[HIVE-16947] Semijoin Reduction : Task cycle created due to multiple semijoins in conjunction with hashjoin

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 3.0.0
• Assignee: Deepak Jaiswal
• Reporter: Deepak Jaiswal
• Created: 23/Jun/17 03:12
• Updated: 22/May/18 23:59
• Resolved: 28/Jun/17 18:03

Description

Typically a semijoin branch and a mapjoin may create a cycle when on same operator tree. This is already handled, however, a semijoin branch can serve more than one filters and the cycle detection logic currently only handles the 1st one causing cycles preventing the queries from running.