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perf: Remove unused naturalJoin key states. #5770
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cpwright
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Remove unused naturalJoin key states.
perf: Remove unused naturalJoin key states.
Jul 13, 2024
cpwright
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Jul 13, 2024
rcaudy
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Jul 16, 2024
rcaudy
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Jul 16, 2024
...ava/io/deephaven/engine/table/impl/by/typed/incopenagg/gen/IncrementalAggOpenHasherChar.java
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.../io/deephaven/engine/table/impl/naturaljoin/IncrementalNaturalJoinStateManagerTypedBase.java
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rcaudy
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Jul 19, 2024
.../table/src/main/java/io/deephaven/engine/table/impl/by/ChunkedOperatorAggregationHelper.java
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…raljoin/IncrementalNaturalJoinStateManagerTypedBase.java Co-authored-by: Ryan Caudy <rcaudy@gmail.com>
…raljoin/typed/incopen/gen/IncrementalNaturalJoinHasherChar.java Co-authored-by: Ryan Caudy <rcaudy@gmail.com>
rcaudy
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I can approve as-is. There are a few open comments, though. Maybe worth addressing the one about the unnecessary alternateLiveEntries
?
rcaudy
approved these changes
Jul 21, 2024
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The generated hash tables for naturalJoin (and other operations) never removed a bucket's hash table entry when it became entry. For cases where a naturalJoin cycles through buckets, the hash table could be filled with empty values consuming memory without reason.
This changes the generated open addressed hash table for both-sides incremental naturalJoin to mark entries deleted with a tombstone when both the left and right side are empty. The occupancy of the hash table for use in load factor computation includes the number of entries in the hash table and tombstones. The rehash operation may copy entries into a new table that is the same size as the original table instead of always doubling in size, allowing tombstone entries to be reaped.
Closes #5769