-- Bug fix: Make child table lookups more intelligent to be able to deal with schemas being in the current search_path. Functions this affects are: drop_time_partition(), drop_id_partition(), reapply_privileges(), undo_partition(), undo_partition_id(), undo_partition_time(). Before table names may not have matched properly when looping through all tables to drop or reset privileges. Thanks to https://github.com/terrorobe for reporting this issue.
-- Bug fix: reapply_privileges() had unconditional calls to pg_jobmon functions and would fail if it wasn't installed.
-- Added new parameter to drop partition functions to manually set an interval you'd like to drop. Makes it easier to cleanup a bunch of old partitions you don't need anymore without having to go through the whole retention policy setup if that's not needed.
-- Renamed drop_time_partition() to drop_partition_time() and drop_id_partition() to drop_partition_id() to be more consistent with the other function names. Please check function ownership & privileges before and after update to ensure they are reset properly.

DROP FUNCTION @extschema@.drop_time_partition(text, boolean, boolean);
DROP FUNCTION @extschema@.drop_id_partition(text, boolean, boolean); 

/*
 * Function to drop child tables from a time-based partition set. Options to drop indexes or actually drop the table from the database.
 */
CREATE FUNCTION drop_partition_time(p_parent_table text, p_retention interval DEFAULT NULL, p_keep_table boolean DEFAULT NULL, p_keep_index boolean DEFAULT NULL) RETURNS int
    LANGUAGE plpgsql SECURITY DEFINER
    AS $$
DECLARE

v_adv_lock                  boolean;
v_child_table               text;
v_datetime_string           text;
v_drop_count                int := 0;
v_index                     record;
v_job_id                    bigint;
v_jobmon_schema             text;
v_old_search_path           text;
v_part_interval             interval;
v_partition_timestamp       timestamp;
v_quarter                   text;
v_retention                 interval;
v_retention_keep_index      boolean;
v_retention_keep_table      boolean;
v_step_id                   bigint;
v_year                      text;

BEGIN

v_adv_lock := pg_try_advisory_lock(hashtext('pg_partman drop_partition_time'));
IF v_adv_lock = 'false' THEN
    RAISE NOTICE 'drop_partition_time already running.';
    RETURN 0;
END IF;

SELECT nspname INTO v_jobmon_schema FROM pg_namespace n, pg_extension e WHERE e.extname = 'pg_jobmon' AND e.extnamespace = n.oid;
IF v_jobmon_schema IS NOT NULL THEN
    SELECT current_setting('search_path') INTO v_old_search_path;
    EXECUTE 'SELECT set_config(''search_path'',''@extschema@,'||v_jobmon_schema||''',''false'')';
END IF;

-- Allow override of configuration options
IF p_retention IS NULL THEN
    SELECT  
        part_interval::interval
        , retention::interval
        , retention_keep_table
        , retention_keep_index
        , datetime_string
    INTO
        v_part_interval
        , v_retention
        , v_retention_keep_table
        , v_retention_keep_index
        , v_datetime_string
    FROM @extschema@.part_config 
    WHERE parent_table = p_parent_table 
    AND (type = 'time-static' OR type = 'time-dynamic') 
    AND retention IS NOT NULL;
    
    IF v_part_interval IS NULL THEN
        RAISE EXCEPTION 'Configuration for given parent table with a retention period not found: %', p_parent_table;
    END IF;
ELSE
    SELECT  
        part_interval::interval
        , retention_keep_table
        , retention_keep_index
        , datetime_string
    INTO
        v_part_interval
        , v_retention_keep_table
        , v_retention_keep_index
        , v_datetime_string
    FROM @extschema@.part_config 
    WHERE parent_table = p_parent_table 
    AND (type = 'time-static' OR type = 'time-dynamic'); 
    v_retention := p_retention;
    
    IF v_part_interval IS NULL THEN
        RAISE EXCEPTION 'Configuration for given parent table not found: %', p_parent_table;
    END IF;
END IF;

IF p_keep_table IS NOT NULL THEN
    v_retention_keep_table = p_keep_table;
END IF;
IF p_keep_index IS NOT NULL THEN
    v_retention_keep_index = p_keep_index;
END IF;

IF v_jobmon_schema IS NOT NULL THEN
    v_job_id := add_job('PARTMAN DROP TIME PARTITION: '|| p_parent_table);
END IF;

-- Loop through child tables of the given parent
FOR v_child_table IN 
    SELECT n.nspname||'.'||c.relname FROM pg_inherits i join pg_class c ON i.inhrelid = c.oid join pg_namespace n ON c.relnamespace = n.oid WHERE i.inhparent::regclass = p_parent_table::regclass ORDER BY i.inhrelid ASC
LOOP
    -- pull out datetime portion of last partition's tablename to make the next one
    IF v_part_interval != '3 months' THEN
        v_partition_timestamp := to_timestamp(substring(v_child_table from char_length(p_parent_table||'_p')+1), v_datetime_string);
    ELSE
        -- to_timestamp doesn't recognize 'Q' date string formater. Handle it
        v_year := split_part(substring(v_child_table from char_length(p_parent_table||'_p')+1), 'q', 1);
        v_quarter := split_part(substring(v_child_table from char_length(p_parent_table||'_p')+1), 'q', 2);
        CASE
            WHEN v_quarter = '1' THEN
                v_partition_timestamp := to_timestamp(v_year || '-01-01', 'YYYY-MM-DD');
            WHEN v_quarter = '2' THEN
                v_partition_timestamp := to_timestamp(v_year || '-04-01', 'YYYY-MM-DD');
            WHEN v_quarter = '3' THEN
                v_partition_timestamp := to_timestamp(v_year || '-07-01', 'YYYY-MM-DD');
            WHEN v_quarter = '4' THEN
                v_partition_timestamp := to_timestamp(v_year || '-10-01', 'YYYY-MM-DD');
        END CASE;
    END IF;

    -- Add one interval since partition names contain the start of the constraint period
    IF v_retention < (CURRENT_TIMESTAMP - (v_partition_timestamp + v_part_interval)) THEN
        IF v_jobmon_schema IS NOT NULL THEN
            v_step_id := add_step(v_job_id, 'Uninherit table '||v_child_table||' from '||p_parent_table);
        END IF;
        EXECUTE 'ALTER TABLE '||v_child_table||' NO INHERIT ' || p_parent_table;
        IF v_jobmon_schema IS NOT NULL THEN
            PERFORM update_step(v_step_id, 'OK', 'Done');
        END IF;
        IF v_retention_keep_table = false THEN
            IF v_jobmon_schema IS NOT NULL THEN
                v_step_id := add_step(v_job_id, 'Drop table '||v_child_table);
            END IF;
            EXECUTE 'DROP TABLE '||v_child_table;
            IF v_jobmon_schema IS NOT NULL THEN
                PERFORM update_step(v_step_id, 'OK', 'Done');
            END IF;
        ELSIF v_retention_keep_index = false THEN
            FOR v_index IN 
                SELECT i.indexrelid::regclass AS name
                , c.conname
                FROM pg_catalog.pg_index i
                LEFT JOIN pg_catalog.pg_constraint c ON i.indexrelid = c.conindid 
                WHERE i.indrelid = v_child_table::regclass
            LOOP
                IF v_jobmon_schema IS NOT NULL THEN
                    v_step_id := add_step(v_job_id, 'Drop index '||v_index.name||' from '||v_child_table);
                END IF;
                IF v_index.conname IS NOT NULL THEN
                    EXECUTE 'ALTER TABLE '||v_child_table||' DROP CONSTRAINT '||v_index.conname;
                ELSE
                    EXECUTE 'DROP INDEX '||v_index.name;
                END IF;
                IF v_jobmon_schema IS NOT NULL THEN
                    PERFORM update_step(v_step_id, 'OK', 'Done');
                END IF;
            END LOOP;
        END IF;
        v_drop_count := v_drop_count + 1;
    END IF; -- End retention check IF

