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https://issues.apache.org/jira/browse/CALCITE-3287?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16915132#comment-16915132
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Hong Shen commented on CALCITE-3287:
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Thanks [~julianhyde], I will add a patch to fix it.
> Union's getRowCount in RelMdRowCount has not consider 'union all'
> -----------------------------------------------------------------
>
> Key: CALCITE-3287
> URL: https://issues.apache.org/jira/browse/CALCITE-3287
> Project: Calcite
> Issue Type: Bug
> Components: core
> Reporter: Hong Shen
> Priority: Minor
>
> when I read the RelMdRowCount.java, I found that union's getRowCount has not
> consider 'union all', while in Union.estimateRowCount has. I am not sure
> whether this is a bug, if it is, I can help fix it.
> {code:java}
> RelMdRowCount.java
> 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;
> }
> Union.java
> @Override public double estimateRowCount(RelMetadataQuery mq) {
> double dRows = RelMdUtil.getUnionAllRowCount(mq, this);
> if (!all) {
> dRows *= 0.5;
> }
> return dRows;
> }
> {code}
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