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From "Ashutosh Chauhan (JIRA)" <>
Subject [jira] [Commented] (HIVE-4067) Followup to HIVE-701: reduce ambiguity in grammar
Date Tue, 12 Mar 2013 20:41:12 GMT


Ashutosh Chauhan commented on HIVE-4067:

Can you expand a bit on what was the motivation for HIVE-701. SQL standard 2003
lists many keywords as reserved, which we don't consider reserved anymore. We should strive
to be standard compliant.
> Followup to HIVE-701: reduce ambiguity in grammar
> -------------------------------------------------
>                 Key: HIVE-4067
>                 URL:
>             Project: Hive
>          Issue Type: Bug
>          Components: Query Processor
>    Affects Versions: 0.11.0
>            Reporter: Samuel Yuan
>            Assignee: Samuel Yuan
>            Priority: Minor
>         Attachments: HIVE-4067.D8883.1.patch
> After HIVE-701 the grammar has become much more ambiguous, and the compilation generates
a large number of warnings. Making FROM, DISTINCT, PRESERVE, COLUMN, ALL, AND, OR, and NOT
reserved keywords again reduces the number of warnings to 134, up from the original 81 warnings
but down from the 565 after HIVE-701. Most of the remaining ambiguity is trivial, an example
being "KW_ELEM_TYPE | KW_KEY_TYPE | KW_VALUE_TYPE | identifier", and they are all correctly
handled by ANTLR.

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