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CREATE FUNCTION @extschema@.partition_gap_fill(p_parent_table text) RETURNS integer
LANGUAGE plpgsql
AS $$
DECLARE
v_child_created boolean;
v_children_created_count int := 0;
v_control text;
v_control_type text;
v_current_child_start_id bigint;
v_current_child_start_timestamp timestamptz;
v_epoch text;
v_expected_next_child_id bigint;
v_expected_next_child_timestamp timestamptz;
v_final_child_schemaname text;
v_final_child_start_id bigint;
v_final_child_start_timestamp timestamptz;
v_final_child_tablename text;
v_interval_id bigint;
v_interval_time interval;
v_previous_child_schemaname text;
v_previous_child_tablename text;
v_previous_child_start_id bigint;
v_previous_child_start_timestamp timestamptz;
v_parent_schema text;
v_parent_table text;
v_parent_tablename text;
v_partition_interval text;
v_row record;
BEGIN
SELECT parent_table, partition_interval, control, epoch
INTO v_parent_table, v_partition_interval, v_control, v_epoch
FROM @extschema@.part_config
WHERE parent_table = p_parent_table;
IF v_parent_table IS NULL THEN
RAISE EXCEPTION 'Given parent table has no configuration in pg_partman: %', p_parent_table;
END IF;
SELECT n.nspname, c.relname INTO v_parent_schema, v_parent_tablename
FROM pg_catalog.pg_class c
JOIN pg_catalog.pg_namespace n ON c.relnamespace = n.oid
WHERE n.nspname = split_part(p_parent_table, '.', 1)::name
AND c.relname = split_part(p_parent_table, '.', 2)::name;
IF v_parent_tablename IS NULL THEN
RAISE EXCEPTION 'Unable to find given parent table in system catalogs. Ensure it is schema qualified: %', p_parent_table;
END IF;
SELECT general_type INTO v_control_type FROM @extschema@.check_control_type(v_parent_schema, v_parent_tablename, v_control);
SELECT partition_schemaname, partition_tablename
INTO v_final_child_schemaname, v_final_child_tablename
FROM @extschema@.show_partitions(v_parent_table, 'DESC')
LIMIT 1;
IF v_control_type IN ('time', 'text', 'uuid') OR (v_control_type = 'id' AND v_epoch <> 'none') THEN
v_interval_time := v_partition_interval::interval;
SELECT child_start_time INTO v_final_child_start_timestamp
FROM @extschema@.show_partition_info(format('%s', v_final_child_schemaname||'.'||v_final_child_tablename), p_parent_table := v_parent_table);
FOR v_row IN
SELECT partition_schemaname, partition_tablename
FROM @extschema@.show_partitions(v_parent_table, 'ASC')
LOOP
RAISE DEBUG 'v_row.partition_tablename: %, v_final_child_start_timestamp: %', v_row.partition_tablename, v_final_child_start_timestamp;
IF v_previous_child_tablename IS NULL THEN
v_previous_child_schemaname := v_row.partition_schemaname;
v_previous_child_tablename := v_row.partition_tablename;
SELECT child_start_time INTO v_previous_child_start_timestamp
FROM @extschema@.show_partition_info(format('%s', v_previous_child_schemaname||'.'||v_previous_child_tablename), p_parent_table := v_parent_table);
CONTINUE;
END IF;
v_expected_next_child_timestamp := v_previous_child_start_timestamp + v_interval_time;
RAISE DEBUG 'v_expected_next_child_timestamp: %', v_expected_next_child_timestamp;
IF v_expected_next_child_timestamp = v_final_child_start_timestamp THEN
EXIT;
END IF;
SELECT child_start_time INTO v_current_child_start_timestamp
FROM @extschema@.show_partition_info(format('%s', v_row.partition_schemaname||'.'||v_row.partition_tablename), p_parent_table := v_parent_table);
RAISE DEBUG 'v_current_child_start_timestamp: %', v_current_child_start_timestamp;
IF v_expected_next_child_timestamp != v_current_child_start_timestamp THEN
v_child_created := @extschema@.create_partition_time(v_parent_table, ARRAY[v_expected_next_child_timestamp]);
IF v_child_created THEN
v_children_created_count := v_children_created_count + 1;
v_child_created := false;
END IF;
SELECT partition_schema, partition_table INTO v_previous_child_schemaname, v_previous_child_tablename
FROM @extschema@.show_partition_name(v_parent_table, v_expected_next_child_timestamp::text);
-- Need to stay in another inner loop until the next expected child timestamp matches the current one
-- Once it does, exit. This means gap is filled.
