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_r280046818
##########
File path: core/src/main/java/org/apache/calcite/plan/RelOptUtil.java
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@@ -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:
I have add some comments for `EquiJoin` class, we need a class like this to
tell Clacite that the join definitely can not have non-equi join conditions,
either a tool method or a class, we choose the later, it is not about what is a
`EquiJoin` that much, we just need a tag class to let Clacite enumerables and
other system to mark that instance.
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