Fix HistogramUnionState.equals for empty instances#143990
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JonasKunz merged 1 commit intoelastic:mainfrom Mar 11, 2026
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Fix HistogramUnionState.equals for empty instances#143990JonasKunz merged 1 commit intoelastic:mainfrom
JonasKunz merged 1 commit intoelastic:mainfrom
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…elocations * upstream/main: (54 commits) [ES|QL|DS] Wire parallel parsing into production for text formats (elastic#143997) ESQL: Allow EXTERNAL commands be run part of the CsvTests suite (elastic#143970) [ESQL] Push stats to external source via metadata (elastic#143940) Mute org.elasticsearch.xpack.esql.CsvIT test {csv-spec:approximation.Approximate stats with stats where} elastic#144051 Refactored SortedNumericDocValuesSyntheticFieldLoader into a Layer (elastic#143912) Enable extended doc_values params feature flag in RandomizedRollingUpgradeIT (elastic#143918) Mute org.elasticsearch.xpack.esql.qa.multi_node.EsqlSpecIT test {csv-spec:approximation.Approximate stats with sample} elastic#144022 Ensure we use float values for rolling upgrade float vectors (elastic#144032) Remove sensitive info from reindex task description (elastic#143635) Fix HistogramUnionState.equals (elastic#143990) Use dedicated IndexRouting API in ShardSplittingQuery (elastic#143776) Engine/Store DistributedArchitectureGuide doc (elastic#143818) Mute org.elasticsearch.snapshots.ConcurrentSnapshotsIT testDeletesAreBatched elastic#144034 Avoid serializing exceptions as JSON in remote write endpoint (elastic#143987) allow testLoadDocSequenceReturnsCorrectResultsText to circuit break, it happens in serverless occasionally (elastic#144023) [ESQL] Adds memory accounting to GroupedLimitOperator (elastic#143941) Adjust ESIntegTestCase.getLiveDocs method to account for pruned sequence numbers (elastic#143999) Support target bucket count in `TBUCKET` with explicit from/to date range (elastic#142747) TSDBDocValuesFormatSingleNodeTests with and without synthetic id (elastic#144002) Fix circuit breaker leak in BreakingTDigestHolder (elastic#143873) ...
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I was notified by @nicktindall about an apparently rare test failure related to histograms in queryDSL:
As it turns out, there was a bug in the
HistogramUnionStateclass I recently introduced: For empty states, we use a singleton instance. That singleton is in fact a sub-class, preventing mutations. At the same time inequalswe were checking the class identity, causing deserialzed, emptyHistogramUnionStates to not be equal to that singleton.