Max Gekk created SPARK-57848:
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Summary: Support the TIME data type in approx_top_k
Key: SPARK-57848
URL: https://issues.apache.org/jira/browse/SPARK-57848
Project: Spark
Issue Type: Sub-task
Components: SQL
Affects Versions: 4.3.0
Reporter: Max Gekk
This sub-task is part of the umbrella SPARK-57550 (extend support for the TIME
data type).
h2. Problem
{{ApproxTopK}} (aggregate/ApproxTopKAggregates.scala) rejects {{TimeType}}:
{{isDataTypeSupported}} whitelist (~L227-234) excludes it, and
{{createItemsSketch}} / {{genSketchSerDe}} (~L246-260) have no TIME arm. Not
covered by SPARK-57557.
h2. Goal
Support {{TimeType}} in {{approx_top_k}}, keying the sketch on the nanos-of-day
{{Long}}.
h2. Scope
Add {{TimeType}} to {{isDataTypeSupported}} and to the sketch (de)serialization
paths; return TIME-typed items.
h2. Acceptance criteria
* {{approx_top_k}} over a TIME column returns correct top-k TIME values and
counts.
h2. Testing
The {{ApproxTopK}}-related suite.
h2. Dependencies
None - independent.
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