[DRAFT][SQL] Hash aggregate support for strings with collation #45929
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cloud-fan
reviewed
Apr 8, 2024
| messageParameters = Map.empty) | ||
| case e: Attribute if !a.groupingExpressions.exists(_.semanticEquals(e)) => | ||
| case e: Attribute if !a.groupingExpressions.exists(_.semanticEquals(e)) && | ||
| !a.groupingExpressions.exists { |
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why do we need this change?
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without it, it hits the QueryCompilationErrors.columnNotInGroupByClauseError(e)
with error: Job aborted due to stage failure: Task 0 in stage 2.0 failed 1 times, most recent failure: Lost task 0.0 in stage 2.0 (TID 2) (192.168.15.30 executor driver): org.apache.spark.SparkException: [INTERNAL_ERROR] Couldn't find name#17 in [collationkey(name#17)#30,count(1)#19L] SQLSTATE: XX000
with query plan:
Aggregate [collationkey(name#17)], [any_value(name#17, false) AS name#24, count(1) AS count(1)#20L]
+- LogicalRDD [name#17], false
so name#17 is not found in groupingExpressions
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What changes were proposed in this pull request?
Enable collation support for hash aggregate.
Why are the changes needed?
Improve AGGREGATE performance for collated strings, arrays of strings, and structs with strings.
Does this PR introduce any user-facing change?
No.
How was this patch tested?
E2e SQL tests in CollationSuite, existing TPCDS collation query test suite.
Was this patch authored or co-authored using generative AI tooling?
Yes.