[CALCITE-2669] RelMdTableReferences should check whether references inferred from input are null for Union/Join operators

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 1.18.0
• Component/s: core
• Assignee: Jesús Camacho Rodríguez
• Reporter: Jesús Camacho Rodríguez
• Created: 13/Nov/18 21:58
• Updated: 27/Feb/24 22:24
• Resolved: 13/Nov/18 22:46

Description

Currently, there is no check and we iterate directly over the set returned, which may lead to a NPE if there is an operator underneath that is not supported.
https://github.com/apache/calcite/blob/master/core/src/main/java/org/apache/calcite/rel/metadata/RelMdTableReferences.java#L111