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From "Jesus Camacho Rodriguez (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HIVE-21278) Fix ambiguity in grammar warnings at compilation time
Date Wed, 20 Feb 2019 15:42:00 GMT

     [ https://issues.apache.org/jira/browse/HIVE-21278?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jesus Camacho Rodriguez updated HIVE-21278:
-------------------------------------------
       Resolution: Fixed
    Fix Version/s: 4.0.0
           Status: Resolved  (was: Patch Available)

Pushed to master, thanks for reviewing [~vgarg]!

> Fix ambiguity in grammar warnings at compilation time
> -----------------------------------------------------
>
>                 Key: HIVE-21278
>                 URL: https://issues.apache.org/jira/browse/HIVE-21278
>             Project: Hive
>          Issue Type: Bug
>          Components: Parser
>            Reporter: Jesus Camacho Rodriguez
>            Assignee: Jesus Camacho Rodriguez
>            Priority: Major
>             Fix For: 4.0.0
>
>         Attachments: HIVE-21278.01.patch, HIVE-21278.02.patch, HIVE-21278.patch
>
>
> These are the warnings at compilation time:
> {code}
> warning(200): org/apache/hadoop/hive/ql/parse/HiveParser.g:2439:5:
> Decision can match input such as "KW_CHECK KW_DATETIME" using multiple alternatives:
1, 2
> As a result, alternative(s) 2 were disabled for that input
> warning(200): org/apache/hadoop/hive/ql/parse/HiveParser.g:2439:5:
> Decision can match input such as "KW_CHECK KW_DATE {LPAREN, StringLiteral}" using multiple
alternatives: 1, 2
> As a result, alternative(s) 2 were disabled for that input
> warning(200): org/apache/hadoop/hive/ql/parse/HiveParser.g:2439:5:
> Decision can match input such as "KW_CHECK KW_UNIONTYPE LESSTHAN" using multiple alternatives:
1, 2
> As a result, alternative(s) 2 were disabled for that input
> warning(200): org/apache/hadoop/hive/ql/parse/HiveParser.g:2439:5:
> Decision can match input such as "KW_CHECK {KW_EXISTS, KW_TINYINT}" using multiple alternatives:
1, 2
> As a result, alternative(s) 2 were disabled for that input
> warning(200): org/apache/hadoop/hive/ql/parse/HiveParser.g:2439:5:
> Decision can match input such as "KW_CHECK KW_STRUCT LESSTHAN" using multiple alternatives:
1, 2
> As a result, alternative(s) 2 were disabled for that input
> {code}
> This means that multiple parser rules can match certain query text, possibly leading
to unexpected errors at parsing time.



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