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ce90fde526
Before this change during downgrade script generation we would always fetch the pre-update script from the previous version and prepend it to the generated scripts. This limits what can be referenced in the pre-update script and also what is possible within the downgrade itself. This patch splits the pre-update script into a generic part that is used for update/downgrade and an update specific part. We could later also add a downgrade specific part but currently it is not needed. This change is necessary because we reference a timescaledb view in the pre-update script which prevents changes to that view.
57 lines
2.5 KiB
SQL
57 lines
2.5 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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-- This file is always prepended to all upgrade and downgrade scripts.
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-- This file must avoid referencing extension objects directly as that
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-- would limit the things we can alter in extension update/downgrade
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-- itself.
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SET LOCAL search_path TO pg_catalog, pg_temp;
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-- Disable parallel execution for the duration of the update process.
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-- This avoids version mismatch errors that would have beeen triggered by the
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-- parallel workers in ts_extension_check_version().
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SET LOCAL max_parallel_workers = 0;
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-- Triggers should be disabled during upgrades to avoid having them
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-- invoke functions that might load an old version of the shared
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-- library before those functions have been updated.
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DROP EVENT TRIGGER IF EXISTS timescaledb_ddl_command_end;
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DROP EVENT TRIGGER IF EXISTS timescaledb_ddl_sql_drop;
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-- Since we want to call the new version of restart_background_workers we
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-- create a function that points to that version. The proper restart_background_workers
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-- may either be in _timescaledb_internal or in _timescaledb_functions
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-- depending on the version we are upgrading from and we can't make
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-- the move in this location as the new schema might not have been set up.
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CREATE FUNCTION _timescaledb_internal._tmp_restart_background_workers()
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RETURNS BOOL
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AS '@LOADER_PATHNAME@', 'ts_bgw_db_workers_restart'
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LANGUAGE C VOLATILE;
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SELECT _timescaledb_internal._tmp_restart_background_workers();
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DROP FUNCTION _timescaledb_internal._tmp_restart_background_workers();
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-- Table for ACL and initprivs of tables.
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CREATE TABLE _timescaledb_internal.saved_privs(
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tmpnsp name,
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tmpname name,
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tmpacl aclitem[],
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tmpini aclitem[],
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UNIQUE (tmpnsp, tmpname));
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-- We save away both the ACL and the initprivs for all tables and
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-- views in the extension (but not for chunks and internal objects) so
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-- that we can restore them to the proper state after the update.
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INSERT INTO _timescaledb_internal.saved_privs
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SELECT nspname, relname, relacl, initprivs
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FROM pg_class cl JOIN pg_namespace ns ON ns.oid = relnamespace
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JOIN pg_init_privs ip ON ip.objoid = cl.oid AND ip.objsubid = 0 AND ip.classoid = 'pg_class'::regclass
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WHERE
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nspname IN ('_timescaledb_catalog', '_timescaledb_config')
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OR (
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relname IN ('hypertable_chunk_local_size', 'compressed_chunk_stats', 'bgw_job_stat', 'bgw_policy_chunk_stats')
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AND nspname = '_timescaledb_internal'
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)
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;
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