8bf45d5456
Investigated three approaches for CH 24.12: - Inline SETTINGS on ADD PROJECTION: rejected (UNKNOWN_SETTING — not a query-level setting). - ALTER TABLE MODIFY SETTING deduplicate_merge_projection_mode='rebuild': works; persists in table metadata across connection restarts; runs before ADD PROJECTION in the SQL script. - Session-level JDBC URL param: not pursued (MODIFY SETTING is strictly better). alerting_projections.sql now runs MODIFY SETTING before the two executions ADD PROJECTIONs. AlertingProjectionsIT strengthened to assert all four projections (including alerting_app_status and alerting_route_status on executions) exist after schema init. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
36 lines
1.8 KiB
SQL
36 lines
1.8 KiB
SQL
-- Alerting projections — additive and idempotent (IF NOT EXISTS).
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-- Safe to run on every startup alongside init.sql.
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--
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-- executions uses ReplacingMergeTree. ClickHouse 24.x requires deduplicate_merge_projection_mode='rebuild'
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-- for projections to work on ReplacingMergeTree. ALTER TABLE MODIFY SETTING persists the setting in
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-- table metadata (survives restarts) and runs before the ADD PROJECTION statements.
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-- logs and agent_metrics use plain MergeTree and do not need this setting.
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--
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-- MATERIALIZE statements are wrapped as non-fatal to handle empty tables in fresh deployments.
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-- Plain MergeTree tables: always succeed
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ALTER TABLE logs
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ADD PROJECTION IF NOT EXISTS alerting_app_level
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(SELECT * ORDER BY (tenant_id, environment, application, level, timestamp));
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ALTER TABLE agent_metrics
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ADD PROJECTION IF NOT EXISTS alerting_instance_metric
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(SELECT * ORDER BY (tenant_id, environment, instance_id, metric_name, collected_at));
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-- ReplacingMergeTree: set table-level setting so ADD PROJECTION succeeds on any connection
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ALTER TABLE executions MODIFY SETTING deduplicate_merge_projection_mode = 'rebuild';
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ALTER TABLE executions
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ADD PROJECTION IF NOT EXISTS alerting_app_status
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(SELECT * ORDER BY (tenant_id, environment, application_id, status, start_time));
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ALTER TABLE executions
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ADD PROJECTION IF NOT EXISTS alerting_route_status
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(SELECT * ORDER BY (tenant_id, environment, route_id, status, start_time));
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-- MATERIALIZE: best-effort on all tables (non-fatal if table is empty or already running)
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ALTER TABLE logs MATERIALIZE PROJECTION alerting_app_level;
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ALTER TABLE agent_metrics MATERIALIZE PROJECTION alerting_instance_metric;
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ALTER TABLE executions MATERIALIZE PROJECTION alerting_app_status;
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ALTER TABLE executions MATERIALIZE PROJECTION alerting_route_status;
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