gustavodemorais commented on code in PR #26702:
URL: https://github.com/apache/flink/pull/26702#discussion_r2157531634
##########
flink-table/flink-table-planner/src/main/java/org/apache/flink/table/planner/plan/rules/logical/JoinToMultiJoinRule.java:
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@@ -546,12 +557,140 @@ private boolean canCombine(
} else {
return false;
}
- return true;
+ return haveCommonJoinKey(origJoin, join);
} else {
return false;
}
}
+ /**
+ * Checks if original Join and child multi-join have common join keys.
+ *
+ * @param origJoin original Join
+ * @param otherJoin child MultiJoin
+ * @return true if original Join and child multi-join have at least one
common JoinKey
+ */
+ private boolean haveCommonJoinKey(Join origJoin, MultiJoin otherJoin) {
Review Comment:
I think both would be work since you could also read the the "joins" _have_
a common join key 🤷♂️
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