LOOP
v_previous_child_start_timestamp := v_expected_next_child_timestamp;
v_expected_next_child_timestamp := v_expected_next_child_timestamp + v_interval_time;
IF v_expected_next_child_timestamp = v_current_child_start_timestamp THEN
EXIT;
ELSE
RAISE DEBUG 'inner loop: v_previous_child_start_timestamp: %, v_expected_next_child_timestamp: %, v_children_created_count: %'
, v_previous_child_start_timestamp, v_expected_next_child_timestamp, v_children_created_count;
v_child_created := @extschema@.create_partition_time(v_parent_table, ARRAY[v_expected_next_child_timestamp]);
IF v_child_created THEN
v_children_created_count := v_children_created_count + 1;
v_child_created := false;
END IF;
END IF;
END LOOP; -- end expected child loop
END IF;
v_previous_child_schemaname := v_row.partition_schemaname;
v_previous_child_tablename := v_row.partition_tablename;
SELECT child_start_time INTO v_previous_child_start_timestamp
FROM @extschema@.show_partition_info(format('%s', v_previous_child_schemaname||'.'||v_previous_child_tablename), p_parent_table := v_parent_table);
END LOOP; -- end time loop
ELSIF v_control_type = 'id' THEN
v_interval_id := v_partition_interval::bigint;
SELECT child_start_id INTO v_final_child_start_id
FROM @extschema@.show_partition_info(format('%s', v_final_child_schemaname||'.'||v_final_child_tablename), p_parent_table := v_parent_table);
FOR v_row IN
SELECT partition_schemaname, partition_tablename
FROM @extschema@.show_partitions(v_parent_table, 'ASC')
LOOP
RAISE DEBUG 'v_row.partition_tablename: %, v_final_child_start_id: %', v_row.partition_tablename, v_final_child_start_id;
IF v_previous_child_tablename IS NULL THEN
v_previous_child_schemaname := v_row.partition_schemaname;
v_previous_child_tablename := v_row.partition_tablename;
SELECT child_start_id INTO v_previous_child_start_id
FROM @extschema@.show_partition_info(format('%s', v_previous_child_schemaname||'.'||v_previous_child_tablename), p_parent_table := v_parent_table);
CONTINUE;
END IF;
v_expected_next_child_id := v_previous_child_start_id + v_interval_id;
RAISE DEBUG 'v_expected_next_child_id: %', v_expected_next_child_id;
IF v_expected_next_child_id = v_final_child_start_id THEN
EXIT;
END IF;
SELECT child_start_id INTO v_current_child_start_id
FROM @extschema@.show_partition_info(format('%s', v_row.partition_schemaname||'.'||v_row.partition_tablename), p_parent_table := v_parent_table);
RAISE DEBUG 'v_current_child_start_id: %', v_current_child_start_id;
IF v_expected_next_child_id != v_current_child_start_id THEN
v_child_created := @extschema@.create_partition_id(v_parent_table, ARRAY[v_expected_next_child_id]);
IF v_child_created THEN
v_children_created_count := v_children_created_count + 1;
v_child_created := false;
END IF;
SELECT partition_schema, partition_table INTO v_previous_child_schemaname, v_previous_child_tablename
FROM @extschema@.show_partition_name(v_parent_table, v_expected_next_child_id::text);
-- Need to stay in another inner loop until the next expected child id matches the current one
-- Once it does, exit. This means gap is filled.
LOOP
v_previous_child_start_id := v_expected_next_child_id;
v_expected_next_child_id := v_expected_next_child_id + v_interval_id;
IF v_expected_next_child_id = v_current_child_start_id THEN
EXIT;
ELSE
RAISE DEBUG 'inner loop: v_previous_child_start_id: %, v_expected_next_child_id: %, v_children_created_count: %'
, v_previous_child_start_id, v_expected_next_child_id, v_children_created_count;
v_child_created := @extschema@.create_partition_id(v_parent_table, ARRAY[v_expected_next_child_id]);
IF v_child_created THEN
v_children_created_count := v_children_created_count + 1;
v_child_created := false;
END IF;
END IF;
END LOOP; -- end expected child loop
END IF;
v_previous_child_schemaname := v_row.partition_schemaname;
v_previous_child_tablename := v_row.partition_tablename;
SELECT child_start_id INTO v_previous_child_start_id
FROM @extschema@.show_partition_info(format('%s', v_previous_child_schemaname||'.'||v_previous_child_tablename), p_parent_table := v_parent_table);
END LOOP; -- end id loop
END IF; -- end time/id if
RETURN v_children_created_count;
END
$$;
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