lgbo-ustc commented on code in PR #5311:
URL: https://github.com/apache/incubator-gluten/pull/5311#discussion_r1556817411
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backends-clickhouse/src/main/scala/org/apache/gluten/execution/CHHashAggregateExecTransformer.scala:
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@@ -349,13 +349,18 @@ case class CHHashAggregateExecTransformer(
(makeStructTypeSingleOne(child.dataType, child.nullable),
child.nullable)
case covar: Covariance =>
var fields = Seq[(DataType, Boolean)]()
- fields = fields :+ (covar.left.dataType, covar.left.nullable)
- fields = fields :+ (covar.right.dataType, covar.right.nullable)
+ // when COVAR_SAMP's input is non-nullable , due to its output
maybe null in spark,
+ // backend parser will cast input type to nullable for
intermediate agg,
+ // While final stage still use input type no changed.
+ // It causes type miss match between partial and final
AggregationFunction
+ // so directly assign attr.nullable here, which should always be
nullable
+ fields = fields :+ (covar.left.dataType, attr.nullable)
+ fields = fields :+ (covar.right.dataType, attr.nullable)
Review Comment:
is there any case?
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