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https://issues.apache.org/jira/browse/SPARK-58951?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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ASF GitHub Bot updated SPARK-58951:
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Labels: pull-request-available (was: )
> Support non-binary collations in collect_set
> --------------------------------------------
>
> Key: SPARK-58951
> URL: https://issues.apache.org/jira/browse/SPARK-58951
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Affects Versions: 4.4.0
> Reporter: Vinod KC
> Priority: Major
> Labels: pull-request-available
>
> `collect_set` currently rejects non-binary collated string inputs with an
> UNSUPPORTED_INPUT_TYPE error:
>
> {code:java}
> CREATE OR REPLACE TEMP VIEW v AS
> SELECT CAST(s AS STRING COLLATE UTF8_LCASE) AS s
> FROM VALUES ('foo'), ('FOO'), ('bar') AS raw(s);
> SELECT collect_set(s) FROM v;
> -- [DATATYPE_MISMATCH.UNSUPPORTED_INPUT_TYPE] ... collect_set ...
> {code}
>
> `collect_set` should support collated strings and return one representative
> per collation-equal group.
> For the view above, 'foo' and 'FOO' are equal under UTF8_LCASE, so the result
> should have 2 elements.
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