kind = 'r'
          AND upper_inf(rel_time_range)
          AND NOT EXISTS
                (SELECT NULL
                   FROM pg_catalog.pg_trigger
                        JOIN pg_catalog.pg_class ON (pg_class.oid = tgrelid)
                        JOIN pg_catalog.pg_namespace ON (pg_namespace.oid = relnamespace)
                   WHERE nspname = rel_schema
                     AND relname = rel_tblseq
                     AND tgname = 'emaj_trunc_trg'
                )
      ORDER BY 1,2,3
    LOOP
      IF p_onErrorStop THEN RAISE EXCEPTION '_verify_groups (5): % %',r_object.msg,v_hint; END IF;
      RETURN NEXT r_object;
    END LOOP;
-- Check that all log tables have a structure consistent with the application tables they reference
-- (same columns and same formats). It only returns one row per faulting table.
    FOR r_object IN
      WITH cte_app_tables_columns AS                  -- application table's columns
        (SELECT rel_group, rel_schema, rel_tblseq, rel_log_schema, rel_log_table, attname, atttypid, attlen, atttypmod
           FROM emaj.emaj_relation
                JOIN pg_catalog.pg_class ON (relname = rel_tblseq)
                JOIN pg_catalog.pg_namespace ON (pg_namespace.oid = relnamespace AND nspname = rel_schema)
                JOIN pg_catalog.pg_attribute ON (attrelid = pg_class.oid)
           WHERE attnum > 0
             AND attisdropped = FALSE
             AND rel_group = ANY (p_groups)
             AND rel_kind = 'r'
             AND upper_inf(rel_time_range)
        ),
           cte_log_tables_columns AS                  -- log table's columns
        (SELECT rel_group, rel_schema, rel_tblseq, rel_log_schema, rel_log_table, attname, atttypid, attlen, atttypmod
           FROM emaj.emaj_relation
                JOIN pg_catalog.pg_class ON (relname = rel_log_table)
                JOIN pg_catalog.pg_namespace ON (pg_namespace.oid = relnamespace AND nspname = rel_log_schema)
                JOIN pg_catalog.pg_attribute ON (attrelid = pg_class.oid)
            WHERE attnum > 0
              AND NOT attisdropped
              AND attnum < rel_emaj_verb_attnum
              AND rel_group = ANY (p_groups)
              AND rel_kind = 'r'
              AND upper_inf(rel_time_range))
      SELECT DISTINCT rel_schema, rel_tblseq, rel_group,
             'In group "' || rel_group || '", the structure of the application table "' ||
               rel_schema || '"."' || rel_tblseq || '" is not coherent with its log table ("' ||
             rel_log_schema || '"."' || rel_log_table || '").' AS msg
        FROM
          (
            (                                        -- application table's columns
               SELECT rel_group, rel_schema, rel_tblseq, rel_log_schema, rel_log_table, attname, atttypid, attlen, atttypmod
                 FROM cte_app_tables_columns
             EXCEPT                                   -- minus log table's columns
               SELECT rel_group, rel_schema, rel_tblseq, rel_log_schema, rel_log_table, attname, atttypid, attlen, atttypmod
                 FROM cte_log_tables_columns
            )
          UNION
            (                                         -- log table's columns
               SELECT rel_group, rel_schema, rel_tblseq, rel_log_schema, rel_log_table, attname, atttypid, attlen, atttypmod
                 FROM cte_log_tables_columns
             EXCEPT                                    -- minus application table's columns
               SELECT rel_group, rel_schema, rel_tblseq, rel_log_schema, rel_log_table, attname, atttypid, attlen, atttypmod
                 FROM cte_app_tables_columns
            )
          ) AS t
        ORDER BY 1,2,3
    LOOP
      IF p_onErrorStop THEN RAISE EXCEPTION '_verify_groups (6): % %',r_object.msg,v_hint; END IF;
      RETURN NEXT r_object;
    END LOOP;
-- Check that all tables have their primary key if they belong to a rollbackable group.
    FOR r_object IN
      SELECT rel_schema, rel_tblseq, rel_group,
             'In rollbackable group "' || rel_group || '", the table "' ||
             rel_schema || '"."' || rel_tblseq || '" has no primary key any more.' AS msg
        FROM emaj.emaj_relation
             JOIN emaj.emaj_group ON (group_name = rel_group)
        WHERE rel_group = ANY (p_groups)
          AND rel_kind = 'r'
          AND upper_inf(rel_time_range)
          AND group_is_rollbackable
          AND NOT EXISTS
                (SELECT NULL
                   FROM pg_catalog.pg_class
                        JOIN pg_catalog.pg_namespace ON (pg_namespace.oid = relnamespace)
                        JOIN pg_catalog.pg_constraint ON (connamespace = pg_namespace.oid AND conrelid = pg_class.oid)
                   WHERE nspname = rel_schema
                     AND relname = rel_tblseq
                     AND contype = 'p'
                )
        ORDER BY 1,2,3
    LOOP
      IF p_onErrorStop THEN RAISE EXCEPTION '_verify_groups (7): % %',r_object.msg,v_hint; END IF;
      RETURN NEXT r_object;
    END LOOP;
-- For rollbackable groups, check that no table has been altered as UNLOGGED or dropped and recreated as TEMP table after the tables
-- groups creation.
