/* * Function to create a child table in a time-based partition set */ CREATE FUNCTION create_time_partition (p_parent_table text, p_control text, p_interval interval, p_datetime_string text, p_partition_times timestamp[]) RETURNS text LANGUAGE plpgsql SECURITY DEFINER AS $$ DECLARE v_job_id bigint; v_jobmon_schema text; v_old_search_path text; v_partition_name text; v_partition_timestamp_end timestamp; v_partition_timestamp_start timestamp; v_quarter text; v_step_id bigint; v_tablename text; v_time timestamp; v_year text; BEGIN 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; FOREACH v_time IN ARRAY p_partition_times LOOP v_partition_name := p_parent_table || '_p'; IF p_interval = '1 year' OR p_interval = '1 month' OR p_interval = '1 day' OR p_interval = '1 hour' OR p_interval = '30 mins' OR p_interval = '15 mins' THEN v_partition_name := v_partition_name || to_char(v_time, 'YYYY'); IF p_interval = '1 month' OR p_interval = '1 day' OR p_interval = '1 hour' OR p_interval = '30 mins' OR p_interval = '15 mins' THEN v_partition_name := v_partition_name || '_' || to_char(v_time, 'MM'); IF p_interval = '1 day' OR p_interval = '1 hour' OR p_interval = '30 mins' OR p_interval = '15 mins' THEN v_partition_name := v_partition_name || '_' || to_char(v_time, 'DD'); IF p_interval = '1 hour' OR p_interval = '30 mins' OR p_interval = '15 mins' THEN v_partition_name := v_partition_name || '_' || to_char(v_time, 'HH24'); IF p_interval <> '30 mins' AND p_interval <> '15 mins' THEN v_partition_name := v_partition_name || '00'; ELSIF p_interval = '15 mins' THEN IF date_part('minute', v_time) < 15 THEN v_partition_name := v_partition_name || '00'; ELSIF date_part('minute', v_time) >= 15 AND date_part('minute', v_time) < 30 THEN v_partition_name := v_partition_name || '15'; ELSIF date_part('minute', v_time) >= 30 AND date_part('minute', v_time) < 45 THEN v_partition_name := v_partition_name || '30'; ELSE v_partition_name := v_partition_name || '45'; END IF; ELSIF p_interval = '30 mins' THEN IF date_part('minute', v_time) < 30 THEN v_partition_name := v_partition_name || '00'; ELSE v_partition_name := v_partition_name || '30'; END IF; END IF; END IF; -- end hour IF END IF; -- end day IF END IF; -- end month IF ELSIF p_interval = '1 week' THEN v_partition_name := v_partition_name || to_char(v_time, 'IYYY') || 'w' || to_char(v_time, 'IW'); END IF; -- end year/week IF -- pull out datetime portion of last partition's tablename v_partition_timestamp_start := to_timestamp(substring(v_partition_name from char_length(p_parent_table||'_p')+1), p_datetime_string); v_partition_timestamp_end := to_timestamp(substring(v_partition_name from char_length(p_parent_table||'_p')+1), p_datetime_string) + p_interval; -- "Q" is ignored in to_timestamp, so handle special case IF p_interval = '3 months' THEN v_year := to_char(v_time, 'YYYY'); v_quarter := to_char(v_time, 'Q'); v_partition_name := v_partition_name || v_year || 'q' || v_quarter; CASE WHEN v_quarter = '1' THEN v_partition_timestamp_start := to_timestamp(v_year || '-01-01', 'YYYY-MM-DD'); WHEN v_quarter = '2' THEN v_partition_timestamp_start := to_timestamp(v_year || '-04-01', 'YYYY-MM-DD'); WHEN v_quarter = '3' THEN v_partition_timestamp_start := to_timestamp(v_year || '-07-01', 'YYYY-MM-DD'); WHEN v_quarter = '4' THEN v_partition_timestamp_start := to_timestamp(v_year || '-10-01', 'YYYY-MM-DD'); END CASE; v_partition_timestamp_end := v_partition_timestamp_start + p_interval; END IF; SELECT schemaname ||'.'|| tablename INTO v_tablename FROM pg_catalog.pg_tables WHERE schemaname ||'.'|| tablename = v_partition_name; IF v_tablename IS NOT NULL THEN CONTINUE; END IF; IF v_jobmon_schema IS NOT NULL THEN v_job_id := add_job('PARTMAN CREATE TABLE: '||p_parent_table); v_step_id := add_step(v_job_id, 'Creating new partition '||v_partition_name||' with interval from '||v_partition_timestamp_start||' to '||(v_partition_timestamp_end-'1sec'::interval)); END IF; IF position('.' in p_parent_table) > 0 THEN v_tablename := substring(v_partition_name from position('.' in v_partition_name)+1); END IF; EXECUTE 'CREATE TABLE '||v_partition_name||' (LIKE '||p_parent_table||' INCLUDING DEFAULTS INCLUDING INDEXES)'; EXECUTE 'ALTER TABLE '||v_partition_name||' ADD CONSTRAINT '||v_tablename||'_partition_check CHECK ('||p_control||'>='||quote_literal(v_partition_timestamp_start)||' AND '||p_control||'<'||quote_literal(v_partition_timestamp_end)||')'; EXECUTE 'ALTER TABLE '||v_partition_name||' INHERIT '||p_parent_table; IF v_jobmon_schema IS NOT NULL THEN PERFORM update_step(v_step_id, 'OK', 'Done'); PERFORM close_job(v_job_id); END IF; END LOOP; -- Apply grants if configured PERFORM @extschema@.apply_grants(p_parent_table); IF v_jobmon_schema IS NOT NULL THEN EXECUTE 'SELECT set_config(''search_path'','''||v_old_search_path||''',''false'')'; END IF; RETURN v_partition_name; 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 $$;