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https://issues.apache.org/jira/browse/HIVE-14908?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15554436#comment-15554436
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Zoltan Haindrich commented on HIVE-14908:
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I've also tried 3.5.2 while I experimented with interval fixes..it didnt
helped in that neither ;)
But I was not sure about antlr upgrade preferences ... afaik antlr4 does syn
rules automatically..
So i think it might worth a try - I think i will try it.
Antlr4 has much better dev tooling support which would be useful during
development
althrough the removal of the optional reservation of these keywords will help -
but I think identifierparser should be split up
[~pxiong]
> Upgrade ANTLR to 3.5.2
> ----------------------
>
> Key: HIVE-14908
> URL: https://issues.apache.org/jira/browse/HIVE-14908
> Project: Hive
> Issue Type: Sub-task
> Reporter: Pengcheng Xiong
> Assignee: Pengcheng Xiong
> Attachments: HIVE-14908.01.patch
>
>
> Antlr v4 is also available but it does not support "->" which is widely used
> in our grammar. Antlr 3.5.2 is the latest v3 version. It will reduce the code
> size:
> {code}
> Here is summary of current parser code size
> 422345 HiveLexer.java
> 2436601 HiveParser.java
> 814184 HiveParser_FromClauseParser.java
> 2705920 HiveParser_IdentifiersParser.java
> 777665 HiveParser_SelectClauseParser.java
> After change, it will become
> 319589 HiveLexer.java
> 1853104 HiveParser.java
> 574156 HiveParser_FromClauseParser.java
> 1799195 HiveParser_IdentifiersParser.java
> 587305 HiveParser_SelectClauseParser.java
> {code}
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