mirror of
https://github.com/timescale/timescaledb.git
synced 2025-05-17 02:53:51 +08:00
90c7a6f546
This PR fixes handling of one space partition. It avoids creating a CHECK constraint and also fixes the logic in default dimension range creation.
256 lines
8.2 KiB
PL/PgSQL
256 lines
8.2 KiB
PL/PgSQL
-- This file contains functions associated with creating new
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-- hypertables.
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-- Creates a new schema if it does not exist.
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CREATE OR REPLACE FUNCTION _timescaledb_internal.create_schema(
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schema_name NAME
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)
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RETURNS VOID LANGUAGE PLPGSQL VOLATILE AS
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$BODY$
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BEGIN
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EXECUTE format(
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$$
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CREATE SCHEMA IF NOT EXISTS %I
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$$, schema_name);
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END
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$BODY$
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SET client_min_messages = WARNING -- suppress NOTICE on IF EXISTS
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;
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CREATE OR REPLACE FUNCTION _timescaledb_internal.chunk_create_table(
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chunk_id INT,
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tablespace_name NAME
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)
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RETURNS VOID LANGUAGE PLPGSQL VOLATILE AS
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$BODY$
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DECLARE
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chunk_row _timescaledb_catalog.chunk;
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hypertable_row _timescaledb_catalog.hypertable;
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tablespace_clause TEXT := '';
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table_owner NAME;
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tablespace_oid OID;
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BEGIN
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SELECT * INTO STRICT chunk_row
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FROM _timescaledb_catalog.chunk
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WHERE id = chunk_id;
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SELECT * INTO STRICT hypertable_row
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FROM _timescaledb_catalog.hypertable
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WHERE id = chunk_row.hypertable_id;
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SELECT t.oid
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INTO tablespace_oid
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FROM pg_catalog.pg_tablespace t
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WHERE t.spcname = tablespace_name;
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SELECT tableowner
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INTO STRICT table_owner
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FROM pg_catalog.pg_tables
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WHERE schemaname = hypertable_row.schema_name
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AND tablename = hypertable_row.table_name;
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IF tablespace_oid IS NOT NULL THEN
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tablespace_clause := format('TABLESPACE %s', tablespace_name);
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ELSIF tablespace_name IS NOT NULL THEN
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RAISE EXCEPTION 'No tablespace % in database %', tablespace_name, current_database()
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USING ERRCODE = 'IO501';
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END IF;
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EXECUTE format(
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$$
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CREATE TABLE IF NOT EXISTS %1$I.%2$I () INHERITS(%3$I.%4$I) %5$s;
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$$,
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chunk_row.schema_name, chunk_row.table_name,
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hypertable_row.schema_name, hypertable_row.table_name, tablespace_clause
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);
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EXECUTE format(
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$$
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ALTER TABLE %1$I.%2$I OWNER TO %3$I
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$$,
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chunk_row.schema_name, chunk_row.table_name,
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table_owner
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);
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END
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$BODY$;
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CREATE OR REPLACE FUNCTION _timescaledb_internal.dimension_is_finite(
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val BIGINT
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)
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RETURNS BOOLEAN LANGUAGE SQL IMMUTABLE PARALLEL SAFE AS
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$BODY$
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--end values of bigint reserved for infinite
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SELECT val > (-9223372036854775808)::bigint AND val < 9223372036854775807::bigint
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$BODY$;
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CREATE OR REPLACE FUNCTION _timescaledb_internal.dimension_slice_get_constraint_sql(
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dimension_slice_id INTEGER
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)
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RETURNS TEXT LANGUAGE PLPGSQL VOLATILE AS
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$BODY$
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DECLARE
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dimension_slice_row _timescaledb_catalog.dimension_slice;
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dimension_row _timescaledb_catalog.dimension;
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parts TEXT[];
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BEGIN
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SELECT * INTO STRICT dimension_slice_row
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FROM _timescaledb_catalog.dimension_slice
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WHERE id = dimension_slice_id;
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SELECT * INTO STRICT dimension_row
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FROM _timescaledb_catalog.dimension
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WHERE id = dimension_slice_row.dimension_id;
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IF dimension_row.partitioning_func IS NOT NULL THEN
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IF _timescaledb_internal.dimension_is_finite(dimension_slice_row.range_start) THEN
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parts = parts || format(
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$$
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%1$I.%2$I(%3$I) >= %4$L
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$$,
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dimension_row.partitioning_func_schema,
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dimension_row.partitioning_func,
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dimension_row.column_name,
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dimension_slice_row.range_start);
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END IF;
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IF _timescaledb_internal.dimension_is_finite(dimension_slice_row.range_end) THEN
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parts = parts || format(
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$$
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%1$I.%2$I(%3$I) < %4$L
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$$,
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dimension_row.partitioning_func_schema,
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dimension_row.partitioning_func,
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dimension_row.column_name,
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dimension_slice_row.range_end);
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END IF;
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IF array_length(parts, 1) = 0 THEN
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RETURN NULL;
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END IF;
