Jiajun Xie created CALCITE-5091:
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Summary: RelMdRowCount can return more accurate rowCount when
fetch is deterministic and offset is dynamic
Key: CALCITE-5091
URL: https://issues.apache.org/jira/browse/CALCITE-5091
Project: Calcite
Issue Type: Improvement
Components: core
Affects Versions: 1.30.0
Reporter: Jiajun Xie
Assignee: Jiajun Xie
The sql from https://issues.apache.org/jira/browse/CALCITE-5048
{code:java}
select * from emp order by ename limit 1 offset ?
{code}
*RelMdRowCount#getRowCount* will return 14d, because it always return rowCount
when offset is dynamic.
{code:java}
if (rel.offset instanceof RexDynamicParam) {
return rowCount;
}
{code}
Obviously, rowCount will not exceed 1 because* LIMIT 1*. We can improve it.
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