END LOOP; -- End child table loop

IF v_jobmon_schema IS NOT NULL THEN
    v_step_id := add_step(v_job_id, 'Finished partition drop maintenance');
    PERFORM update_step(v_step_id, 'OK', v_drop_count||' partitions dropped.');
    PERFORM close_job(v_job_id);
    EXECUTE 'SELECT set_config(''search_path'','''||v_old_search_path||''',''false'')';
END IF;

PERFORM pg_advisory_unlock(hashtext('pg_partman drop_partition_time'));

RETURN v_drop_count;

EXCEPTION
    WHEN QUERY_CANCELED THEN
        PERFORM pg_advisory_unlock(hashtext('pg_partman drop_partition_time'));
        RAISE EXCEPTION '%', SQLERRM;
    WHEN OTHERS THEN
        IF v_jobmon_schema IS NOT NULL THEN
            EXECUTE 'SELECT set_config(''search_path'',''@extschema@,'||v_jobmon_schema||''',''false'')';
            IF v_job_id IS NULL THEN
                v_job_id := add_job('PARTMAN DROP TIME PARTITION');
                v_step_id := add_step(v_job_id, 'EXCEPTION before job logging started');
            END IF;
            IF v_step_id IS NULL THEN
                v_step_id := add_step(v_job_id, 'EXCEPTION before first step logged');
            END IF;
            PERFORM update_step(v_step_id, 'CRITICAL', 'ERROR: '||coalesce(SQLERRM,'unknown'));
            PERFORM fail_job(v_job_id);
            EXECUTE 'SELECT set_config(''search_path'','''||v_old_search_path||''',''false'')';
        END IF;
        PERFORM pg_advisory_unlock(hashtext('pg_partman drop_partition_time'));
        RAISE EXCEPTION '%', SQLERRM;
END
$$;


/*
 * Function to drop child tables from a time-based partition set. Options to drop indexes or actually drop the table from the database.
 */
CREATE FUNCTION drop_partition_id(p_parent_table text, p_retention bigint DEFAULT NULL, p_keep_table boolean DEFAULT NULL, p_keep_index boolean DEFAULT NULL) RETURNS int
    LANGUAGE plpgsql SECURITY DEFINER
    AS $$
DECLARE

v_adv_lock                  boolean;
v_child_table               text;
v_control                   text;
v_drop_count                int := 0;
v_index                     record;
v_job_id                    bigint;
v_jobmon_schema             text;
v_max                       bigint;
v_old_search_path           text;
v_part_interval             bigint;
v_partition_id              bigint;
v_retention                 bigint;
v_retention_keep_index      boolean;
v_retention_keep_table      boolean;
v_step_id                   bigint;

BEGIN

v_adv_lock := pg_try_advisory_lock(hashtext('pg_partman drop_partition_id'));
IF v_adv_lock = 'false' THEN
    RAISE NOTICE 'drop_partition_id already running.';
    RETURN 0;
END IF;

SELECT nspname INTO v_jobmon_schema FROM pg_namespace n, pg_extension e WHERE e.extname = 'pg_jobmon' AND e.extnamespace = n.oid;
IF v_jobmon_schema IS NOT NULL THEN
    SELECT current_setting('search_path') INTO v_old_search_path;
    EXECUTE 'SELECT set_config(''search_path'',''@extschema@,'||v_jobmon_schema||''',''false'')';
END IF;


-- Allow override of configuration options
IF p_retention IS NULL THEN
    SELECT  
        part_interval::bigint
        , control
        , retention::bigint
        , retention_keep_table
        , retention_keep_index
    INTO
        v_part_interval
        , v_control
        , v_retention
        , v_retention_keep_table
        , v_retention_keep_index
    FROM @extschema@.part_config 
    WHERE parent_table = p_parent_table 
    AND (type = 'id-static' OR type = 'id-dynamic') 
    AND retention IS NOT NULL;

    IF v_part_interval IS NULL THEN
        RAISE EXCEPTION 'Configuration for given parent table with a retention period not found: %', p_parent_table;
    END IF;
ELSE
     SELECT  
        part_interval::bigint
        , control
        , retention_keep_table
        , retention_keep_index
    INTO
        v_part_interval
        , v_control
        , v_retention_keep_table
        , v_retention_keep_index
    FROM @extschema@.part_config 
    WHERE parent_table = p_parent_table 
    AND (type = 'id-static' OR type = 'id-dynamic'); 
    v_retention := p_retention;

    IF v_part_interval IS NULL THEN
        RAISE EXCEPTION 'Configuration for given parent table not found: %', p_parent_table;
    END IF;
END IF;

IF p_keep_table IS NOT NULL THEN
    v_retention_keep_table = p_keep_table;
END IF;
IF p_keep_index IS NOT NULL THEN
    v_retention_keep_index = p_keep_index;
END IF;

IF v_jobmon_schema IS NOT NULL THEN
    v_job_id := add_job('PARTMAN DROP ID PARTITION: '|| p_parent_table);
END IF;

EXECUTE 'SELECT max('||v_control||') FROM '||p_parent_table INTO v_max;

-- Loop through child tables of the given parent
FOR v_child_table IN 
    SELECT n.nspname||'.'||c.relname FROM pg_inherits i join pg_class c ON i.inhrelid = c.oid join pg_namespace n ON c.relnamespace = n.oid WHERE i.inhparent::regclass = p_parent_table::regclass ORDER BY i.inhrelid ASC
LOOP
    v_partition_id := substring(v_child_table from char_length(p_parent_table||'_p')+1)::bigint;