    FOR r_object IN
      SELECT rel_schema, rel_tblseq, rel_group,
             'In rollbackable group "' || rel_group || '", the table "' ||
             rel_schema || '"."' || rel_tblseq || '" is UNLOGGED or TEMP.' AS msg
        FROM emaj.emaj_relation
             JOIN emaj.emaj_group ON (group_name = rel_group)
             JOIN pg_catalog.pg_class ON (relname = rel_tblseq)
             JOIN pg_catalog.pg_namespace ON (pg_namespace.oid = relnamespace AND nspname = rel_schema)
        WHERE rel_group = ANY (p_groups)
          AND rel_kind = 'r'
          AND upper_inf(rel_time_range)
          AND group_is_rollbackable
          AND relpersistence <> 'p'
        ORDER BY 1,2,3
    LOOP
      IF p_onErrorStop THEN RAISE EXCEPTION '_verify_groups (8): % %',r_object.msg,v_hint; END IF;
      RETURN NEXT r_object;
    END LOOP;
-- For rollbackable groups, with PG 11-, check that no table has been altered as WITH OIDS after tables groups creation.
    IF emaj._pg_version_num() < 120000 THEN
      FOR r_object IN
        SELECT rel_schema, rel_tblseq, rel_group,
               'In rollbackable group "' || rel_group || '", the table "' ||
               rel_schema || '"."' || rel_tblseq || '" is declared WITH OIDS.' AS msg
          FROM emaj.emaj_relation
               JOIN emaj.emaj_group ON (group_name = rel_group)
               JOIN pg_catalog.pg_class ON (relname = rel_tblseq)
               JOIN pg_catalog.pg_namespace ON (pg_namespace.oid = relnamespace AND nspname = rel_schema)
          WHERE rel_group = ANY (p_groups)
            AND rel_kind = 'r'
            AND upper_inf(rel_time_range)
            AND group_is_rollbackable
            AND relhasoids
          ORDER BY 1,2,3
      LOOP
        IF p_onErrorStop THEN RAISE EXCEPTION '_verify_groups (9): % %',r_object.msg,v_hint; END IF;
        RETURN NEXT r_object;
      END LOOP;
    END IF;
-- Check that the primary key structure of all tables belonging to rollbackable groups is unchanged.
    FOR r_object IN
      SELECT rel_schema, rel_tblseq, rel_group,
             'In rollbackable group "' || rel_group || '", the primary key of the table "' ||
             rel_schema || '"."' || rel_tblseq || '" has changed (' ||
             rel_sql_rlbk_pk_columns || ' => ' || current_pk_columns || ').' AS msg
        FROM
          (SELECT rel_schema, rel_tblseq, rel_group, rel_sql_rlbk_pk_columns,
                 string_agg(quote_ident(attname), ',' ORDER BY attnum) AS current_pk_columns
             FROM emaj.emaj_relation
                  JOIN emaj.emaj_group ON (group_name = rel_group)
                  JOIN pg_catalog.pg_class ON (relname = rel_tblseq)
                  JOIN pg_catalog.pg_namespace ON (pg_namespace.oid = relnamespace AND nspname = rel_schema)
                  JOIN pg_catalog.pg_index ON (indrelid = pg_class.oid)
                  JOIN pg_catalog.pg_attribute ON (pg_attribute.attrelid = pg_index.indrelid)
             WHERE rel_group = ANY (p_groups)
               AND rel_kind = 'r'
               AND upper_inf(rel_time_range)
               AND group_is_rollbackable
               AND attnum = ANY (indkey)
               AND indisprimary
               AND attnum > 0
               AND NOT attisdropped
             GROUP BY rel_schema, rel_tblseq, rel_group, rel_sql_rlbk_pk_columns
          ) AS t
        WHERE rel_sql_rlbk_pk_columns <> current_pk_columns
        ORDER BY 1,2,3
    LOOP
      IF p_onErrorStop THEN RAISE EXCEPTION '_verify_groups (10): % %',r_object.msg,v_hint; END IF;
      RETURN NEXT r_object;
    END LOOP;
-- Check that all log tables have the 6 required technical columns. It only returns one row per faulting table.
    FOR r_object IN
      SELECT DISTINCT rel_schema, rel_tblseq, rel_group,
             'In group "' || rel_group || '", the log table "' ||
             rel_log_schema || '"."' || rel_log_table || '" miss some technical columns (' ||
             string_agg(attname,', ') || ').' AS msg
        FROM
          (  SELECT rel_group, rel_schema, rel_tblseq, rel_log_schema, rel_log_table, attname
               FROM emaj.emaj_relation,
                   (VALUES ('emaj_verb'), ('emaj_tuple'), ('emaj_gid'), ('emaj_changed'), ('emaj_txid'), ('emaj_user')) AS t(attname)
               WHERE rel_group = ANY (p_groups)
                 AND rel_kind = 'r'
                 AND upper_inf(rel_time_range)
                 AND EXISTS
                       (SELECT NULL
                          FROM pg_catalog.pg_class
                               JOIN pg_catalog.pg_namespace ON (pg_namespace.oid = relnamespace)
                          WHERE nspname = rel_log_schema
                            AND relname = rel_log_table
                       )
           EXCEPT
             SELECT rel_group, rel_schema, rel_tblseq, rel_log_schema, rel_log_table, attname
               FROM emaj.emaj_relation
                    JOIN pg_catalog.pg_class ON (relname = rel_log_table)
                    JOIN pg_catalog.pg_namespace ON (pg_namespace.oid = relnamespace AND nspname = rel_log_schema)
                    JOIN pg_catalog.pg_attribute ON (attrelid = pg_class.oid)
               WHERE rel_group = ANY (p_groups)
                 AND rel_kind = 'r'
                 AND upper_inf(rel_time_range)
                 AND attnum > 0
                 AND attisdropped = FALSE
                 AND attname IN ('emaj_verb', 'emaj_tuple', 'emaj_gid', 'emaj_changed', 'emaj_txid', 'emaj_user')
          ) AS t2
        GROUP BY rel_group, rel_schema, rel_tblseq, rel_log_schema, rel_log_table
        ORDER BY 1,2,3
    LOOP
      IF p_onErrorStop THEN RAISE EXCEPTION '_verify_groups (11): % %',r_object.msg,v_hint; END IF;
      RETURN NEXT r_object;
    END LOOP;
--
    RETURN;
  END;
$_verify_groups$;

CREATE OR REPLACE FUNCTION emaj._estimate_rlbk_step_duration(p_step emaj._rlbk_step_enum, p_schema TEXT, p_table TEXT,
                                                             p_object TEXT, p_estimatedQuantity BIGINT,
                                                             p_defaultFixedCost INTERVAL, p_defaultVariableCost INTERVAL,
                                                             OUT p_estimateMethod INT, OUT p_estimatedDuration INTERVAL)
LANGUAGE plpgsql AS
$_estimate_rlbk_step_duration$
-- This function reads the rollback statistics in order to compute the duration estimate for elementary steps.
