[jira] [Created] (HIVE-21293) Fix ambiguity in grammar warnings at compilation time (II)

["Jesus Camacho Rodriguez (JIRA)" <ji...@apache.org>]

Jesus Camacho Rodriguez created HIVE-21293:
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             Summary: Fix ambiguity in grammar warnings at compilation time (II)
                 Key: HIVE-21293
                 URL: https://issues.apache.org/jira/browse/HIVE-21293
             Project: Hive
          Issue Type: Bug
          Components: Parser
            Reporter: Jesus Camacho Rodriguez
            Assignee: Jesus Camacho Rodriguez


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
warning(200): IdentifiersParser.g:424:5:
Decision can match input such as "KW_UNKNOWN" using multiple alternatives: 1, 10

As a result, alternative(s) 10 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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