    -- Add one interval since partition names contain the start of the constraint period
    IF v_retention <= (v_max - (v_partition_id + v_part_interval)) THEN
        IF v_jobmon_schema IS NOT NULL THEN
            v_step_id := add_step(v_job_id, 'Uninherit table '||v_child_table||' from '||p_parent_table);
        END IF;
        EXECUTE 'ALTER TABLE '||v_child_table||' NO INHERIT ' || p_parent_table;
        IF v_jobmon_schema IS NOT NULL THEN
            PERFORM update_step(v_step_id, 'OK', 'Done');
        END IF;
        IF v_retention_keep_table = false THEN
            IF v_jobmon_schema IS NOT NULL THEN
                v_step_id := add_step(v_job_id, 'Drop table '||v_child_table);
            END IF;
            EXECUTE 'DROP TABLE '||v_child_table;
            IF v_jobmon_schema IS NOT NULL THEN
                PERFORM update_step(v_step_id, 'OK', 'Done');
            END IF;
        ELSIF v_retention_keep_index = false THEN
            FOR v_index IN 
                SELECT i.indexrelid::regclass AS name
                , c.conname
                FROM pg_catalog.pg_index i
                LEFT JOIN pg_catalog.pg_constraint c ON i.indexrelid = c.conindid 
                WHERE i.indrelid = v_child_table::regclass
            LOOP
                IF v_jobmon_schema IS NOT NULL THEN
                    v_step_id := add_step(v_job_id, 'Drop index '||v_index.name||' from '||v_child_table);
                END IF;
                IF v_index.conname IS NOT NULL THEN
                    EXECUTE 'ALTER TABLE '||v_child_table||' DROP CONSTRAINT '||v_index.conname;
                ELSE
                    EXECUTE 'DROP INDEX '||v_index.name;
                END IF;
                IF v_jobmon_schema IS NOT NULL THEN
                    PERFORM update_step(v_step_id, 'OK', 'Done');
                END IF;
            END LOOP;
        END IF;
        v_drop_count := v_drop_count + 1;
    END IF; -- End retention check IF

END LOOP; -- End child table loop

IF v_jobmon_schema IS NOT NULL THEN
    v_step_id := add_step(v_job_id, 'Finished partition drop maintenance');
    PERFORM update_step(v_step_id, 'OK', v_drop_count||' partitions dropped.');
    PERFORM close_job(v_job_id);
    EXECUTE 'SELECT set_config(''search_path'','''||v_old_search_path||''',''false'')';
END IF;

PERFORM pg_advisory_unlock(hashtext('pg_partman drop_partition_id'));

RETURN v_drop_count;

EXCEPTION
    WHEN QUERY_CANCELED THEN
        PERFORM pg_advisory_unlock(hashtext('pg_partman drop_partition_id'));
        RAISE EXCEPTION '%', SQLERRM;
    WHEN OTHERS THEN
        IF v_jobmon_schema IS NOT NULL THEN
            EXECUTE 'SELECT set_config(''search_path'',''@extschema@,'||v_jobmon_schema||''',''false'')';
            IF v_job_id IS NULL THEN
                v_job_id := add_job('PARTMAN DROP ID PARTITION');
                v_step_id := add_step(v_job_id, 'EXCEPTION before job logging started');
            END IF;
            IF v_step_id IS NULL THEN
                v_step_id := add_step(v_job_id, 'EXCEPTION before first step logged');
            END IF;
            PERFORM update_step(v_step_id, 'CRITICAL', 'ERROR: '||coalesce(SQLERRM,'unknown'));
            PERFORM fail_job(v_job_id);
            EXECUTE 'SELECT set_config(''search_path'','''||v_old_search_path||''',''false'')';
        END IF;
        PERFORM pg_advisory_unlock(hashtext('pg_partman drop_partition_id'));
        RAISE EXCEPTION '%', SQLERRM;
END
$$;


/*
 * Function to re-apply ownership & privileges on all child tables in a partition set using parent table as reference
 */
CREATE OR REPLACE FUNCTION reapply_privileges(p_parent_table text) RETURNS void
    LANGUAGE plpgsql SECURITY DEFINER
    AS $$
DECLARE

v_all               text[] := ARRAY['SELECT', 'INSERT', 'UPDATE', 'DELETE', 'TRUNCATE', 'REFERENCES', 'TRIGGER'];
v_child_owner       text;
v_child_table       text;
v_child_grant       record;
v_count             int;
v_grant             text;
v_grantees          text[];
v_job_id            bigint;
v_jobmon_schema     text;
v_match             boolean;
v_old_search_path   text;
v_parent_owner      text;
v_owner_sql         text;
v_revoke            text[];
v_parent_grant      record;
v_sql               text;
v_step_id           bigint;

BEGIN

SELECT count(*) INTO v_count FROM @extschema@.part_config WHERE parent_table = p_parent_table;
IF v_count = 0 THEN
    RAISE EXCEPTION 'Given table is not managed by this extention: %', p_parent_table;
END IF;

SELECT nspname INTO v_jobmon_schema FROM pg_namespace n, pg_extension e WHERE e.extname = 'pg_jobmon' AND e.extnamespace = n.oid;
IF v_jobmon_schema IS NOT NULL THEN
    SELECT current_setting('search_path') INTO v_old_search_path;
    EXECUTE 'SELECT set_config(''search_path'',''@extschema@,'||v_jobmon_schema||''',''false'')';
END IF;

IF v_jobmon_schema IS NOT NULL THEN
    v_job_id := add_job('PARTMAN RE-APPLYING PRIVILEGES TO ALL CHILD TABLES OF: '||p_parent_table);
    v_step_id := add_step(v_job_id, 'Setting new child table privileges');
END IF;

SELECT tableowner INTO v_parent_owner FROM pg_tables WHERE schemaname ||'.'|| tablename = p_parent_table;

FOR v_child_table IN 
    SELECT n.nspname||'.'||c.relname FROM pg_inherits i join pg_class c ON i.inhrelid = c.oid join pg_namespace n ON c.relnamespace = n.oid WHERE i.inhparent::regclass = p_parent_table::regclass ORDER BY i.inhrelid ASC
LOOP
    IF v_jobmon_schema IS NOT NULL THEN
        PERFORM update_step(v_step_id, 'PENDING', 'Currently on child partition in ascending order: '||v_child_table);
    END IF;
    v_grantees := NULL;
    FOR v_parent_grant IN 
        SELECT array_agg(DISTINCT privilege_type::text ORDER BY privilege_type::text) AS types, grantee
        FROM information_schema.table_privileges 
        WHERE table_schema ||'.'|| table_name = p_parent_table
        GROUP BY grantee 
    LOOP
        -- Compare parent & child grants. Don't re-apply if it already exists
        v_match := false;
        FOR v_child_grant IN 
            SELECT array_agg(DISTINCT privilege_type::text ORDER BY privilege_type::text) AS types, grantee
            FROM information_schema.table_privileges 
            WHERE table_schema ||'.'|| table_name = v_child_table
            GROUP BY grantee 
        LOOP
            IF v_parent_grant.types = v_child_grant.types AND v_parent_grant.grantee = v_child_grant.grantee THEN
                v_match := true;
            END IF;
        END LOOP;