-- The function is called by _rlbk_planning().
-- The cost model depends on the step.
-- Input: step name, the schema, table and object names when it is relevant, the expected volume for the step,
--        the default fixed cost and the default variable cost from the emaj parameters
-- Output: the estimate method (1, 2 or 3), the duration estimate
  BEGIN
-- Initialize the output data.
    p_estimatedDuration = NULL;
-- Compute the duration estimate depending on the step.
    CASE
      WHEN p_step IN ('RLBK_TABLE', 'DELETE_LOG') THEN
-- For RLBK_TBL and DELETE_LOG, the estimate takes into account the estimated number of log rows to revert.
-- First look at the previous rollback durations for the table and with similar rollback volume (same order of magnitude).
        SELECT sum(rlbt_duration) * (p_estimatedQuantity::float / sum(rlbt_quantity)), 1
          INTO p_estimatedDuration, p_estimateMethod
          FROM emaj.emaj_rlbk_stat
          WHERE rlbt_step = p_step
            AND rlbt_quantity > 0
            AND rlbt_schema = p_schema
            AND rlbt_table = p_table
            AND rlbt_quantity / p_estimatedQuantity < 10
            AND p_estimatedQuantity / rlbt_quantity < 10;
        IF p_estimatedDuration IS NULL THEN
-- If there is no previous rollback operation with similar volume, take statistics for the table with all available volumes.
          SELECT sum(rlbt_duration) * (p_estimatedQuantity::float / sum(rlbt_quantity)), 2
            INTO p_estimatedDuration, p_estimateMethod
            FROM emaj.emaj_rlbk_stat
            WHERE rlbt_step = p_step
              AND rlbt_quantity > 0
              AND rlbt_schema = p_schema
              AND rlbt_table = p_table;
          IF p_estimatedDuration IS NULL THEN
-- No statistics found for the step, so use supplied E-Maj parameters.
            p_estimatedDuration = p_defaultVariableCost * p_estimatedQuantity + p_defaultFixedCost;
            p_estimateMethod = 3;
          END IF;
        END IF;
--
      WHEN p_step = 'ADD_FK' THEN
        IF p_estimatedQuantity = 0 THEN
-- Empty table (or table not yet analyzed).
          p_estimatedDuration = p_defaultFixedCost;
          p_estimateMethod = 3;
        ELSE
-- Non empty table and statistics (with at least one row) are available.
          SELECT sum(rlbt_duration) * (p_estimatedQuantity::float / sum(rlbt_quantity)), 1
            INTO p_estimatedDuration, p_estimateMethod
            FROM emaj.emaj_rlbk_stat
            WHERE rlbt_step = p_step
              AND rlbt_quantity > 0
              AND rlbt_schema = p_schema
              AND rlbt_table = p_table
              AND rlbt_object = p_object;
          IF p_estimatedDuration IS NULL THEN
-- Non empty table, but no statistic with at least one row is available => take the last duration for this fkey, if any.
            SELECT rlbt_duration, 2
              INTO p_estimatedDuration, p_estimateMethod
              FROM emaj.emaj_rlbk_stat
              WHERE rlbt_step = p_step
                AND rlbt_schema = p_schema
                AND rlbt_table = p_table
                AND rlbt_object = p_object
                AND rlbt_rlbk_id =
                      (SELECT max(rlbt_rlbk_id)
                         FROM emaj.emaj_rlbk_stat
                         WHERE rlbt_step = p_step
                           AND rlbt_schema = p_schema
                           AND rlbt_table = p_table
                           AND rlbt_object = p_object
                      );
            IF p_estimatedDuration IS NULL THEN
-- Definitely no statistics available, compute with the supplied default parameters.
              p_estimatedDuration = p_estimatedQuantity * p_defaultVariableCost + p_defaultFixedCost;
              p_estimateMethod = 3;
            END IF;
          END IF;
        END IF;
--
      WHEN p_step = 'SET_FK_IMM' THEN
-- If fkey checks statistics are available for this fkey, compute an average cost.
        SELECT sum(rlbt_duration) * (p_estimatedQuantity::float / sum(rlbt_quantity)), 2
          INTO p_estimatedDuration, p_estimateMethod
          FROM emaj.emaj_rlbk_stat
          WHERE rlbt_step = p_step
            AND rlbt_quantity > 0
            AND rlbt_schema = p_schema
            AND rlbt_table = p_table
            AND rlbt_object = p_object;
        IF p_estimatedDuration IS NULL THEN
-- No statistics are available for this fkey, so use the supplied E-Maj parameters.
          p_estimatedDuration = p_estimatedQuantity * p_defaultVariableCost + p_defaultFixedCost;
          p_estimateMethod = 3;
        END IF;
--
      ELSE
-- For other steps, there is no volume to consider.
-- Read statistics, if any, and compute an average cost.
