wuchong commented on a change in pull request #10144:
[FLINK-14613][table-planner-blink] Fix temporal table join when containing
multiple keyfields with UDF
URL: https://github.com/apache/flink/pull/10144#discussion_r346853266
##########
File path:
flink-table/flink-table-planner-blink/src/main/scala/org/apache/flink/table/planner/plan/nodes/common/CommonLookupJoin.scala
##########
@@ -419,19 +419,17 @@ abstract class CommonLookupJoin(
joinKeyPairs: Array[IntPair],
joinInfo: JoinInfo,
allLookupKeys: Map[Int, LookupKey]): Option[RexNode] = {
- val remainingPairs = joinKeyPairs.filter(p =>
!checkedLookupFields.contains(p.target))
+ val joinPairs = joinInfo.pairs().asScala.toArray
+ val remainingPairs = joinPairs.filter(p =>
!checkedLookupFields.contains(p.target))
Review comment:
This is still not right.
If we change the new added test query to the following:
```sql
val sql = "SELECT T.id, T.content, D.age FROM T JOIN userTable " +
"for system_time as of T.proctime AS D ON T.content = concat(D.name,
'!') AND D.age = 11"
```
Just remove the `D.name` from SELECT, the result will be wrong.
`checkedLookupFields` is the field index of the dim table, we should reflect
to the index of calc.
The following diagram explains the internals.
```java
* Join (l.name = r.name)
* / \
* RelNode Calc (concat(name, "!") as name)
* |
* DimTable (lookup: age=11)
* (age, id, name)
*
*
* joinPairs= "0=0" (equal condition of Join)
* joinKeyPairs = empty (left input field index to dim table field index)
* checkedLookupFields = 0 (lookup index of "age" field in table)
```
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