        IF v_match = false THEN
            EXECUTE 'GRANT '||array_to_string(v_parent_grant.types, ',')||' ON '||v_child_table||' TO '||v_parent_grant.grantee;
            SELECT array_agg(r) INTO v_revoke FROM (SELECT unnest(v_all) AS r EXCEPT SELECT unnest(v_parent_grant.types)) x;
            IF v_revoke IS NOT NULL THEN
                EXECUTE 'REVOKE '||array_to_string(v_revoke, ',')||' ON '||v_child_table||' FROM '||v_parent_grant.grantee||' CASCADE';
            END IF;
        END IF;

        v_grantees := array_append(v_grantees, v_parent_grant.grantee::text);

    END LOOP;
    
    -- Revoke all privileges from roles that have none on the parent
    IF v_grantees IS NOT NULL THEN
        SELECT array_agg(r) INTO v_revoke FROM (
            SELECT DISTINCT grantee::text AS r FROM information_schema.table_privileges WHERE table_schema ||'.'|| table_name = v_child_table
            EXCEPT
            SELECT unnest(v_grantees)) x;
        IF v_revoke IS NOT NULL THEN
            EXECUTE 'REVOKE ALL ON '||v_child_table||' FROM '||array_to_string(v_revoke, ',');
        END IF;
    END IF;

    SELECT tableowner INTO v_child_owner FROM pg_tables WHERE schemaname ||'.'|| tablename = v_child_table;
    IF v_parent_owner <> v_child_owner THEN
        EXECUTE 'ALTER TABLE '||v_child_table||' OWNER TO '||v_parent_owner;
    END IF;

END LOOP;

IF v_jobmon_schema IS NOT NULL THEN
    PERFORM update_step(v_step_id, 'OK', 'Done');
    PERFORM close_job(v_job_id);
END IF;

IF v_jobmon_schema IS NOT NULL THEN
    EXECUTE 'SELECT set_config(''search_path'','''||v_old_search_path||''',''false'')';
END IF;

EXCEPTION
    WHEN OTHERS THEN
        IF v_jobmon_schema IS NOT NULL THEN
            EXECUTE 'SELECT set_config(''search_path'',''@extschema@,'||v_jobmon_schema||''',''false'')';
            IF v_job_id IS NULL THEN
                v_job_id := add_job('PARTMAN CREATE TABLE: '||p_parent_table);
                v_step_id := add_step(v_job_id, 'Partition maintenance for table '||p_parent_table||' failed');
            ELSIF v_step_id IS NULL THEN
                v_step_id := add_step(v_job_id, 'EXCEPTION before first step logged');
            END IF;
            PERFORM update_step(v_step_id, 'BAD', 'ERROR: '||coalesce(SQLERRM,'unknown'));
            PERFORM fail_job(v_job_id);
            EXECUTE 'SELECT set_config(''search_path'','''||v_old_search_path||''',''false'')';
        END IF;
        RAISE EXCEPTION '%', SQLERRM;
END
$$;


/*
 * Function to undo partitioning. 
 * Will actually work on any parent/child table set, not just ones created by pg_partman.
 */
CREATE OR REPLACE FUNCTION undo_partition(p_parent_table text, p_batch_count int DEFAULT 1, p_keep_table boolean DEFAULT true) RETURNS bigint
    LANGUAGE plpgsql SECURITY DEFINER
    AS $$
DECLARE

v_adv_lock              boolean;
v_batch_loop_count      bigint := 0;
v_child_count           bigint;
v_child_table           text;
v_copy_sql              text;
v_job_id                bigint;
v_jobmon_schema         text;
v_old_search_path       text;
v_part_interval         interval;
v_rowcount              bigint;
v_step_id               bigint;
v_tablename             text;
v_total                 bigint := 0;
v_undo_count            int := 0;

BEGIN

v_adv_lock := pg_try_advisory_lock(hashtext('pg_partman undo_partition'));
IF v_adv_lock = 'false' THEN
    RAISE NOTICE 'undo_partition already running.';
    RETURN 0;
END IF;

SELECT nspname INTO v_jobmon_schema FROM pg_namespace n, pg_extension e WHERE e.extname = 'pg_jobmon' AND e.extnamespace = n.oid;
IF v_jobmon_schema IS NOT NULL THEN
    SELECT current_setting('search_path') INTO v_old_search_path;
    EXECUTE 'SELECT set_config(''search_path'',''@extschema@,'||v_jobmon_schema||''',''false'')';
END IF;

IF v_jobmon_schema IS NOT NULL THEN
    v_job_id := add_job('PARTMAN UNDO PARTITIONING: '||p_parent_table);
    v_step_id := add_step(v_job_id, 'Undoing partitioning for table '||p_parent_table);
END IF;

-- Stops new time partitons from being made as well as stopping child tables from being dropped if they were configured with a retention period.
UPDATE @extschema@.part_config SET undo_in_progress = true WHERE parent_table = p_parent_table;
-- Stop data going into child tables and stop new id partitions from being made.
v_tablename := substring(p_parent_table from position('.' in p_parent_table)+1);
EXECUTE 'DROP TRIGGER IF EXISTS '||v_tablename||'_part_trig ON '||p_parent_table;
EXECUTE 'DROP FUNCTION IF EXISTS '||p_parent_table||'_part_trig_func()';

IF v_jobmon_schema IS NOT NULL THEN
    PERFORM update_step(v_step_id, 'OK', 'Stopped partition creation process. Removed trigger & trigger function');
END IF;

WHILE v_batch_loop_count < p_batch_count LOOP 
    SELECT n.nspname||'.'||c.relname INTO v_child_table
    FROM pg_inherits i 
    JOIN pg_class c ON i.inhrelid = c.oid 
    JOIN pg_namespace n ON c.relnamespace = n.oid 
    WHERE i.inhparent::regclass = p_parent_table::regclass 
    ORDER BY i.inhrelid ASC;

    EXIT WHEN v_child_table IS NULL;

    EXECUTE 'SELECT count(*) FROM '||v_child_table INTO v_child_count;
    IF v_child_count = 0 THEN
        -- No rows left in this child table. Remove from partition set.
        EXECUTE 'ALTER TABLE '||v_child_table||' NO INHERIT ' || p_parent_table;
        IF p_keep_table = false THEN
            EXECUTE 'DROP TABLE '||v_child_table;
            IF v_jobmon_schema IS NOT NULL THEN
                PERFORM update_step(v_step_id, 'OK', 'Child table DROPPED. Moved '||coalesce(v_rowcount, 0)||' rows to parent');
            END IF;
        ELSE
            IF v_jobmon_schema IS NOT NULL THEN
                PERFORM update_step(v_step_id, 'OK', 'Child table UNINHERITED, not DROPPED. Copied '||coalesce(v_rowcount, 0)||' rows to parent');
            END IF;
        END IF;
        v_undo_count := v_undo_count + 1;
        CONTINUE;
    END IF;

