hsyuan commented on a change in pull request #1907: [CALCITE-3909]
RelMdMinRowCount doesn't take into account UNION DISTINCT
URL: https://github.com/apache/calcite/pull/1907#discussion_r407013426
##########
File path:
core/src/main/java/org/apache/calcite/rel/metadata/RelMdMinRowCount.java
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@@ -61,7 +61,16 @@ public Double getMinRowCount(Union rel, RelMetadataQuery
mq) {
rowCount += partialRowCount;
}
}
- return rowCount;
+
+ if (rel.all) {
+ return rowCount;
+ } else {
+ if (rowCount < 1) {
+ return rowCount;
+ } else {
+ return 1d;
+ }
Review comment:
`return min(rowCount, 1d);`
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