[IMPALA-7748] Remove the appx_count_distinct query option

• Type: Improvement
• Status: Resolved
• Priority: Minor
• Resolution: Not A Problem
• Affects Version/s: Impala 3.1.0
• Epic Color: ghx-label-5
• Assignee: Unassigned
• Reporter: Thomas Tauber-Marshall
• Created: 23/Oct/18 20:30
• Updated: 25/Oct/18 22:05
• Resolved: 25/Oct/18 22:05

Description

With IMPALA-110, we can now support multiple count distinct directly, and the appx_count_distinct query option is no longer needed. Users who want the perf improvement from it can always just use the ndv() function directly in their sql.

We'll mark this option as deprecated in the docs starting from 3.1. Removing it can be targeted for 4.0