    IF v_jobmon_schema IS NOT NULL THEN
        v_step_id := add_step(v_job_id, 'Removing child partition: '||v_child_table);
    END IF;
   
    v_copy_sql := 'INSERT INTO '||p_parent_table||' SELECT * FROM '||v_child_table;
    EXECUTE v_copy_sql;
    GET DIAGNOSTICS v_rowcount = ROW_COUNT;
    v_total := v_total + v_rowcount;

    EXECUTE 'ALTER TABLE '||v_child_table||' NO INHERIT ' || p_parent_table;
    IF p_keep_table = false THEN
        EXECUTE 'DROP TABLE '||v_child_table;
        IF v_jobmon_schema IS NOT NULL THEN
            PERFORM update_step(v_step_id, 'OK', 'Child table DROPPED. Moved '||v_rowcount||' rows to parent');
        END IF;
    ELSE
        IF v_jobmon_schema IS NOT NULL THEN
            PERFORM update_step(v_step_id, 'OK', 'Child table UNINHERITED, not DROPPED. Copied '||v_rowcount||' rows to parent');
        END IF;
    END IF;
    v_batch_loop_count := v_batch_loop_count + 1;
    v_undo_count := v_undo_count + 1;         
END LOOP;

IF v_undo_count = 0 THEN
    -- FOR loop never ran, so there's no child tables left.
    DELETE FROM @extschema@.part_config WHERE parent_table = p_parent_table;
    IF v_jobmon_schema IS NOT NULL THEN
        v_step_id := add_step(v_job_id, 'Removing config from pg_partman (if it existed)');
        PERFORM update_step(v_step_id, 'OK', 'Done');
    END IF;
END IF;

RAISE NOTICE 'Copied % row(s) from % child table(s) to the parent: %', v_total, v_undo_count, p_parent_table;
IF v_jobmon_schema IS NOT NULL THEN
    v_step_id := add_step(v_job_id, 'Final stats');
    PERFORM update_step(v_step_id, 'OK', 'Copied '||v_total||' row(s) from '||v_undo_count||' child table(s) to the parent');
END IF;

IF v_jobmon_schema IS NOT NULL THEN
    PERFORM close_job(v_job_id);
    EXECUTE 'SELECT set_config(''search_path'','''||v_old_search_path||''',''false'')';
END IF;

PERFORM pg_advisory_unlock(hashtext('pg_partman undo_partition'));

RETURN v_total;

EXCEPTION
    WHEN OTHERS THEN
        IF v_jobmon_schema IS NOT NULL THEN
            EXECUTE 'SELECT set_config(''search_path'',''@extschema@,'||v_jobmon_schema||''',''false'')';
            IF v_job_id IS NULL THEN
                v_job_id := add_job('PARTMAN UNDO PARTITIONING: '||p_parent_table);
                v_step_id := add_step(v_job_id, 'Partition function maintenance for table '||p_parent_table||' failed');
            ELSIF v_step_id IS NULL THEN
                v_step_id := add_step(v_job_id, 'EXCEPTION before first step logged');
            END IF;
            PERFORM update_step(v_step_id, 'CRITICAL', 'ERROR: '||coalesce(SQLERRM,'unknown'));
            PERFORM fail_job(v_job_id);
            EXECUTE 'SELECT set_config(''search_path'','''||v_old_search_path||''',''false'')';
        END IF;
        RAISE EXCEPTION '%', SQLERRM;
END
$$;


/*
 * Function to undo id-based partitioning created by this extension
 */
CREATE OR REPLACE FUNCTION undo_partition_id(p_parent_table text, p_batch_count int DEFAULT 1, p_batch_interval bigint DEFAULT NULL, p_keep_table boolean DEFAULT true) RETURNS bigint
    LANGUAGE plpgsql SECURITY DEFINER
    AS $$
DECLARE

v_adv_lock              boolean;
v_batch_loop_count      int := 0;
v_child_loop_total      bigint := 0;
v_child_min             bigint;
v_child_table           text;
v_control               text;
v_inner_loop_count      int;
v_job_id                bigint;
v_jobmon_schema         text;
v_move_sql              text;
v_old_search_path       text;
v_part_interval         bigint;
v_row                   record;
v_rowcount              bigint;
v_step_id               bigint;
v_tablename             text;
v_total                 bigint := 0;
v_undo_count            int := 0;

BEGIN

v_adv_lock := pg_try_advisory_lock(hashtext('pg_partman undo_id_partition'));
IF v_adv_lock = 'false' THEN
    RAISE NOTICE 'undo_id_partition already running.';
    RETURN 0;
END IF;

SELECT part_interval::bigint
    , control
INTO v_part_interval
    , v_control
FROM @extschema@.part_config 
WHERE parent_table = p_parent_table 
AND (type = 'id-static' OR type = 'id-dynamic');

IF v_part_interval IS NULL THEN
    RAISE EXCEPTION 'Configuration for given parent table not found: %', p_parent_table;
END IF;

SELECT nspname INTO v_jobmon_schema FROM pg_namespace n, pg_extension e WHERE e.extname = 'pg_jobmon' AND e.extnamespace = n.oid;
IF v_jobmon_schema IS NOT NULL THEN
    SELECT current_setting('search_path') INTO v_old_search_path;
    EXECUTE 'SELECT set_config(''search_path'',''@extschema@,'||v_jobmon_schema||''',''false'')';
END IF;

IF v_jobmon_schema IS NOT NULL THEN
    v_job_id := add_job('PARTMAN UNDO PARTITIONING: '||p_parent_table);
    v_step_id := add_step(v_job_id, 'Undoing partitioning for table '||p_parent_table);
END IF;

IF p_batch_interval IS NULL THEN
    p_batch_interval := v_part_interval;
END IF;

-- Stops new time partitons from being made as well as stopping child tables from being dropped if they were configured with a retention period.
UPDATE @extschema@.part_config SET undo_in_progress = true WHERE parent_table = p_parent_table;
-- Stop data going into child tables and stop new id partitions from being made.
v_tablename := substring(p_parent_table from position('.' in p_parent_table)+1);
EXECUTE 'DROP TRIGGER IF EXISTS '||v_tablename||'_part_trig ON '||p_parent_table;
EXECUTE 'DROP FUNCTION IF EXISTS '||p_parent_table||'_part_trig_func()';

IF v_jobmon_schema IS NOT NULL THEN
    PERFORM update_step(v_step_id, 'OK', 'Stopped partition creation process. Removed trigger & trigger function');
END IF;

<<outer_child_loop>>
WHILE v_batch_loop_count < p_batch_count LOOP 
    SELECT n.nspname||'.'||c.relname INTO v_child_table
    FROM pg_inherits i 
    JOIN pg_class c ON i.inhrelid = c.oid 
    JOIN pg_namespace n ON c.relnamespace = n.oid 
    WHERE i.inhparent::regclass = p_parent_table::regclass 
    ORDER BY i.inhrelid ASC;

    EXIT WHEN v_child_table IS NULL;

    IF v_jobmon_schema IS NOT NULL THEN
        v_step_id := add_step(v_job_id, 'Removing child partition: '||v_child_table);
    END IF;

