HanumathRao commented on code in PR #3640:
URL: https://github.com/apache/calcite/pull/3640#discussion_r1496913804
##########
core/src/main/java/org/apache/calcite/plan/RelOptUtil.java:
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@@ -286,6 +286,22 @@ public static Set<CorrelationId> getVariablesUsed(RelNode
rel) {
return visitor.vuv.variables;
}
+ /**
+ * Returns a set of variables used by the given list of sub-queries and its
descendants.
+ *
+ * <p> Internally it uses the {@link
org.apache.calcite.plan.RelOptUtil#getVariablesUsed}
+ * to get all the variables used in the relational expression of a given
sub-query.
+ *
+ * <p> The item type is same as {@link
org.apache.calcite.rex.RexCorrelVariable#id}.
Review Comment:
I used the same comment format as that of getVariablesUsed(RelNode rel) as
both the functions return same output, In this context item type is a type
parameter for Set<>
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