feat(plugin-backfill): report intermediate query metrics during polling#101
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feat(plugin-backfill): report intermediate query metrics during polling#101
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queryStatus now fetches read_rows, written_rows, elapsed etc. from system.processes instead of just count(). onProgress fires whenever metrics change, not only on state transitions, giving visibility into long-running chunks. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
…query LIMIT after SETTINGS is a syntax error in ClickHouse distributed queries, causing queryStatus() to fail on every poll and backfill chunks to be marked as failed after maxPollErrors consecutive exceptions. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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Summary
queryStatusnow fetchesread_rows,read_bytes,written_rows,written_bytes, andelapsedfromsystem.processesinstead of justcount(), so running queries return real metricsreadRows,readBytes,elapsedMsfields toQueryStatusandBackfillChunkStateapplyQueryStatusdetects metric changes (not just state transitions), soonProgressfires on every poll with new data — giving visibility into long-running chunks instead of silence for 20+ minutesTest plan
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