    EXECUTE 'SELECT min('||v_control||') FROM '||v_child_table INTO v_child_min;
    IF v_child_min IS NULL THEN
        -- No rows left in this child table. Remove from partition set.
        EXECUTE 'ALTER TABLE '||v_child_table||' NO INHERIT ' || p_parent_table;
        IF p_keep_table = false THEN
            EXECUTE 'DROP TABLE '||v_child_table;
            IF v_jobmon_schema IS NOT NULL THEN
                PERFORM update_step(v_step_id, 'OK', 'Child table DROPPED. Moved '||v_child_loop_total||' rows to parent');
            END IF;
        ELSE
            IF v_jobmon_schema IS NOT NULL THEN
                PERFORM update_step(v_step_id, 'OK', 'Child table UNINHERITED, not DROPPED. Moved '||v_child_loop_total||' rows to parent');
            END IF;
        END IF;
        v_undo_count := v_undo_count + 1;
        CONTINUE outer_child_loop;
    END IF;
    v_inner_loop_count := 1;
    v_child_loop_total := 0;
    <<inner_child_loop>>
    LOOP
        -- Get everything from the current child minimum up to the multiples of the given interval
        v_move_sql := 'WITH move_data AS (DELETE FROM '||v_child_table||
                ' WHERE '||v_control||' <= '||quote_literal(v_child_min + (p_batch_interval * v_inner_loop_count))||' RETURNING *)
            INSERT INTO '||p_parent_table||' SELECT * FROM move_data';
        EXECUTE v_move_sql;
        GET DIAGNOSTICS v_rowcount = ROW_COUNT;
        v_total := v_total + v_rowcount;
        v_child_loop_total := v_child_loop_total + v_rowcount;
        IF v_jobmon_schema IS NOT NULL THEN
            PERFORM update_step(v_step_id, 'OK', 'Moved '||v_child_loop_total||' rows to parent.');
        END IF;
        EXIT inner_child_loop WHEN v_rowcount = 0; -- exit before loop incr if table is empty
        v_inner_loop_count := v_inner_loop_count + 1;
        v_batch_loop_count := v_batch_loop_count + 1;
        EXIT outer_child_loop WHEN v_batch_loop_count >= p_batch_count; -- Exit outer FOR loop if p_batch_count is reached
    END LOOP inner_child_loop;
END LOOP outer_child_loop;

IF v_batch_loop_count < p_batch_count THEN
    -- FOR loop never ran, so there's no child tables left.
    DELETE FROM @extschema@.part_config WHERE parent_table = p_parent_table;
    IF v_jobmon_schema IS NOT NULL THEN
        v_step_id := add_step(v_job_id, 'Removing config from pg_partman');
        PERFORM update_step(v_step_id, 'OK', 'Done');
    END IF;
END IF;

RAISE NOTICE 'Copied % row(s) to the parent. Removed % partitions.', v_total, v_undo_count;
IF v_jobmon_schema IS NOT NULL THEN
    v_step_id := add_step(v_job_id, 'Final stats');
    PERFORM update_step(v_step_id, 'OK', 'Copied '||v_total||' row(s) to the parent. Removed '||v_undo_count||' partitions.');
END IF;

IF v_jobmon_schema IS NOT NULL THEN
    PERFORM close_job(v_job_id);
    EXECUTE 'SELECT set_config(''search_path'','''||v_old_search_path||''',''false'')';
END IF;

PERFORM pg_advisory_unlock(hashtext('pg_partman undo_id_partition'));

RETURN v_total;

EXCEPTION
    WHEN OTHERS THEN
        IF v_jobmon_schema IS NOT NULL THEN
            EXECUTE 'SELECT set_config(''search_path'',''@extschema@,'||v_jobmon_schema||''',''false'')';
            IF v_job_id IS NULL THEN
                v_job_id := add_job('PARTMAN UNDO PARTITIONING: '||p_parent_table);
                v_step_id := add_step(v_job_id, 'Partition function maintenance for table '||p_parent_table||' failed');
            ELSIF v_step_id IS NULL THEN
                v_step_id := add_step(v_job_id, 'EXCEPTION before first step logged');
            END IF;
            PERFORM update_step(v_step_id, 'CRITICAL', 'ERROR: '||coalesce(SQLERRM,'unknown'));
            PERFORM fail_job(v_job_id);
            EXECUTE 'SELECT set_config(''search_path'','''||v_old_search_path||''',''false'')';
        END IF;
        RAISE EXCEPTION '%', SQLERRM;
END
$$;


/*
 * Function to undo time-based partitioning created by this extension
 */
CREATE OR REPLACE FUNCTION undo_partition_time(p_parent_table text, p_batch_count int DEFAULT 1, p_batch_interval interval DEFAULT NULL, p_keep_table boolean DEFAULT true) RETURNS bigint
    LANGUAGE plpgsql SECURITY DEFINER
    AS $$
DECLARE

v_adv_lock              boolean;
v_batch_loop_count      int := 0;
v_child_min             timestamptz;
v_child_loop_total      bigint := 0;
v_child_table           text;
v_control               text;
v_inner_loop_count      int;
v_job_id                bigint;
v_jobmon_schema         text;
v_move_sql              text;
v_old_search_path       text;
v_part_interval         interval;
v_row                   record;
v_rowcount              bigint;
v_step_id               bigint;
v_tablename             text;
v_total                 bigint := 0;
v_undo_count            int := 0;

BEGIN

v_adv_lock := pg_try_advisory_lock(hashtext('pg_partman undo_time_partition'));
IF v_adv_lock = 'false' THEN
    RAISE NOTICE 'undo_time_partition already running.';
    RETURN 0;
END IF;

SELECT part_interval::interval
    , control
INTO v_part_interval
    , v_control
FROM @extschema@.part_config 
WHERE parent_table = p_parent_table 
AND (type = 'time-static' OR type = 'time-dynamic');

IF v_part_interval IS NULL THEN
    RAISE EXCEPTION 'Configuration for given parent table not found: %', p_parent_table;
END IF;

SELECT nspname INTO v_jobmon_schema FROM pg_namespace n, pg_extension e WHERE e.extname = 'pg_jobmon' AND e.extnamespace = n.oid;
IF v_jobmon_schema IS NOT NULL THEN
    SELECT current_setting('search_path') INTO v_old_search_path;
    EXECUTE 'SELECT set_config(''search_path'',''@extschema@,'||v_jobmon_schema||''',''false'')';
END IF;

IF v_jobmon_schema IS NOT NULL THEN
    v_job_id := add_job('PARTMAN UNDO PARTITIONING: '||p_parent_table);
    v_step_id := add_step(v_job_id, 'Undoing partitioning for table '||p_parent_table);
END IF;

IF p_batch_interval IS NULL THEN
    p_batch_interval := v_part_interval;
END IF;

