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

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Details

Type: Improvement
Status: Open
Priority: Major
Resolution: Unresolved
Affects Version/s: Impala 2.9.0
Fix Version/s: None
Component/s: Catalog
Labels:

Epic Link:
Complex types performance improvements

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.