xiedeyantu commented on code in PR #4308:
URL: https://github.com/apache/calcite/pull/4308#discussion_r2045676118
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core/src/main/java/org/apache/calcite/rel/rules/PruneEmptyRules.java:
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@@ -406,6 +406,9 @@ public interface UnionEmptyPruneRuleConfig extends
PruneEmptyRule.Config {
+ RelOptUtil.toString(union);
if (nonEmptyInputs == 0) {
relBuilder.push(union).empty();
+ } else if (nonEmptyInputs == 1 && !union.all) {
Review Comment:
If intersect contains two children, one is values(1) and the other is
values(), then the result will be an empty set. This is another logic, and the
original implementation is as expected.
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