        SELECT sum(rlbt_duration) / sum(rlbt_quantity), 2
          INTO p_estimatedDuration, p_estimateMethod
          FROM emaj.emaj_rlbk_stat
          WHERE rlbt_step = p_step;
        IF p_estimatedDuration IS NULL THEN
-- No statistics found for the step, so use the supplied E-Maj parameters.
          p_estimatedDuration = p_defaultFixedCost;
          p_estimateMethod = 3;
        END IF;
    END CASE;
--
    RETURN;
  END;
$_estimate_rlbk_step_duration$;

CREATE OR REPLACE FUNCTION emaj._verify_all_groups()
RETURNS SETOF TEXT LANGUAGE plpgsql AS
$_verify_all_groups$
-- The function verifies the consistency of all E-Maj groups.
-- It returns a set of error or warning messages for discovered discrepancies.
-- If no error is detected, no row is returned.
  BEGIN
--
-- Errors detection.
--
-- Check that the postgres version at groups creation time is compatible (i.e. >= 8.4).
    RETURN QUERY
      SELECT 'Error: The group "' || group_name || '" has been created with a non compatible postgresql version (' ||
               group_pg_version || '). It must be dropped and recreated.' AS msg
        FROM emaj.emaj_group
        WHERE cast(to_number(substring(group_pg_version FROM E'^(\\d+)'),'99') * 100 +
                   to_number(substring(group_pg_version FROM E'^\\d+\\.(\\d+)'),'99') AS INTEGER) < 804
        ORDER BY msg;
-- Check that all application schemas referenced in the emaj_relation table still exist.
    RETURN QUERY
      SELECT 'Error: The application schema "' || rel_schema || '" does not exist any more.' AS msg
        FROM
          (  SELECT DISTINCT rel_schema
               FROM emaj.emaj_relation
               WHERE upper_inf(rel_time_range)
           EXCEPT
              SELECT nspname
                FROM pg_catalog.pg_namespace
          ) AS t
        ORDER BY msg;
-- Check that all application relations referenced in the emaj_relation table still exist.
    RETURN QUERY
      SELECT 'Error: In the group "' || r.rel_group || '", the ' ||
               CASE WHEN t.rel_kind = 'r' THEN 'table "' ELSE 'sequence "' END ||
               t.rel_schema || '"."' || t.rel_tblseq || '" does not exist any more.' AS msg
        FROM                                          -- all expected application relations
          (  SELECT rel_schema, rel_tblseq, rel_kind
               FROM emaj.emaj_relation
               WHERE upper_inf(rel_time_range)
           EXCEPT                                    -- minus relations known by postgres
             SELECT nspname, relname, relkind::TEXT
               FROM pg_catalog.pg_class
                    JOIN pg_catalog.pg_namespace ON (pg_namespace.oid = relnamespace)
               WHERE relkind IN ('r','S')
          ) AS t
          JOIN emaj.emaj_relation r ON (t.rel_schema = r.rel_schema AND t.rel_tblseq = r.rel_tblseq AND upper_inf(r.rel_time_range))
        ORDER BY t.rel_schema, t.rel_tblseq, 1;
-- Check that the log table for all tables referenced in the emaj_relation table still exist.
    RETURN QUERY
      SELECT 'Error: In the group "' || rel_group || '", the log table "' ||
               rel_log_schema || '"."' || rel_log_table || '" is not found.' AS msg
        FROM emaj.emaj_relation
        WHERE rel_kind = 'r'
          AND NOT EXISTS
                (SELECT NULL
                   FROM pg_catalog.pg_class
                        JOIN pg_catalog.pg_namespace ON (pg_namespace.oid = relnamespace)
                   WHERE nspname = rel_log_schema
                     AND relname = rel_log_table
                )
        ORDER BY rel_schema, rel_tblseq, 1;
-- Check that the log sequence for all tables referenced in the emaj_relation table still exist.
    RETURN QUERY
      SELECT 'Error: In the group "' || rel_group || '", the log sequence "' ||
               rel_log_schema || '"."' || rel_log_sequence || '" is not found.' AS msg
        FROM emaj.emaj_relation
        WHERE upper_inf(rel_time_range)
          AND rel_kind = 'r'
          AND NOT EXISTS
                (SELECT NULL
                   FROM pg_catalog.pg_class
                        JOIN pg_catalog.pg_namespace ON (pg_namespace.oid = relnamespace)
                 WHERE nspname = rel_log_schema AND relname = rel_log_sequence
                )
        ORDER BY rel_schema, rel_tblseq, 1;
-- Check the log function for each table referenced in the emaj_relation table still exist.
    RETURN QUERY
      SELECT 'Error: In the group "' || rel_group || '", the log function "' ||
               rel_log_schema || '"."' || rel_log_function || '" is not found.'
             AS msg
        FROM emaj.emaj_relation
        WHERE upper_inf(rel_time_range)
          AND rel_kind = 'r'
          AND NOT EXISTS
                (SELECT NULL
                   FROM pg_catalog.pg_proc
                        JOIN pg_catalog.pg_namespace ON (pg_namespace.oid = pronamespace)
                 WHERE nspname = rel_log_schema
                   AND proname = rel_log_function
                )
        ORDER BY rel_schema, rel_tblseq, 1;
-- Check log and truncate triggers for all tables referenced in the emaj_relation table still exist.
-- Start with log triggers.
    RETURN QUERY
      SELECT 'Error: In the group "' || rel_group || '", the log trigger "emaj_log_trg" on table "' ||
               rel_schema || '"."' || rel_tblseq || '" is not found.' AS msg
        FROM emaj.emaj_relation
        WHERE upper_inf(rel_time_range)
          AND rel_kind = 'r'
          AND NOT EXISTS
                (SELECT NULL
                   FROM pg_catalog.pg_trigger
                        JOIN pg_catalog.pg_class ON (pg_class.oid = tgrelid)
                        JOIN pg_catalog.pg_namespace ON (pg_namespace.oid = relnamespace)
                   WHERE nspname = rel_schema
                     AND relname = rel_tblseq
                     AND tgname = 'emaj_log_trg'
                )
                       -- do not issue a row if the application table does not exist,
                       -- this case has been already detected
          AND EXISTS
                (SELECT NULL
                   FROM pg_catalog.pg_class
                        JOIN pg_catalog.pg_namespace ON (pg_namespace.oid = relnamespace)
                   WHERE nspname = rel_schema
                     AND relname = rel_tblseq
                )
        ORDER BY rel_schema, rel_tblseq, 1;
-- Then truncate triggers.
