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fix: set deduplicate_merge_projection_mode for ReplacingMergeTree projection
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Browse Source 
ClickHouse 24.12 requires this setting before adding projections to
ReplacingMergeTree tables. Using 'drop' mode which discards the projection
during deduplication merges and rebuilds it afterward.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
This commit is contained in:
hsiegeln
2026-04-03 15:14:56 +02:00
parent 984bb2d40f
commit bb3e1e2bc3
1 changed files with 3 additions and 0 deletions
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cameleer3-server-app/src/main/resources/clickhouse/V11__route_diagrams_projection.sql
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@@ -1,6 +1,9 @@
-- Projection for fast route_id + instance_id lookups on route_diagrams. -- Projection for fast route_id + instance_id lookups on route_diagrams.
-- The primary key is (tenant_id, content_hash) which serves hash-based lookups. -- The primary key is (tenant_id, content_hash) which serves hash-based lookups.
-- Queries filtering by route_id + instance_id were scanning millions of rows. -- Queries filtering by route_id + instance_id were scanning millions of rows.
-- ReplacingMergeTree requires deduplicate_merge_projection_mode to be set (ClickHouse 24.12+).
ALTER TABLE route_diagrams MODIFY SETTING deduplicate_merge_projection_mode = 'drop';
ALTER TABLE route_diagrams ALTER TABLE route_diagrams
ADD PROJECTION IF NOT EXISTS prj_route_instance ADD PROJECTION IF NOT EXISTS prj_route_instance
(SELECT content_hash, created_at ORDER BY tenant_id, route_id, instance_id, created_at); (SELECT content_hash, created_at ORDER BY tenant_id, route_id, instance_id, created_at);