wuchong commented on a change in pull request #9285:
[FLINK-13433][table-planner-blink] Do not fetch data from
LookupableTableSource if the JoinKey in left side of LookupJoin contains null
value.
URL: https://github.com/apache/flink/pull/9285#discussion_r310390595
##########
File path:
flink-table/flink-table-planner-blink/src/main/scala/org/apache/flink/table/planner/codegen/LookupJoinCodeGenerator.scala
##########
@@ -87,11 +87,16 @@ object LookupJoinCodeGenerator {
s"$lookupFunctionTerm.setCollector($DEFAULT_COLLECTOR_TERM);"
}
+ // TODO assume filterNulls are all true here
Review comment:
This comment is still hard to understand. I can't find `filterNulls` in the
context.
Suggestion:
```
TODO: filter all records when we meet any nulls on the join key, because we
don't support "IS NOT DISTINCT FROM" currently.
```
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