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