-- Stops new time partitons from being made as well as stopping child tables from being dropped if they were configured with a retention period.
UPDATE @extschema@.part_config SET undo_in_progress = true WHERE parent_table = p_parent_table;
-- Stop data going into child tables and stop new id partitions from being made.
v_tablename := substring(p_parent_table from position('.' in p_parent_table)+1);
EXECUTE 'DROP TRIGGER IF EXISTS '||v_tablename||'_part_trig ON '||p_parent_table;
EXECUTE 'DROP FUNCTION IF EXISTS '||p_parent_table||'_part_trig_func()';

IF v_jobmon_schema IS NOT NULL THEN
    PERFORM update_step(v_step_id, 'OK', 'Stopped partition creation process. Removed trigger & trigger function');
END IF;

<<outer_child_loop>>
WHILE v_batch_loop_count < p_batch_count LOOP 
    SELECT n.nspname||'.'||c.relname INTO v_child_table
    FROM pg_inherits i 
    JOIN pg_class c ON i.inhrelid = c.oid 
    JOIN pg_namespace n ON c.relnamespace = n.oid 
    WHERE i.inhparent::regclass = p_parent_table::regclass 
    ORDER BY i.inhrelid ASC;

    EXIT WHEN v_child_table IS NULL;

    IF v_jobmon_schema IS NOT NULL THEN
        v_step_id := add_step(v_job_id, 'Removing child partition: '||v_child_table);
    END IF;

    EXECUTE 'SELECT min('||v_control||') FROM '||v_child_table INTO v_child_min;
    IF v_child_min IS NULL THEN
        -- No rows left in this child table. Remove from partition set.
        EXECUTE 'ALTER TABLE '||v_child_table||' NO INHERIT ' || p_parent_table;
        IF p_keep_table = false THEN
            EXECUTE 'DROP TABLE '||v_child_table;
            IF v_jobmon_schema IS NOT NULL THEN
                PERFORM update_step(v_step_id, 'OK', 'Child table DROPPED. Moved '||v_child_loop_total||' rows to parent');
            END IF;
        ELSE
            IF v_jobmon_schema IS NOT NULL THEN
                PERFORM update_step(v_step_id, 'OK', 'Child table UNINHERITED, not DROPPED. Moved '||v_child_loop_total||' rows to parent');
            END IF;
        END IF;
        v_undo_count := v_undo_count + 1;
        CONTINUE outer_child_loop;
    END IF;
    v_inner_loop_count := 1;
    v_child_loop_total := 0;
    <<inner_child_loop>>
    LOOP
        -- Get everything from the current child minimum up to the multiples of the given interval
        v_move_sql := 'WITH move_data AS (DELETE FROM '||v_child_table||
                ' WHERE '||v_control||' <= '||quote_literal(v_child_min + (p_batch_interval * v_inner_loop_count))||' RETURNING *)
            INSERT INTO '||p_parent_table||' SELECT * FROM move_data';
        EXECUTE v_move_sql;
        GET DIAGNOSTICS v_rowcount = ROW_COUNT;
        v_total := v_total + v_rowcount;
        v_child_loop_total := v_child_loop_total + v_rowcount;
        IF v_jobmon_schema IS NOT NULL THEN
            PERFORM update_step(v_step_id, 'OK', 'Moved '||v_child_loop_total||' rows to parent.');
        END IF;
        EXIT inner_child_loop WHEN v_rowcount = 0; -- exit before loop incr if table is empty
        v_inner_loop_count := v_inner_loop_count + 1;
        v_batch_loop_count := v_batch_loop_count + 1;
        EXIT outer_child_loop WHEN v_batch_loop_count >= p_batch_count; -- Exit outer FOR loop if p_batch_count is reached
    END LOOP inner_child_loop;
END LOOP outer_child_loop;

IF v_batch_loop_count < p_batch_count THEN
    -- FOR loop never ran, so there's no child tables left.
    DELETE FROM @extschema@.part_config WHERE parent_table = p_parent_table;
    IF v_jobmon_schema IS NOT NULL THEN
        v_step_id := add_step(v_job_id, 'Removing config from pg_partman');
        PERFORM update_step(v_step_id, 'OK', 'Done');
    END IF;
END IF;

RAISE NOTICE 'Copied % row(s) to the parent. Removed % partitions.', v_total, v_undo_count;
IF v_jobmon_schema IS NOT NULL THEN
    v_step_id := add_step(v_job_id, 'Final stats');
    PERFORM update_step(v_step_id, 'OK', 'Copied '||v_total||' row(s) to the parent. Removed '||v_undo_count||' partitions.');
END IF;

IF v_jobmon_schema IS NOT NULL THEN
    PERFORM close_job(v_job_id);
    EXECUTE 'SELECT set_config(''search_path'','''||v_old_search_path||''',''false'')';
END IF;

PERFORM pg_advisory_unlock(hashtext('pg_partman undo_time_partition'));

RETURN v_total;

EXCEPTION
    WHEN OTHERS THEN
        IF v_jobmon_schema IS NOT NULL THEN
            EXECUTE 'SELECT set_config(''search_path'',''@extschema@,'||v_jobmon_schema||''',''false'')';
            IF v_job_id IS NULL THEN
                v_job_id := add_job('PARTMAN UNDO PARTITIONING: '||p_parent_table);
                v_step_id := add_step(v_job_id, 'Partition function maintenance for table '||p_parent_table||' failed');
            ELSIF v_step_id IS NULL THEN
                v_step_id := add_step(v_job_id, 'EXCEPTION before first step logged');
            END IF;
            PERFORM update_step(v_step_id, 'CRITICAL', 'ERROR: '||coalesce(SQLERRM,'unknown'));
            PERFORM fail_job(v_job_id);
            EXECUTE 'SELECT set_config(''search_path'','''||v_old_search_path||''',''false'')';
        END IF;
        RAISE EXCEPTION '%', SQLERRM;
END
$$;


/*
 * Function to manage pre-creation of the next partitions in a time-based partition set.
 * Also manages dropping old partitions if the retention option is set.
 */
CREATE OR REPLACE FUNCTION run_maintenance() RETURNS void 
    LANGUAGE plpgsql SECURITY DEFINER
    AS $$
DECLARE

v_adv_lock                      boolean;
v_create_count                  int := 0;
v_current_partition_timestamp   timestamp;
v_datetime_string               text;
v_drop_count                    int := 0;
v_job_id                        bigint;
v_jobmon_schema                 text;
v_last_partition_timestamp      timestamp;
v_old_search_path               text;
v_premade_count                 real;
v_quarter                       text;
v_step_id                       bigint;
v_row                           record;
v_year                          text;

BEGIN

v_adv_lock := pg_try_advisory_lock(hashtext('pg_partman run_maintenance'));
IF v_adv_lock = 'false' THEN
    RAISE NOTICE 'Partman maintenance already running.';
    RETURN;
END IF;

SELECT nspname INTO v_jobmon_schema FROM pg_namespace n, pg_extension e WHERE e.extname = 'pg_jobmon' AND e.extnamespace = n.oid;
IF v_jobmon_schema IS NOT NULL THEN
    SELECT current_setting('search_path') INTO v_old_search_path;
    EXECUTE 'SELECT set_config(''search_path'',''@extschema@,'||v_jobmon_schema||''',''false'')';
END IF;

