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https://github.com/timescale/timescaledb.git
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a51d21efbe
During chunk creation, the chunk's dimensional CHECK constraints are created via an "upcall" to PL/pgSQL code. However, creating dimensional constraints in PL/pgSQL code sometimes fails, especially during high-concurrency inserts, because PL/pgSQL code scans metadata using a snapshot that might not see the same metadata as the C code. As a result, chunk creation sometimes fail during constraint creation. To fix this issue, implement dimensional CHECK-constraint creation in C code. Other constraints (FK, PK, etc.) are still created via an upcall, but should probably also be rewritten in C. However, since these constraints don't depend on recently updated metadata, this is left to a future change. Fixes #5456
102 lines
4.1 KiB
PL/PgSQL
102 lines
4.1 KiB
PL/PgSQL
DROP FUNCTION _timescaledb_internal.ping_data_node(NAME, INTERVAL);
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CREATE OR REPLACE FUNCTION _timescaledb_internal.ping_data_node(node_name NAME) RETURNS BOOLEAN
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AS '@MODULE_PATHNAME@', 'ts_data_node_ping' LANGUAGE C VOLATILE;
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DROP FUNCTION IF EXISTS _timescaledb_internal.get_approx_row_count(REGCLASS);
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ALTER EXTENSION timescaledb DROP TABLE _timescaledb_catalog.continuous_aggs_watermark;
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DROP TABLE IF EXISTS _timescaledb_catalog.continuous_aggs_watermark;
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DROP FUNCTION IF EXISTS _timescaledb_internal.cagg_watermark_materialized(hypertable_id INTEGER);
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DROP FUNCTION _timescaledb_internal.recompress_chunk_segmentwise(REGCLASS, BOOLEAN);
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DROP FUNCTION _timescaledb_internal.get_compressed_chunk_index_for_recompression(REGCLASS);
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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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$BODY$ SET search_path TO pg_catalog, pg_temp;
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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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dimension_def TEXT;
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dimtype REGTYPE;
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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_schema IS NOT NULL AND
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dimension_row.partitioning_func IS NOT NULL THEN
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SELECT prorettype INTO STRICT dimtype
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FROM pg_catalog.pg_proc pro
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WHERE pro.oid = format('%I.%I', dimension_row.partitioning_func_schema, dimension_row.partitioning_func)::regproc::oid;
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dimension_def := format('%1$I.%2$I(%3$I)',
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dimension_row.partitioning_func_schema,
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dimension_row.partitioning_func,
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dimension_row.column_name);
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ELSE
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dimension_def := format('%1$I', dimension_row.column_name);
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dimtype := dimension_row.column_type;
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END IF;
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IF dimension_row.num_slices 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(' %1$s >= %2$L ', dimension_def, 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(' %1$s < %2$L ', dimension_def, 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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-- only works with time for now
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IF _timescaledb_internal.time_literal_sql(dimension_slice_row.range_start, dimtype) =
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_timescaledb_internal.time_literal_sql(dimension_slice_row.range_end, dimtype) 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, dimtype);
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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(' %1$s >= %2$s ',
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dimension_def,
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_timescaledb_internal.time_literal_sql(dimension_slice_row.range_start, dimtype));
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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(' %1$s < %2$s ',
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dimension_def,
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_timescaledb_internal.time_literal_sql(dimension_slice_row.range_end, dimtype));
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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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$BODY$ SET search_path TO pg_catalog, pg_temp;
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