You are viewing a plain text version of this content. The canonical link for it is here.
Posted to dev@calcite.apache.org by "Ruben Q L (Jira)" <ji...@apache.org> on 2020/02/11 10:26:00 UTC
[jira] [Created] (CALCITE-3783) Rule to remove Join on top of empty
Values
Ruben Q L created CALCITE-3783:
----------------------------------
Summary: Rule to remove Join on top of empty Values
Key: CALCITE-3783
URL: https://issues.apache.org/jira/browse/CALCITE-3783
Project: Calcite
Issue Type: Improvement
Components: core
Reporter: Ruben Q L
Assignee: Ruben Q L
There are some scenarios where a Join with a left/right child being an empty values can be removed:
- [ LEFT | INNER | SEMI | ANTI ] JOIN(EmptyValues, X) => EmptyValues
- [ INNER | SEMI ] JOIN(X, EmptyValues) => EmptyValues
- ANTI (equi)JOIN(X, EmptyValues) => X
The goal is to create new rule(s) (inside a new class named e.g. JoinRemoveRule) to match and cover these scenarios.
--
This message was sent by Atlassian Jira
(v8.3.4#803005)