[DRILL-5691] multiple count distinct query planning error at physical phase

• Type: Bug
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: 1.9.0, 1.10.0
• Component/s: Execution - Relational Operators
• Assignee: Unassigned
• Reporter: Weijie Tong
• Reviewer: Aman Sinha
• Created: 27/Jul/17 02:29
• Updated: 25/Oct/22 02:07

Description

I materialized the count distinct query result in a cache , added a plugin rule to translate the (Aggregate、Aggregate、Project、Scan) or (Aggregate、Aggregate、Scan) to (Project、Scan) at the PARTITION_PRUNING phase. Then ,once user issue count distinct queries , it will be translated to query the cache to get the result.

eg1: " select count,sum(a) ,count(distinct b) from t where dt=xx "
eg2:"select count,sum(a) ,count(distinct b) ,count(distinct c) from t where dt=xxx "
eg3:"select count(distinct b), count(distinct c) from t where dt=xxx"

eg1 will be right and have a query result as I expected , but eg2 will be wrong at the physical phase.The error info is here: https://gist.github.com/weijietong/1b8ed12db9490bf006e8b3fe0ee52269.
eg3 will also get the similar error.

Issue Links

• links to: GitHub Pull Request #889