twalthr commented on a change in pull request #7079: [FLINK-10845][table]
Support multiple different DISTINCT aggregates for batch
URL: https://github.com/apache/flink/pull/7079#discussion_r238696433
##########
File path:
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/codegen/calls/ScalarOperators.scala
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@@ -191,7 +191,17 @@ object ScalarOperators {
)
)
}
- }
+ }
+
+ def generateDistinctFrom(
+ nullCheck: Boolean,
+ left: GeneratedExpression,
+ right: GeneratedExpression)
+ : GeneratedExpression = {
+ val newleft = left.copy(nullTerm = GeneratedExpression.NEVER_NULL)
Review comment:
This looks not correct to me. By setting the expression to never null, you
basically compare the default values of expressions. Long has `0L` for example.
For example, a `0 IS NOT DISTINCT FROM NULL` might return `true`.
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