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return array_to_string(parts, 'AND');
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ELSE
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--TODO: only works with time for now
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IF _timescaledb_internal.time_literal_sql(dimension_slice_row.range_start, dimension_row.column_type) =
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_timescaledb_internal.time_literal_sql(dimension_slice_row.range_end, dimension_row.column_type) THEN
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RAISE 'Time based constraints have the same start and end values for column "%": %',
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dimension_row.column_name,
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_timescaledb_internal.time_literal_sql(dimension_slice_row.range_end, dimension_row.column_type);
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END IF;
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parts = ARRAY[]::text[];
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IF _timescaledb_internal.dimension_is_finite(dimension_slice_row.range_start) THEN
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parts = parts || format(
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$$
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%1$I >= %2$s
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$$,
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dimension_row.column_name,
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_timescaledb_internal.time_literal_sql(dimension_slice_row.range_start, dimension_row.column_type));
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END IF;
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IF _timescaledb_internal.dimension_is_finite(dimension_slice_row.range_end) THEN
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parts = parts || format(
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$$
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%1$I < %2$s
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$$,
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dimension_row.column_name,
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_timescaledb_internal.time_literal_sql(dimension_slice_row.range_end, dimension_row.column_type));
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END IF;
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return array_to_string(parts, 'AND');
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END IF;
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END
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$BODY$;
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-- Outputs the create_hypertable command to recreate the given hypertable.
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--
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-- This is currently used internally for our single hypertable backup tool
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-- so that it knows how to restore the hypertable without user intervention.
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--
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-- It only works for hypertables with up to 2 dimensions.
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CREATE OR REPLACE FUNCTION _timescaledb_internal.get_create_command(
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table_name NAME
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)
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RETURNS TEXT LANGUAGE PLPGSQL VOLATILE AS
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$BODY$
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DECLARE
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h_id INTEGER;
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schema_name NAME;
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time_column NAME;
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time_interval BIGINT;
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space_column NAME;
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space_partitions INTEGER;
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dimension_cnt INTEGER;
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dimension_row record;
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ret TEXT;
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BEGIN
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SELECT h.id, h.schema_name
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FROM _timescaledb_catalog.hypertable AS h
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WHERE h.table_name = get_create_command.table_name
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INTO h_id, schema_name;
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IF h_id IS NULL THEN
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RAISE EXCEPTION 'hypertable % not found', table_name
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USING ERRCODE = 'IO101';
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END IF;
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SELECT COUNT(*)
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FROM _timescaledb_catalog.dimension d
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WHERE d.hypertable_id = h_id
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INTO STRICT dimension_cnt;
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IF dimension_cnt > 2 THEN
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RAISE EXCEPTION 'get_create_command only supports hypertables with up to 2 dimensions'
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USING ERRCODE = 'IO101';
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END IF;
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FOR dimension_row IN
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SELECT *
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FROM _timescaledb_catalog.dimension d
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WHERE d.hypertable_id = h_id
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LOOP
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IF dimension_row.interval_length IS NOT NULL THEN
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time_column := dimension_row.column_name;
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time_interval := dimension_row.interval_length;
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ELSIF dimension_row.num_slices IS NOT NULL THEN
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space_column := dimension_row.column_name;
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space_partitions := dimension_row.num_slices;
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END IF;
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END LOOP;
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ret := format($$SELECT create_hypertable('%I.%I', '%I'$$, schema_name, table_name, time_column);
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IF space_column IS NOT NULL THEN
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ret := ret || format($$, '%I', %s$$, space_column, space_partitions);
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END IF;
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ret := ret || format($$, chunk_time_interval => %s, create_default_indexes=>FALSE);$$, time_interval);
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RETURN ret;
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END
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$BODY$;
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-- Used to make sure all time dimension columns are set as NOT NULL.
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CREATE OR REPLACE FUNCTION _timescaledb_internal.set_time_columns_not_null()
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RETURNS VOID LANGUAGE PLPGSQL VOLATILE AS
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$BODY$
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DECLARE
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ht_time_column RECORD;
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BEGIN
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FOR ht_time_column IN
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SELECT ht.schema_name, ht.table_name, d.column_name
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FROM _timescaledb_catalog.hypertable ht, _timescaledb_catalog.dimension d
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WHERE ht.id = d.hypertable_id AND d.partitioning_func IS NULL
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LOOP
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EXECUTE format(
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$$
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ALTER TABLE %I.%I ALTER %I SET NOT NULL
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$$, ht_time_column.schema_name, ht_time_column.table_name, ht_time_column.column_name);
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END LOOP;
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END
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$BODY$;
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CREATE OR REPLACE FUNCTION _timescaledb_internal.validate_triggers(main_table REGCLASS) RETURNS VOID
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AS '$libdir/timescaledb', 'hypertable_validate_triggers' LANGUAGE C STRICT;
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