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https://issues.apache.org/jira/browse/HIVE-16074?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16389325#comment-16389325
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靳峥 commented on HIVE-16074:
---------------------------
thanks [~pxiong]
> Parser can not deal with complex sql
> ------------------------------------
>
> Key: HIVE-16074
> URL: https://issues.apache.org/jira/browse/HIVE-16074
> Project: Hive
> Issue Type: Bug
> Components: Parser
> Affects Versions: 2.1.1
> Reporter: 靳峥
> Assignee: Pengcheng Xiong
> Priority: Major
> Fix For: 2.3.0
>
> Original Estimate: 12h
> Remaining Estimate: 12h
>
> Parser will stuck when parsing the sql into ast, eg:
> select
> intType,floatType,stringType,varchar32Type,byteType,shortType,dateType,timestampType,longType
> , max(intType | 0) from orctest where
> ((((((((((((((((((((((((((((((((((((((1=2)) and ((1=1))) or (((2=2)) and
> ((1=2)))) and (((1=1)) or ((0=0)))) or (((1=0)) or ((1=2)))) or (((1=1)) or
> ((0=0)))) or (((1=1)) and ((0=0)))) or (((2=2)) or ((2=2)))) and (((2=2)) or
> ((2=2)))) and (((2=2)) or ((1=2)))) or (((0=0)) and ((1=0)))) or (((1=1)) and
> ((1=2)))) or (((1=1)) and ((2=2)))) or (((1=2)) and ((1=1)))) or (((1=1)) and
> ((2=2)))) or (((1=1)) or ((1=1)))) and (((0=0)) and ((0=0)))) or (((0=0)) or
> ((1=2)))) and (((1=2)) and ((1=1)))) and (((0=0)) or ((2=2)))) or (((1=2)) or
> ((2=2)))) and (((0=0)) and ((1=2)))) or (((1=2)) or ((1=0)))) or (((2=2)) or
> ((1=0)))) or (((2=2)) or ((1=2)))) or (((1=2)) or ((1=1)))) and (((1=2)) or
> ((1=2)))) and (((1=0)) or ((2=2)))) and (((2=2)) or ((1=0)))) and (((1=2)) or
> ((1=1)))) and (((1=2)) or ((1=2)))) and (((2=2)) and ((1=0)))) and (((2=2))
> or ((1=1)))) or (((0=0)) and ((1=1)))) and (((2=2)) or ((1=2)))) and (((1=2))
> or ((0=0)))) or (((1=0)) and ((1=1)))) or (((1=1)) and ((1=2))) group by
> intType,floatType,stringType,varchar32Type,byteType,shortType,dateType,timestampType,longType;
> The jvm of Server was working fine, with continues minor gc.
> The cpu kept 100%.
> It means the java logic generated by antlr is too complex.
> The way to solve the problem may be optimize the syntax file or update the
> version of antlr.
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