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60efc51a2b
* Move background update names out to a separate class `EventsBackgroundUpdatesStore` gets inherited and we don't really want to further pollute the namespace. * Migrate stream_ordering to a bigint * changelog
41 lines
1.7 KiB
Plaintext
41 lines
1.7 KiB
Plaintext
/* Copyright 2021 The Matrix.org Foundation C.I.C
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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-- This migration handles the process of changing the type of `stream_ordering` to
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-- a BIGINT.
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--
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-- Note that this is only a problem on postgres as sqlite only has one "integer" type
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-- which can cope with values up to 2^63.
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-- First add a new column to contain the bigger stream_ordering
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ALTER TABLE events ADD COLUMN stream_ordering2 BIGINT;
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-- Create a rule which will populate it for new rows.
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CREATE OR REPLACE RULE "populate_stream_ordering2" AS
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ON INSERT TO events
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DO UPDATE events SET stream_ordering2=NEW.stream_ordering WHERE stream_ordering=NEW.stream_ordering;
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-- Start a bg process to populate it for old events
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INSERT INTO background_updates (ordering, update_name, progress_json) VALUES
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(6001, 'populate_stream_ordering2', '{}');
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-- ... and another to build an index on it
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INSERT INTO background_updates (ordering, update_name, progress_json, depends_on) VALUES
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(6001, 'index_stream_ordering2', '{}', 'populate_stream_ordering2');
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-- ... and another to do the switcheroo
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INSERT INTO background_updates (ordering, update_name, progress_json, depends_on) VALUES
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(6001, 'replace_stream_ordering_column', '{}', 'index_stream_ordering2');
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