[ https://issues.apache.org/jira/browse/CALCITE-4208?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Ruben Q L reassigned CALCITE-4208: ---------------------------------- Assignee: Ruben Q L > Improve metadata row count for Join > ----------------------------------- > > Key: CALCITE-4208 > URL: https://issues.apache.org/jira/browse/CALCITE-4208 > Project: Calcite > Issue Type: Improvement > Components: core > Reporter: Ruben Q L > Assignee: Ruben Q L > Priority: Major > Labels: pull-request-available > Time Spent: 10m > Remaining Estimate: 0h > > 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. -- This message was sent by Atlassian Jira (v8.3.4#803005)