    RETURN QUERY
      SELECT 'Error: In the group "' || rel_group || '", the truncate trigger "emaj_trunc_trg" on table "' ||
             rel_schema || '"."' || rel_tblseq || '" is not found.' AS msg
        FROM emaj.emaj_relation
        WHERE upper_inf(rel_time_range)
          AND rel_kind = 'r'
          AND NOT EXISTS
                (SELECT NULL
                   FROM pg_catalog.pg_trigger
                        JOIN pg_catalog.pg_class ON (pg_class.oid = tgrelid)
                        JOIN pg_catalog.pg_namespace ON (pg_namespace.oid = relnamespace)
                   WHERE nspname = rel_schema
                     AND relname = rel_tblseq
                     AND tgname = 'emaj_trunc_trg'
                )
                       -- do not issue a row if the application table does not exist,
                       -- this case has been already detected
          AND EXISTS
                (SELECT NULL
                   FROM pg_catalog.pg_class
                        JOIN pg_catalog.pg_namespace ON (pg_namespace.oid = relnamespace)
                   WHERE nspname = rel_schema
                     AND relname = rel_tblseq
                )
        ORDER BY rel_schema, rel_tblseq, 1;
-- Check that all log tables have a structure consistent with the application tables they reference
-- (same columns and same formats). It only returns one row per faulting table.
    RETURN QUERY
      SELECT msg FROM
        (WITH cte_app_tables_columns AS                -- application table's columns
           (SELECT rel_group, rel_schema, rel_tblseq, rel_log_schema, rel_log_table, attname, atttypid, attlen, atttypmod
              FROM emaj.emaj_relation
                   JOIN pg_catalog.pg_class ON (relname = rel_tblseq)
                   JOIN pg_catalog.pg_namespace ON (pg_namespace.oid = relnamespace AND nspname = rel_schema)
                   JOIN pg_catalog.pg_attribute ON (attrelid = pg_class.oid)
              WHERE attnum > 0
                AND attisdropped = FALSE
                AND upper_inf(rel_time_range)
                AND rel_kind = 'r'
           ),
              cte_log_tables_columns AS                 -- log table's columns
           (SELECT rel_group, rel_schema, rel_tblseq, rel_log_schema, rel_log_table, attname, atttypid, attlen, atttypmod
              FROM emaj.emaj_relation
                   JOIN pg_catalog.pg_class ON (relname = rel_log_table)
                   JOIN pg_catalog.pg_namespace ON (pg_namespace.oid = relnamespace AND nspname = rel_log_schema)
                   JOIN pg_catalog.pg_attribute ON (attrelid = pg_class.oid)
              WHERE attnum > 0
                AND attisdropped = FALSE
                AND attnum < rel_emaj_verb_attnum
                AND upper_inf(rel_time_range)
                AND rel_kind = 'r'
           )
        SELECT DISTINCT rel_schema, rel_tblseq,
               'Error: In the group "' || rel_group || '", the structure of the application table "' ||
                 rel_schema || '"."' || rel_tblseq || '" is not coherent with its log table ("' ||
               rel_log_schema || '"."' || rel_log_table || '").' AS msg
          FROM
            (                                              -- application table's columns
              (  SELECT rel_group, rel_schema, rel_tblseq, rel_log_schema, rel_log_table, attname, atttypid, attlen, atttypmod
                   FROM cte_app_tables_columns
               EXCEPT                                      -- minus log table's columns
                 SELECT rel_group, rel_schema, rel_tblseq, rel_log_schema, rel_log_table, attname, atttypid, attlen, atttypmod
                   FROM cte_log_tables_columns
              )
            UNION                                          -- log table's columns
              (  SELECT rel_group, rel_schema, rel_tblseq, rel_log_schema, rel_log_table, attname, atttypid, attlen, atttypmod
                   FROM cte_log_tables_columns
               EXCEPT                                      --  minus application table's columns
                 SELECT rel_group, rel_schema, rel_tblseq, rel_log_schema, rel_log_table, attname, atttypid, attlen, atttypmod
                   FROM cte_app_tables_columns
              )
            ) AS t
                           -- do not issue a row if the log or application table does not exist,
                           -- these cases have been already detected
        WHERE (rel_log_schema, rel_log_table) IN
              (SELECT nspname, relname
                 FROM pg_catalog.pg_class
                      JOIN pg_catalog.pg_namespace ON (pg_namespace.oid = relnamespace)
              )
          AND (rel_schema, rel_tblseq) IN
              (SELECT nspname, relname
                 FROM pg_catalog.pg_class
                      JOIN pg_catalog.pg_namespace ON (pg_namespace.oid = relnamespace)
              )
        ORDER BY 1,2,3
        ) AS t;
-- Check that all tables of rollbackable groups have their primary key.
    RETURN QUERY
      SELECT 'Error: In the rollbackable group "' || rel_group || '", the table "' ||
             rel_schema || '"."' || rel_tblseq || '" has no primary key any more.' AS msg
        FROM emaj.emaj_relation
             JOIN emaj.emaj_group ON (group_name = rel_group)
        WHERE upper_inf(rel_time_range)
          AND rel_kind = 'r'
          AND group_is_rollbackable
          AND NOT EXISTS
                (SELECT NULL
                   FROM pg_catalog.pg_class
                        JOIN pg_catalog.pg_namespace ON (pg_namespace.oid = relnamespace)
                        JOIN pg_catalog.pg_constraint ON (connamespace = pg_namespace.oid AND conrelid = pg_class.oid)
                   WHERE nspname = rel_schema
                     AND relname = rel_tblseq
                     AND contype = 'p'
                )
                       -- do not issue a row if the application table does not exist,
                       -- this case has been already detected
          AND EXISTS
                (SELECT NULL
                   FROM pg_catalog.pg_class
                        JOIN pg_catalog.pg_namespace ON (pg_namespace.oid = relnamespace)
                   WHERE nspname = rel_schema
                     AND relname = rel_tblseq
                )
        ORDER BY rel_schema, rel_tblseq, 1;
-- For rollbackable groups, check that no table has been altered as UNLOGGED or dropped and recreated as TEMP table after
-- tables groups creation.
