hsyuan commented on a change in pull request #1410: [CALCITE-3287] Fix minor
bug, getRowCount for union in RelMdRowCount.java not consider 'union all'
URL: https://github.com/apache/calcite/pull/1410#discussion_r317417476
##########
File path:
core/src/main/java/org/apache/calcite/rel/metadata/RelMdRowCount.java
##########
@@ -83,15 +83,7 @@ public Double getRowCount(RelSubset subset,
RelMetadataQuery mq) {
}
public Double getRowCount(Union rel, RelMetadataQuery mq) {
- double rowCount = 0.0;
- for (RelNode input : rel.getInputs()) {
- Double partialRowCount = mq.getRowCount(input);
- if (partialRowCount == null) {
- return null;
- }
- rowCount += partialRowCount;
- }
- return rowCount;
+ return rel.estimateRowCount(mq);
Review comment:
`Union.estimateRowCount` doesn't take into account the case that one of the
inputs might return null.
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