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https://issues.apache.org/jira/browse/SPARK-27765?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16843286#comment-16843286
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Xiao Li commented on SPARK-27765:
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{{::}} is historical PostgreSQL usage. Thus, we do not need to support it.
> Type Casts: expression::type
> -----------------------------
>
> Key: SPARK-27765
> URL: https://issues.apache.org/jira/browse/SPARK-27765
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Affects Versions: 3.0.0
> Reporter: Xiao Li
> Priority: Major
>
> [https://www.postgresql.org/docs/9.0/sql-expressions.html#SQL-SYNTAX-TYPE-CASTS]
> * A type cast specifies a conversion from one data type to another.
> PostgreSQL accepts two equivalent syntaxes for type casts:
> ** CAST ( expression AS type )
> ** expression::type
> * The {{CAST}} syntax conforms to SQL; the syntax with {{::}} is historical
> PostgreSQL usage.
>
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