feat: Enable the hash join to accept a pre-built hash table for joining#1661
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feat: Enable the hash join to accept a pre-built hash table for joining#1661
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alchemy merge |
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alchemy link 8ca7ac1 |
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Added new rebase item:
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This was referenced Feb 25, 2026
This was referenced Mar 7, 2026
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In Spark, the hash table is constructed only once in the driver and then broadcasted to each executor. In Gluten, we replace the broadcast hash join with a hash join, which leads to performance issues when the broadcast threshold increases. This is because each task must build its own hash table when using hash join.
This PR enables HashBuild to accept pre-built HashTable, thereby bypassing the hash table construction process. Additionally, it modifies HashProbe to avoid clearing the shared hash table after use.