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https://issues.apache.org/jira/browse/SPARK-12855?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15197064#comment-15197064
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Apache Spark commented on SPARK-12855:
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User 'adrian-wang' has created a pull request for this issue:
https://github.com/apache/spark/pull/11758
> Remove parser pluggability
> --------------------------
>
> Key: SPARK-12855
> URL: https://issues.apache.org/jira/browse/SPARK-12855
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Reporter: Reynold Xin
> Assignee: Reynold Xin
> Fix For: 2.0.0
>
>
> This pull request removes the public developer parser API for external
> parsers. Given everything a parser depends on (e.g. logical plans and
> expressions) are internal and not stable, external parsers will break with
> every release of Spark. It is a bad idea to create the illusion that Spark
> actually supports pluggable parsers. In addition, this also reduces
> incentives for 3rd party projects to contribute parse improvements back to
> Spark.
> The number of applications that are using this feature is small (as far as I
> know it came down from two to one as of Jan 2016, and will be 0 once we have
> better ansi SQL support).
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