rubenada opened a new pull request #2131: URL: https://github.com/apache/calcite/pull/2131
Currently, the default metadata row count for join `RelMdRowCount#getRowCount(Join rel, RelMetadataQuery mq)` relies on `RelMdUtil.getJoinRowCount`. This method has several issues: - In case of ANTI join, it returns the same estimation as a SEMI join - In other cases (INNER, LEFT, RIGHT, FULL), it returns always the same formula: `leftRowCount * rightRowCount * mq.getSelectivity(join, condition)` which seems valid for an INNER join, but not for LEFT / RIGHT / FULL. The goal of this patch is fixing the ANTI computation and providing a more accurate value for LEFT / RIGHT / FULL. ---------------------------------------------------------------- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: [email protected]
