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https://issues.apache.org/jira/browse/SPARK-28146?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16871474#comment-16871474
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Yuming Wang commented on SPARK-28146:
-------------------------------------
{{IS OF}} does not conform to the ISO SQL behavior, so it is undocumented:
https://github.com/postgres/postgres/blob/REL_12_BETA1/doc/src/sgml/func.sgml#L518-L535
> Support IS OF (<type>) predicate
> --------------------------------
>
> Key: SPARK-28146
> URL: https://issues.apache.org/jira/browse/SPARK-28146
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Affects Versions: 3.0.0
> Reporter: Peter Toth
> Priority: Minor
>
> PostgreSQL supports IS OF (<type>) predicate, for example the following query
> is valid:
> {noformat}
> select 1 is of (int), true is of (bool)
> true true
> {noformat}
> I can't find PostgreSQL documentation about it, but here is how it works in
> Oracle:
>
> [https://docs.oracle.com/cd/B28359_01/server.111/b28286/conditions014.htm#SQLRF52157]
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