[IMPALA-11286] Implement impala write 'values_counts' to Iceberg meta

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Resolved
• Fix Version/s: Impala 4.2.0
• Labels: impala-iceberg
• Epic Color: ghx-label-13
• Assignee: Li Penglin
• Reporter: Li Penglin
• Created: 10/May/22 03:02
• Updated: 25/Oct/22 09:26
• Resolved: 13/May/22 09:53

Description

Impala doesn't write 'value_counts', only 'null_value_counts'.

https://github.com/apache/impala/blob/1f20b7aa51b5c93dea03515423def2d800f43554/fe/src/main/java/org/apache/impala/service/IcebergCatalogOpExecutor.java#L316

'values_counts' is very helpful for pushing down NOT_NULL predicate, so we should implement impala write 'values_counts' to Iceberg Meta.