Pengcheng Xiong created HIVE-14908:
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Summary: 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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