NobiGo commented on code in PR #2781:
URL: https://github.com/apache/calcite/pull/2781#discussion_r859505596
##########
core/src/main/java/org/apache/calcite/rel/rules/SubQueryRemoveRule.java:
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@@ -450,8 +450,18 @@ private static RexNode rewriteSome(RexSubQuery e,
Set<CorrelationId> variablesSe
*/
private static RexNode rewriteExists(RexSubQuery e, Set<CorrelationId>
variablesSet,
RelOptUtil.Logic logic, RelBuilder builder) {
+ // If the sub-query is guaranteed to produce at least one row, just return
+ // TRUE.
+ final RelMetadataQuery mq = e.rel.getCluster().getMetadataQuery();
+ final Double minRowCount = mq.getMinRowCount(e.rel);
+ if (minRowCount != null && minRowCount >= 1D) {
+ return builder.literal(true);
+ }
+ final Double maxRowCount = mq.getMaxRowCount(e.rel);
+ if (maxRowCount != null && maxRowCount < 1D) {
+ return builder.literal(false);
Review Comment:
Done.
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