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Posted to issues@hive.apache.org by "David Mollitor (Jira)" <ji...@apache.org> on 2020/04/16 14:52:00 UTC

[jira] [Commented] (HIVE-23177) Upgrade to ANTLR4

    [ https://issues.apache.org/jira/browse/HIVE-23177?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17084941#comment-17084941 ] 

David Mollitor commented on HIVE-23177:
---------------------------------------

HIVE-15577 documents some of the limitations of ANTLR3 that Hive is starting to come up against.

> Upgrade to ANTLR4
> -----------------
>
>                 Key: HIVE-23177
>                 URL: https://issues.apache.org/jira/browse/HIVE-23177
>             Project: Hive
>          Issue Type: Improvement
>            Reporter: David Mollitor
>            Priority: Major
>
> Upgrade Hive to ANTL4, ANTLR3 lost support many moons ago.
> This is going to be a big lift.  Many of the Hive rules use the "rule rewrite" feature which no longer exists in ANLTR4 and it must be completely re-implemented:
> https://stackoverflow.com/questions/14565794/antlr-4-tree-inject-rewrite-operator



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