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https://github.com/timescale/timescaledb.git
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102 lines
3.8 KiB
PL/PgSQL
102 lines
3.8 KiB
PL/PgSQL
-- This file and its contents are licensed under the Apache License 2.0.
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-- Please see the included NOTICE for copyright information and
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-- LICENSE-APACHE for a copy of the license.
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-- chunk - the OID of the chunk to be CLUSTERed
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-- index - the OID of the index to be CLUSTERed on, or NULL to use the index
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-- last used
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CREATE OR REPLACE FUNCTION @extschema@.reorder_chunk(
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chunk REGCLASS,
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index REGCLASS=NULL,
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verbose BOOLEAN=FALSE
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) RETURNS VOID AS '@MODULE_PATHNAME@', 'ts_reorder_chunk' LANGUAGE C VOLATILE;
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CREATE OR REPLACE FUNCTION @extschema@.move_chunk(
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chunk REGCLASS,
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destination_tablespace Name,
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index_destination_tablespace Name=NULL,
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reorder_index REGCLASS=NULL,
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verbose BOOLEAN=FALSE
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) RETURNS VOID AS '@MODULE_PATHNAME@', 'ts_move_chunk' LANGUAGE C VOLATILE;
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CREATE OR REPLACE FUNCTION _timescaledb_internal.create_compressed_chunk(
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chunk REGCLASS,
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chunk_table REGCLASS,
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uncompressed_heap_size BIGINT,
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uncompressed_toast_size BIGINT,
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uncompressed_index_size BIGINT,
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compressed_heap_size BIGINT,
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compressed_toast_size BIGINT,
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compressed_index_size BIGINT,
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numrows_pre_compression BIGINT,
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numrows_post_compression BIGINT
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) RETURNS REGCLASS AS '@MODULE_PATHNAME@', 'ts_create_compressed_chunk' LANGUAGE C STRICT VOLATILE;
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CREATE OR REPLACE FUNCTION @extschema@.compress_chunk(
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uncompressed_chunk REGCLASS,
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if_not_compressed BOOLEAN = false
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) RETURNS REGCLASS AS '@MODULE_PATHNAME@', 'ts_compress_chunk' LANGUAGE C STRICT VOLATILE;
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CREATE OR REPLACE FUNCTION @extschema@.decompress_chunk(
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uncompressed_chunk REGCLASS,
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if_compressed BOOLEAN = false
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) RETURNS REGCLASS AS '@MODULE_PATHNAME@', 'ts_decompress_chunk' LANGUAGE C STRICT VOLATILE;
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-- Recompress a chunk
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--
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-- Will give an error if the chunk was not already compressed. In this
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-- case, the user should use compress_chunk instead. Note that this
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-- function cannot be executed in an explicit transaction since it
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-- contains transaction control commands.
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--
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-- Parameters:
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-- chunk: Chunk to recompress.
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-- if_not_compressed: Print notice instead of error if chunk is already compressed.
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CREATE OR REPLACE PROCEDURE @extschema@.recompress_chunk(chunk REGCLASS,
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if_not_compressed BOOLEAN = false)
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AS $$
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DECLARE
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status INT;
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chunk_name TEXT[];
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BEGIN
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-- procedures with SET clause cannot execute transaction
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-- control so we adjust search_path in procedure body
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SET LOCAL search_path TO pg_catalog, pg_temp;
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status := _timescaledb_internal.chunk_status(chunk);
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-- Chunk names are in the internal catalog, but we only care about
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-- the chunk name here.
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-- status bits:
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-- 1: compressed
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-- 2: compressed unordered
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-- 4: frozen
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-- 8: compressed partial
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chunk_name := parse_ident(chunk::text);
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CASE
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WHEN status = 0 THEN
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RAISE EXCEPTION 'call compress_chunk instead of recompress_chunk';
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WHEN status = 1 THEN
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IF if_not_compressed THEN
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RAISE NOTICE 'nothing to recompress in chunk "%"', chunk_name[array_upper(chunk_name,1)];
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RETURN;
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ELSE
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RAISE EXCEPTION 'nothing to recompress in chunk "%"', chunk_name[array_upper(chunk_name,1)];
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END IF;
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WHEN status = 3 OR status = 9 OR status = 11 THEN
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PERFORM @extschema@.decompress_chunk(chunk);
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COMMIT;
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-- SET LOCAL is only active until end of transaction.
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-- While we could use SET at the start of the function we do not
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-- want to bleed out search_path to caller, so we do SET LOCAL
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-- again after COMMIT
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SET LOCAL search_path TO pg_catalog, pg_temp;
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ELSE
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RAISE EXCEPTION 'unexpected chunk status % in chunk "%"', status, chunk_name[array_upper(chunk_name,1)];
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END CASE;
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PERFORM @extschema@.compress_chunk(chunk, if_not_compressed);
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END
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$$ LANGUAGE plpgsql;
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