[CALCITE-2287] StackOverflowError from FlatList equals()

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 1.17.0
• Assignee: Julian Hyde
• Reporter: Zhong Yu
• Created: 27/Apr/18 06:54
• Updated: 20/Jul/18 08:18
• Resolved: 01/May/18 23:01

Description

The equals() method of `Flat3List` and `Flat4List` may invoke each other in an infinite loop.

See also https://issues.apache.org/jira/browse/HIVE-18427

 

We found this problem when such lists are used as keys in `RelMetadataQuery.map`; occasionally there are hashcode collisions between `Flat3List` and `Flat4List`, hence their equals() methods will be invoked.