[IMPALA-4944] COMPUTE STATS on non-primitive columns

• Type: Improvement
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: Impala 2.9.0
• Component/s: Catalog
• Labels: catalog-server complextype statistics
• Epic Link: Complex types performance improvements
• Assignee: Unassigned
• Reporter: Miklos Szurap
• Created: 16/Feb/17 13:16
• Updated: 16/Mar/20 16:56

Description

Currently Impala does not compute the stats for complex-type columns, as per the docs:

Currently, the statistics created by the COMPUTE STATS statement do not include information about complex type columns. The column stats metrics for complex columns are always shown as -1. For queries involving complex type columns, Impala uses heuristics to estimate the data distribution within such columns.