IF v_jobmon_schema IS NOT NULL THEN
    v_job_id := add_job('PARTMAN RUN MAINTENANCE');
    v_step_id := add_step(v_job_id, 'Running maintenance loop');
END IF;

FOR v_row IN 
SELECT parent_table
    , type
    , part_interval::interval
    , control
    , premake
    , datetime_string
    , last_partition
    , undo_in_progress
FROM @extschema@.part_config WHERE type = 'time-static' OR type = 'time-dynamic'
LOOP

    CONTINUE WHEN v_row.undo_in_progress;
    
    CASE
        WHEN v_row.part_interval = '15 mins' THEN
            v_current_partition_timestamp := date_trunc('hour', CURRENT_TIMESTAMP) + 
                '15min'::interval * floor(date_part('minute', CURRENT_TIMESTAMP) / 15.0);
        WHEN v_row.part_interval = '30 mins' THEN
            v_current_partition_timestamp := date_trunc('hour', CURRENT_TIMESTAMP) + 
                '30min'::interval * floor(date_part('minute', CURRENT_TIMESTAMP) / 30.0);
        WHEN v_row.part_interval = '1 hour' THEN
            v_current_partition_timestamp := date_trunc('hour', CURRENT_TIMESTAMP);
         WHEN v_row.part_interval = '1 day' THEN
            v_current_partition_timestamp := date_trunc('day', CURRENT_TIMESTAMP);
        WHEN v_row.part_interval = '1 week' THEN
            v_current_partition_timestamp := date_trunc('week', CURRENT_TIMESTAMP);
        WHEN v_row.part_interval = '1 month' THEN
            v_current_partition_timestamp := date_trunc('month', CURRENT_TIMESTAMP);
        WHEN v_row.part_interval = '3 months' THEN
            v_current_partition_timestamp := date_trunc('quarter', CURRENT_TIMESTAMP);
        WHEN v_row.part_interval = '1 year' THEN
            v_current_partition_timestamp := date_trunc('year', CURRENT_TIMESTAMP);
    END CASE;

    IF v_row.part_interval != '3 months' THEN
        v_last_partition_timestamp := to_timestamp(substring(v_row.last_partition from char_length(v_row.parent_table||'_p')+1), v_row.datetime_string);
    ELSE
        -- to_timestamp doesn't recognize 'Q' date string formater. Handle it
        v_year := split_part(substring(v_row.last_partition from char_length(v_row.parent_table||'_p')+1), 'q', 1);
        v_quarter := split_part(substring(v_row.last_partition from char_length(v_row.parent_table||'_p')+1), 'q', 2);
        CASE
            WHEN v_quarter = '1' THEN
                v_last_partition_timestamp := to_timestamp(v_year || '-01-01', 'YYYY-MM-DD');
            WHEN v_quarter = '2' THEN
                v_last_partition_timestamp := to_timestamp(v_year || '-04-01', 'YYYY-MM-DD');
            WHEN v_quarter = '3' THEN
                v_last_partition_timestamp := to_timestamp(v_year || '-07-01', 'YYYY-MM-DD');
            WHEN v_quarter = '4' THEN
                v_last_partition_timestamp := to_timestamp(v_year || '-10-01', 'YYYY-MM-DD');
        END CASE;
    END IF;

    -- Check and see how many premade partitions there are. If it's less than premake in config table, make another
    v_premade_count = EXTRACT('epoch' FROM age(v_last_partition_timestamp, v_current_partition_timestamp)) / EXTRACT('epoch' FROM v_row.part_interval::interval);

    -- Loop premaking until config setting is met. Allows it to catch up if it fell behind or if premake changed.
    WHILE v_premade_count < v_row.premake LOOP
        EXECUTE 'SELECT @extschema@.create_next_time_partition('||quote_literal(v_row.parent_table)||')';
        v_create_count := v_create_count + 1;
        IF v_row.type = 'time-static' THEN
            EXECUTE 'SELECT @extschema@.create_time_function('||quote_literal(v_row.parent_table)||')';
        END IF;
        v_last_partition_timestamp := v_last_partition_timestamp + v_row.part_interval;
        v_premade_count = EXTRACT('epoch' FROM age(v_last_partition_timestamp, v_current_partition_timestamp)) / EXTRACT('epoch' FROM v_row.part_interval::interval);
    END LOOP;

END LOOP; -- end of creation loop

-- Manage dropping old partitions if retention option is set
FOR v_row IN 
    SELECT parent_table FROM @extschema@.part_config WHERE retention IS NOT NULL AND undo_in_progress = false AND (type = 'time-static' OR type = 'time-dynamic')
LOOP
    v_drop_count := v_drop_count + @extschema@.drop_partition_time(v_row.parent_table);   
END LOOP; 
FOR v_row IN 
    SELECT parent_table FROM @extschema@.part_config WHERE retention IS NOT NULL AND undo_in_progress = false AND (type = 'id-static' OR type = 'id-dynamic')
LOOP
    v_drop_count := v_drop_count + @extschema@.drop_partition_id(v_row.parent_table);
END LOOP; 

IF v_jobmon_schema IS NOT NULL THEN
    PERFORM update_step(v_step_id, 'OK', 'Partition maintenance finished. '||v_create_count||' partitons made. '||v_drop_count||' partitions dropped.');
    PERFORM close_job(v_job_id);
    EXECUTE 'SELECT set_config(''search_path'','''||v_old_search_path||''',''false'')';
END IF;

PERFORM pg_advisory_unlock(hashtext('pg_partman run_maintenance'));

EXCEPTION
    WHEN QUERY_CANCELED THEN
        PERFORM pg_advisory_unlock(hashtext('pg_partman run_maintenance'));
        RAISE EXCEPTION '%', SQLERRM;
    WHEN OTHERS THEN
        IF v_jobmon_schema IS NOT NULL THEN
            EXECUTE 'SELECT set_config(''search_path'',''@extschema@,'||v_jobmon_schema||''',''false'')';
            IF v_job_id IS NULL THEN
                v_job_id := add_job('PARTMAN RUN MAINTENANCE');
                v_step_id := add_step(v_job_id, 'EXCEPTION before job logging started');
            END IF;
            IF v_step_id IS NULL THEN
                v_step_id := add_step(v_job_id, 'EXCEPTION before first step logged');
            END IF;
            PERFORM update_step(v_step_id, 'CRITICAL', 'ERROR: '||coalesce(SQLERRM,'unknown'));
            PERFORM fail_job(v_job_id);
            EXECUTE 'SELECT set_config(''search_path'','''||v_old_search_path||''',''false'')';
        END IF;
        PERFORM pg_advisory_unlock(hashtext('pg_partman run_maintenance'));
        RAISE EXCEPTION '%', SQLERRM;
END
$$;