    RETURN QUERY
      SELECT 'Error: In the rollbackable group "' || rel_group || '", the table "' ||
             rel_schema || '"."' || rel_tblseq || '" is UNLOGGED or TEMP.' AS msg
        FROM emaj.emaj_relation
             JOIN emaj.emaj_group ON (group_name = rel_group)
             JOIN pg_catalog.pg_class ON (relname = rel_tblseq)
             JOIN pg_catalog.pg_namespace ON (pg_namespace.oid = relnamespace AND nspname = rel_schema)
        WHERE upper_inf(rel_time_range)
          AND rel_kind = 'r'
          AND group_is_rollbackable
          AND relpersistence <> 'p'
        ORDER BY rel_schema, rel_tblseq, 1;
-- With PG 11-, check that all tables are WITHOUT OIDS (i.e. have not been altered as WITH OIDS after their tables group creation).
    IF emaj._pg_version_num() < 120000 THEN
      RETURN QUERY
        SELECT 'Error: In the rollbackable group "' || rel_group || '", the table "' ||
               rel_schema || '"."' || rel_tblseq || '" is WITH OIDS.' AS msg
          FROM emaj.emaj_relation
               JOIN emaj.emaj_group ON (group_name = rel_group)
               JOIN pg_catalog.pg_class ON (relname = rel_tblseq)
               JOIN pg_catalog.pg_namespace ON (pg_namespace.oid = relnamespace AND nspname = rel_schema)
          WHERE upper_inf(rel_time_range)
            AND rel_kind = 'r'
            AND group_is_rollbackable
            AND relhasoids
          ORDER BY rel_schema, rel_tblseq, 1;
    END IF;
-- Check the primary key structure of all tables belonging to rollbackable groups is unchanged.
    RETURN QUERY
      SELECT 'Error: In the rollbackable group "' || rel_group || '", the primary key of the table "' ||
             rel_schema || '"."' || rel_tblseq || '" has changed (' ||
             rel_sql_rlbk_pk_columns || ' => ' || current_pk_columns || ').' AS msg
        FROM
          (SELECT rel_schema, rel_tblseq, rel_group, rel_sql_rlbk_pk_columns,
                 string_agg(quote_ident(attname), ',' ORDER BY attnum) AS current_pk_columns
             FROM emaj.emaj_relation
                  JOIN emaj.emaj_group ON (group_name = rel_group)
                  JOIN pg_catalog.pg_class ON (relname = rel_tblseq)
                  JOIN pg_catalog.pg_namespace ON (pg_namespace.oid = relnamespace AND nspname = rel_schema)
                  JOIN pg_catalog.pg_index ON (indrelid = pg_class.oid)
                  JOIN pg_catalog.pg_attribute ON (pg_attribute.attrelid = pg_index.indrelid)
             WHERE rel_kind = 'r'
               AND upper_inf(rel_time_range)
               AND group_is_rollbackable
               AND attnum = ANY (indkey)
               AND indisprimary
               AND attnum > 0
               AND attisdropped = FALSE
             GROUP BY rel_schema, rel_tblseq, rel_group, rel_sql_rlbk_pk_columns
          ) AS t
        WHERE rel_sql_rlbk_pk_columns <> current_pk_columns
        ORDER BY rel_schema, rel_tblseq, 1;
-- Check the array of triggers to ignore at rollback time only contains existing triggers.
    RETURN QUERY
      SELECT 'Error: In the rollbackable group "' || rel_group || '", the trigger "' || trg_name || '" for table "'
          || rel_schema || '"."' || rel_tblseq || '" is missing. '
          || 'Use the emaj_modify_table() function to adjust the list of application triggers that should not be'
          || ' automatically disabled at rollback time.'
             AS msg
        FROM
          (SELECT rel_group, rel_schema, rel_tblseq, unnest(rel_ignored_triggers) AS trg_name
             FROM emaj.emaj_relation
             WHERE upper_inf(rel_time_range)
               AND rel_ignored_triggers IS NOT NULL
          ) AS t
        WHERE NOT EXISTS
                 (SELECT NULL
                    FROM pg_catalog.pg_trigger
                         JOIN pg_catalog.pg_class ON (pg_class.oid = tgrelid)
                         JOIN pg_catalog.pg_namespace ON (pg_namespace.oid = relnamespace)
                    WHERE nspname = rel_schema
                      AND relname = rel_tblseq
                      AND tgname = trg_name
                 )
        ORDER BY rel_schema, rel_tblseq, 1;
-- Check all log tables have the 6 required technical columns.
