zzwqqq commented on code in PR #5385:
URL: https://github.com/apache/calcite/pull/5385#discussion_r4504903454
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core/src/main/java/org/apache/calcite/sql2rel/RelDecorrelator.java:
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@@ -1595,10 +1686,80 @@ private RelNode findInputRel(CorRef corVar) {
return getCorRel(corVar);
}
+ /** Checks whether this input can be repeated or shared during decorrelation.
+ * Ordinary table scans assume stable contents within a query; unknown
+ * operators are not assumed deterministic.
+ */
+ private boolean isDeterministic(RelNode rel) {
Review Comment:
Thanks, I've exposed it as `RelOptUtil.isDeterministic(RelNode)`. It follows
the existing `SqlOperator.isDeterministic()` declarations: query-stable
`CURRENT_TIMESTAMP` is allowed, while `RAND()` is rejected.
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