danny0405 commented on a change in pull request #1157: [CALCITE-2969] Improve
design of join-like relational expressions
URL: https://github.com/apache/calcite/pull/1157#discussion_r279991025
##########
File path: core/src/main/java/org/apache/calcite/plan/RelOptUtil.java
##########
@@ -3734,6 +3740,13 @@ private Exists(RelNode r, boolean indicator, boolean
outerJoin) {
this.outerJoin = outerJoin;
}
}
+
+ /** Check if it is the join whose condition is based on column equality. */
+ public static boolean isEquiJoin(Join join) {
+ return join.isNonCorrelateSemiJoin()
+ || join instanceof EnumerableHashJoin
+ || join instanceof EnumerableMergeJoin;
+ }
Review comment:
There is a discussion about what is an `EquiJoin` in the @dev mail list, see
[1].
[1]
https://lists.apache.org/list.html?d...@calcite.apache.org:lte=1M:What%20is%20the%20exactly%20definition%20as%20an%20equi%20join
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