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https://issues.apache.org/jira/browse/SPARK-57557?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Max Gekk reassigned SPARK-57557:
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Assignee: Vabhav Garg (was: Max Gekk)
> Support the TIME data type in quantile and sketch aggregates
> ------------------------------------------------------------
>
> Key: SPARK-57557
> URL: https://issues.apache.org/jira/browse/SPARK-57557
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Affects Versions: 4.3.0
> Reporter: Max Gekk
> Assignee: Vabhav Garg
> Priority: Major
> Labels: pull-request-available
> Fix For: 4.3.0
>
>
> h2. What
> Allow {{TimeType}} as input to the quantile/sketch aggregate functions:
> {{percentile}}, {{percentile_approx}} / {{approx_percentile}}
> ({{ApproximatePercentile}}),
> {{median}}, {{histogram_numeric}} ({{HistogramNumeric}}), and the
> datasketches aggregates.
> h2. Why
> These functions currently accept NumericType, DateType, TimestampType,
> TimestampNTZType and
> intervals, but not {{TimeType}} (see {{ApproximatePercentile.inputTypes}}).
> TIME is an
> ordered datetime type with a {{Long}} internal value, so percentiles/medians
> are well
> defined and consistent with how TIMESTAMP is already handled.
> h2. Scope
> * Add {{TimeType}} to the {{inputTypes}}/{{TypeCollection}} of the affected
> aggregates.
> * Add the {{TimeType}} branches in the value<->double conversions (the
> internal value is a
> {{Long}}, same as TIMESTAMP/DayTimeInterval).
> * Datasketches aggregates: include {{TimeType}} in the supported-types list
> (note the existing "implement support for decimal/datetime/interval types"
> TODO).
> * Return type for a TIME percentile/median is {{TimeType}} (matching the
> TIMESTAMP behavior).
> h2. Acceptance criteria
> * {{percentile}}, {{percentile_approx}}, {{median}}, {{histogram_numeric}}
> work on TIME
> columns and return TIME.
> * Tests added alongside the existing datetime aggregate tests.
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