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Fix schema delta for servers that have not backfilled (#8396)
Fixes #8395.
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changelog.d/8396.feature
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changelog.d/8396.feature
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Add experimental support for sharding event persister.
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@ -21,6 +21,8 @@ SELECT setval('events_stream_seq', (
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CREATE SEQUENCE IF NOT EXISTS events_backfill_stream_seq;
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-- If the server has never backfilled a room then doing `-MIN(...)` will give
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-- a negative result, hence why we do `GREATEST(...)`
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SELECT setval('events_backfill_stream_seq', (
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SELECT COALESCE(-MIN(stream_ordering), 1) FROM events
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SELECT GREATEST(COALESCE(-MIN(stream_ordering), 1), 1) FROM events
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));
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@ -287,8 +287,12 @@ class MultiWriterIdGenerator:
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min_stream_id = min(self._current_positions.values(), default=None)
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if min_stream_id is None:
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# We add a GREATEST here to ensure that the result is always
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# positive. (This can be a problem for e.g. backfill streams where
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# the server has never backfilled).
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sql = """
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SELECT COALESCE(%(agg)s(%(id)s), 1) FROM %(table)s
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SELECT GREATEST(COALESCE(%(agg)s(%(id)s), 1), 1)
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FROM %(table)s
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""" % {
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"id": id_column,
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"table": table,
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