Max Gekk created SPARK-57824:
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Summary: Support nanosecond-precision timestamps in
approx_count_distinct_for_intervals and approx_top_k
Key: SPARK-57824
URL: https://issues.apache.org/jira/browse/SPARK-57824
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-56822 (timestamps with nanosecond
precision).
h2. Problem
{{ApproxCountDistinctForIntervals}}
(aggregate/ApproxCountDistinctForIntervals.scala ~L69-148) and {{ApproxTopK}}
(aggregate/ApproxTopKAggregates.scala ~L229-231 and related) list only
microsecond timestamp types in their supported/input types and convert
timestamps via {{Long}}.
h2. Goal
Accept {{AnyTimestampNanoType}} and handle {{TimestampNanosVal}} in the sketch
update/estimation paths.
h2. Scope
Extend the supported-type lists; add nanosecond value handling (map to a
comparable/hashable key preserving the remainder).
h2. Acceptance criteria
* Both aggregates run over NTZ/LTZ nanosecond timestamps and produce results
consistent with the microsecond behavior.
h2. Testing
The respective aggregate suites; nanos golden files.
h2. Dependencies
None - independent.
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