Vinod KC created SPARK-58951:
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Summary: 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
`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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