[HIVE-21278] Fix ambiguity in grammar warnings at compilation time

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 3.2.0, 4.0.0-alpha-1
• Component/s: Parser
• Assignee: Jesús Camacho Rodríguez
• Reporter: Jesús Camacho Rodríguez
• Created: 15/Feb/19 23:21
• Updated: 27/Feb/24 22:23
• Resolved: 20/Feb/19 15:41

Description

These are the warnings at compilation time:

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

This means that multiple parser rules can match certain query text, possibly leading to unexpected errors at parsing time.

Issue Links

• is cloned by: HIVE-21293 Fix ambiguity in grammar warnings at compilation time (II)