    RETURN QUERY
      SELECT msg FROM
        (SELECT DISTINCT rel_schema, rel_tblseq,
                'Error: In the group "' || rel_group || '", the log table "' ||
                rel_log_schema || '"."' || rel_log_table || '" miss some technical columns (' ||
                string_agg(attname,', ') || ').' AS msg
           FROM
             (  SELECT rel_group, rel_schema, rel_tblseq, rel_log_schema, rel_log_table, attname
                  FROM emaj.emaj_relation,
                       (VALUES ('emaj_verb'), ('emaj_tuple'), ('emaj_gid'), ('emaj_changed'), ('emaj_txid'), ('emaj_user')) AS t(attname)
                  WHERE rel_kind = 'r'
                    AND upper_inf(rel_time_range)
                    AND EXISTS
                          (SELECT NULL
                             FROM pg_catalog.pg_namespace
                                  JOIN pg_catalog.pg_class ON (relnamespace = pg_namespace.oid)
                             WHERE nspname = rel_log_schema
                               AND relname = rel_log_table
                          )
              EXCEPT
                SELECT rel_group, rel_schema, rel_tblseq, rel_log_schema, rel_log_table, attname
                  FROM emaj.emaj_relation
                       JOIN pg_catalog.pg_class ON (relname = rel_log_table)
                       JOIN pg_catalog.pg_namespace ON (pg_namespace.oid = relnamespace AND nspname = rel_log_schema)
                       JOIN pg_catalog.pg_attribute ON (attrelid = pg_class.oid)
                  WHERE attnum > 0
                    AND attisdropped = FALSE
                    AND attname IN ('emaj_verb', 'emaj_tuple', 'emaj_gid', 'emaj_changed', 'emaj_txid', 'emaj_user')
                    AND rel_kind = 'r'
                    AND upper_inf(rel_time_range)
             ) AS t2
           GROUP BY rel_group, rel_schema, rel_tblseq, rel_log_schema, rel_log_table
           ORDER BY 1,2,3
         ) AS t;
--
-- Warnings detection.
--
-- Detect all sequences associated to a serial or a "generated as identity" column have their related table in the same group.
    RETURN QUERY
      SELECT msg FROM
        (WITH serial_dependencies AS
           (SELECT rs.rel_group AS seq_group, rs.rel_schema AS seq_schema, rs.rel_tblseq AS seq_name,
                   rt.rel_group AS tbl_group, nt.nspname AS tbl_schema, ct.relname AS tbl_name
              FROM emaj.emaj_relation rs
                   JOIN pg_catalog.pg_class cs ON (cs.relname = rel_tblseq)
                   JOIN pg_catalog.pg_namespace ns ON (ns.oid = cs.relnamespace AND ns.nspname = rel_schema)
                   JOIN pg_catalog.pg_depend ON (pg_depend.objid = cs.oid)
                   JOIN pg_catalog.pg_class ct ON (ct.oid = pg_depend.refobjid)
                   JOIN pg_catalog.pg_namespace nt ON (nt.oid = ct.relnamespace)
                   LEFT OUTER JOIN emaj.emaj_relation rt ON (rt.rel_schema = nt.nspname AND rt.rel_tblseq = ct.relname
                                                             AND (rt.rel_time_range IS NULL OR upper_inf(rt.rel_time_range)))
              WHERE rs.rel_kind = 'S'
                AND upper_inf(rs.rel_time_range)
                AND pg_depend.classid = pg_depend.refclassid             -- the classid et refclassid must be 'pg_class'
                AND pg_depend.classid =
                      (SELECT oid
                         FROM pg_catalog.pg_class
                         WHERE relname = 'pg_class'
                      )
           )
           SELECT DISTINCT seq_schema, seq_name,
                  'Warning: In the group "' || seq_group || '", the sequence "' || seq_schema || '"."' || seq_name ||
                  '" is linked to the table "' || tbl_schema || '"."' || tbl_name ||
                  '" but this table does not belong to any tables group.' AS msg
             FROM serial_dependencies
             WHERE tbl_group IS NULL
         UNION ALL
           SELECT DISTINCT seq_schema, seq_name,
                  'Warning: In the group "' || seq_group || '", the sequence "' || seq_schema || '"."' || seq_name ||
                  '" is linked to the table "' || tbl_schema || '"."' || tbl_name ||
                  '" but this table belongs to another tables group (' || tbl_group || ').' AS msg
             FROM serial_dependencies
             WHERE tbl_group <> seq_group
           ORDER BY 1,2,3
        ) AS t;
-- Detect tables linked by a foreign key but not belonging to the same tables group.
    RETURN QUERY
      SELECT msg FROM
        (WITH fk_dependencies AS             -- all foreign keys that link 2 tables at least one of both belongs to a tables group
           (SELECT n.nspname AS tbl_schema, t.relname AS tbl_name, c.conname, nf.nspname AS reftbl_schema, tf.relname AS reftbl_name,
                 r.rel_group AS tbl_group, g.group_is_rollbackable AS tbl_group_is_rollbackable,
                 rf.rel_group AS reftbl_group, gf.group_is_rollbackable AS reftbl_group_is_rollbackable
              FROM pg_catalog.pg_constraint c
                   JOIN pg_catalog.pg_class t      ON (t.oid = c.conrelid)
                   JOIN pg_catalog.pg_namespace n  ON (n.oid = t.relnamespace)
                   JOIN pg_catalog.pg_class tf     ON (tf.oid = c.confrelid)
                   JOIN pg_catalog.pg_namespace nf ON (nf.oid = tf.relnamespace)
                   LEFT OUTER JOIN emaj.emaj_relation r ON (r.rel_schema = n.nspname AND r.rel_tblseq = t.relname
                                                       AND upper_inf(r.rel_time_range))
                   LEFT OUTER JOIN emaj.emaj_group g ON (g.group_name = r.rel_group)
                   LEFT OUTER JOIN emaj.emaj_relation rf ON (rf.rel_schema = nf.nspname AND rf.rel_tblseq = tf.relname
                                                       AND upper_inf(rf.rel_time_range))
                   LEFT OUTER JOIN emaj.emaj_group gf ON (gf.group_name = rf.rel_group)
