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https://issues.apache.org/jira/browse/HIVE-14908?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15554267#comment-15554267
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Pengcheng Xiong commented on HIVE-14908:
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Thanks for [~ekoifman]'s suggestion. However, it is still not enough if we
would like to support set operator without "distinct" keywords. We still need
to drop the configuration for SQL2011 keywords used as identifier. ccing
[~ashutoshc] and [~alangates]
> 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
>
> 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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