rubenada commented on code in PR #2831:
URL: https://github.com/apache/calcite/pull/2831#discussion_r895519624
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core/src/main/java/org/apache/calcite/plan/RelOptUtil.java:
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@@ -475,6 +475,10 @@ public static RelNode copyRelHints(RelNode originalRel,
RelNode newRel) {
* or {@code newRel} directly if one of them are not {@link Hintable}
*/
public static RelNode copyRelHints(RelNode originalRel, RelNode newRel,
boolean filterHints) {
+ if (originalRel == newRel && !filterHints) {
+ return originalRel;
Review Comment:
If we have `filterHints` we can end up with a "new rel result" right? The
result rel will be the originalRel (or newRel) with potentially fewer hints (if
at least one of the original hints is filtered out). Maybe it is a far-fetched
scenario that does not happen in practice, but I guess it is theoretically
possible, so I'd prefer to be have this check.
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