              WHERE contype = 'f'                                         -- FK constraints only
                AND (r.rel_group IS NOT NULL OR rf.rel_group IS NOT NULL) -- at least the table or the referenced table belongs to
                                                                          -- a tables group
                AND t.relkind = 'r'                                       -- only constraint linking true tables, ie. excluding
                AND tf.relkind = 'r'                                      --   partitionned tables
           )
           SELECT tbl_schema, tbl_name,
                  'Warning: In the group "' || tbl_group || '", the foreign key "' || conname ||
                  '" on the table "' || tbl_schema || '"."' || tbl_name ||
                  '" references the table "' || reftbl_schema || '"."' || reftbl_name || '" that does not belong to any group.' AS msg
             FROM fk_dependencies
             WHERE tbl_group IS NOT NULL
               AND tbl_group_is_rollbackable
               AND reftbl_group IS NULL
         UNION ALL
           SELECT tbl_schema, tbl_name,
                  'Warning: In the group "' || reftbl_group || '", the table "' || reftbl_schema || '"."' || reftbl_name ||
                  '" is referenced by the foreign key "' || conname ||
                  '" of the table "' || tbl_schema || '"."' || tbl_name || '" that does not belong to any group.' AS msg
             FROM fk_dependencies
             WHERE reftbl_group IS NOT NULL
               AND reftbl_group_is_rollbackable
               AND tbl_group IS NULL
        UNION ALL
          SELECT tbl_schema, tbl_name,
                 'Warning: In the group "' || tbl_group || '", the foreign key "' || conname ||
                 '" on the table "' || tbl_schema || '"."' || tbl_name ||
                 '" references the table "' || reftbl_schema || '"."' || reftbl_name || '" that belongs to another group ("' ||
                 reftbl_group || '")' AS msg
            FROM fk_dependencies
            WHERE tbl_group IS NOT NULL
              AND reftbl_group IS NOT NULL
              AND tbl_group <> reftbl_group
              AND (tbl_group_is_rollbackable OR reftbl_group_is_rollbackable)
          ORDER BY 1,2,3
        ) AS t;
--
    RETURN;
  END;
$_verify_all_groups$;

--<end_functions>                                pattern used by the tool that extracts and insert the functions definition
------------------------------------------
--                                      --
-- event triggers and related functions --
--                                      --
------------------------------------------

------------------------------------
--                                --
-- emaj roles and rights          --
--                                --
------------------------------------
REVOKE ALL ON ALL FUNCTIONS IN SCHEMA emaj FROM PUBLIC;

GRANT ALL ON ALL TABLES IN SCHEMA emaj TO emaj_adm;
GRANT ALL ON ALL SEQUENCES IN SCHEMA emaj TO emaj_adm;
GRANT EXECUTE ON ALL FUNCTIONS IN SCHEMA emaj TO emaj_adm;

GRANT SELECT ON ALL TABLES IN SCHEMA emaj TO emaj_viewer;
GRANT SELECT ON ALL SEQUENCES IN SCHEMA emaj TO emaj_viewer;
REVOKE SELECT ON TABLE emaj.emaj_param FROM emaj_viewer;


------------------------------------
--                                --
-- Complete the upgrade           --
--                                --
------------------------------------

-- Enable the event triggers.
DO
$tmp$
  DECLARE
    v_event_trigger_array    TEXT[];
  BEGIN
-- Build the event trigger names array from the pg_event_trigger table.
    SELECT coalesce(array_agg(evtname),ARRAY[]::TEXT[]) INTO v_event_trigger_array
      FROM pg_catalog.pg_event_trigger WHERE evtname LIKE 'emaj%' AND evtenabled = 'D';
-- Call the _enable_event_triggers() function.
    PERFORM emaj._enable_event_triggers(v_event_trigger_array);
  END;
$tmp$;

-- Set comments for all internal functions, by directly inserting a row in the pg_description table for all emaj functions
-- that do not have yet a recorded comment.
INSERT INTO pg_catalog.pg_description (objoid, classoid, objsubid, description)
  SELECT pg_proc.oid, pg_class.oid, 0 , 'E-Maj internal function'
    FROM pg_catalog.pg_proc, pg_catalog.pg_class
    WHERE pg_class.relname = 'pg_proc'
      AND pg_proc.oid IN               -- list all emaj functions that do not have yet a comment in pg_description
       (SELECT pg_proc.oid
          FROM pg_catalog.pg_proc
               JOIN pg_catalog.pg_namespace ON (pronamespace=pg_namespace.oid)
               LEFT OUTER JOIN pg_catalog.pg_description ON (pg_description.objoid = pg_proc.oid
                                     AND classoid = (SELECT oid FROM pg_catalog.pg_class WHERE relname = 'pg_proc')
                                     AND objsubid = 0)
          WHERE nspname = 'emaj' AND (proname LIKE E'emaj\\_%' OR proname LIKE E'\\_%')
            AND pg_description.description IS NULL
       );

-- Update the version id in the emaj_param table.
ALTER TABLE emaj.emaj_param DISABLE TRIGGER emaj_param_change_trg;
UPDATE emaj.emaj_param SET param_value_text = '4.1.0' WHERE param_key = 'emaj_version';
ALTER TABLE emaj.emaj_param ENABLE TRIGGER emaj_param_change_trg;

-- Insert the upgrade end record in the operation history.
INSERT INTO emaj.emaj_hist (hist_function, hist_event, hist_object, hist_wording)
  VALUES ('EMAJ_INSTALL','END','E-Maj 4.1.0', 'Upgrade from 4.0.1 completed');

-- Post installation checks.
DO
$tmp$
  DECLARE
  BEGIN
-- Check the max_prepared_transactions GUC value.
    IF current_setting('max_prepared_transactions')::int <= 1 THEN
      RAISE WARNING 'E-Maj upgrade: as the max_prepared_transactions parameter value (%) on this cluster is too low, no parallel rollback is possible.', current_setting('max_prepared_transactions');
    END IF;
  END;
$tmp$;

SET client_min_messages TO default;
