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https://issues.apache.org/jira/browse/SPARK-33915?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17257025#comment-17257025
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Ted Yu commented on SPARK-33915:
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Opened https://github.com/apache/spark/pull/30984
> Allow json expression to be pushable column
> -------------------------------------------
>
> Key: SPARK-33915
> URL: https://issues.apache.org/jira/browse/SPARK-33915
> Project: Spark
> Issue Type: Improvement
> Components: Spark Core
> Affects Versions: 3.0.1
> Reporter: Ted Yu
> Priority: Major
>
> Currently PushableColumnBase provides no support for json / jsonb expression.
> Example of json expression:
> {code}
> get_json_object(phone, '$.code') = '1200'
> {code}
> If non-string literal is part of the expression, the presence of cast() would
> complicate the situation.
> Implication is that implementation of SupportsPushDownFilters doesn't have a
> chance to perform pushdown even if third party DB engine supports json
> expression pushdown.
> This issue is for discussion and implementation of Spark core changes which
> would allow json expression to be recognized as pushable column.
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