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edd3999553
Prevent insert on compressed chunks by adding a trigger that blocks it. Enable insert if the chunk gets decompressed.
42 lines
2.1 KiB
SQL
42 lines
2.1 KiB
SQL
-- 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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-- Built-in function for calculating the next chunk interval when
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-- using adaptive chunking. The function can be replaced by a
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-- user-defined function with the same signature.
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--
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-- The parameters passed to the function are as follows:
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--
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-- dimension_id: the ID of the dimension to calculate the interval for
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-- dimension_coord: the coordinate / point on the dimensional axis
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-- where the tuple that triggered this chunk creation falls.
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-- chunk_target_size: the target size in bytes that the chunk should have.
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--
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-- The function should return the new interval in dimension-specific
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-- time (ususally microseconds).
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CREATE OR REPLACE FUNCTION _timescaledb_internal.calculate_chunk_interval(
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dimension_id INTEGER,
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dimension_coord BIGINT,
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chunk_target_size BIGINT
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) RETURNS BIGINT AS '@MODULE_PATHNAME@', 'ts_calculate_chunk_interval' LANGUAGE C;
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-- Function for explicit chunk exclusion. Supply a record and an array
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-- of chunk ids as input.
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-- Intended to be used in WHERE clause.
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-- An example: SELECT * FROM hypertable WHERE _timescaledb_internal.chunks_in(hypertable, ARRAY[1,2]);
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--
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-- Use it with care as this function directly affects what chunks are being scanned for data.
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-- Although this function is immutable (always returns true), we declare it here as volatile
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-- so that the PostgreSQL optimizer does not try to evaluate/reduce it in the planner phase
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CREATE OR REPLACE FUNCTION _timescaledb_internal.chunks_in(record RECORD, chunks INTEGER[]) RETURNS BOOL
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AS '@MODULE_PATHNAME@', 'ts_chunks_in' LANGUAGE C VOLATILE STRICT;
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--given a chunk's relid, return the id. Error out if not a chunk relid.
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CREATE OR REPLACE FUNCTION _timescaledb_internal.chunk_id_from_relid(relid OID) RETURNS INTEGER
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AS '@MODULE_PATHNAME@', 'ts_chunk_id_from_relid' LANGUAGE C STABLE STRICT PARALLEL SAFE;
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--trigger to block dml on a chunk --
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CREATE OR REPLACE FUNCTION _timescaledb_internal.chunk_dml_blocker() RETURNS trigger
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AS '@MODULE_PATHNAME@', 'ts_chunk_dml_blocker' LANGUAGE C;
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