feat(sql): add table_min_ and table_max_timestamp columns to tables() view#6630
Merged
bluestreak01 merged 4 commits intomasterfrom Jan 13, 2026
Merged
feat(sql): add table_min_ and table_max_timestamp columns to tables() view#6630bluestreak01 merged 4 commits intomasterfrom
bluestreak01 merged 4 commits intomasterfrom
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[PR Coverage check]😍 pass : 55 / 58 (94.83%) file detail
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Jan 13, 2026
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Documentation PR: questdb/documentation#323
Summary
This PR adds
table_min_timestampandtable_max_timestampcolumns to thetables()function, which expose the actual data timestamp range in each table. These values are updated when WAL transactions are merged into tables and during startup hydration.Changes
New columns in
tables():table_min_timestamp- Minimum timestamp of data in the tabletable_max_timestamp- Maximum timestamp of data in the tableRenamed columns for clarity:
table_max_timestamp→table_last_write_timestamp(timestamp of last TableWriter commit, not data timestamp)dedup_row_count_since_start→wal_dedup_row_count_since_start(consistentwal_prefix)Column reordering:
The new timestamp columns are placed just before
table_last_write_timestamp:Implementation Details
TableWriter.java: Added publicgetMinTimestamp()methodRecentWriteTracker.java:tableMinTimestamp/tableMaxTimestampfields toWriteStatsrecordMergeStats()to capture timestamps during WAL applyrecordWriteIfAbsent()to capture timestamps during startup hydrationtimestampparameter towriteTimestampfor clarityApplyWal2TableJob.java: Passes min/max timestamps torecordMergeStats()CairoEngine.java: Passes min/max timestamps during tracker hydrationTablesFunctionFactory.java: Added new columns and updated column indicesTest plan
ShowTablesTestandTablesFunctionFactoryTestupdated and passingRecentWriteTrackerTestupdated to verify timestamp captureSELECT table_name, table_min_timestamp, table_max_timestamp FROM tables()🤖 Generated with Claude Code