xueyumusic 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_r238720519
##########
File path:
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/codegen/calls/ScalarOperators.scala
##########
@@ -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:
@twalthr I thought the similar way ago and met a problem. If we check left
is null then need to generate left code first. However in generateEqual
(generateOperatorIfNotNull) it also generate left code, such as
```
${left.code}
${right.code}
if (${left.nullTerm}) {
return ${right.nullTerm}
} else if (${right.nullTerm}) {
return ${left.nullTerm}
} else {
return generateEqual(left, right)
(here will also generate ${left.code} and ${right.code} in
generateOperatorIfNotNull)
}
```
I don't know how to make left and right code generate once if don't modify
generateOperatorIfNotNull..
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