Samuel Yuan created HIVE-4067:
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Summary: Followup to HIVE-701: reduce ambiguity in grammar
Key: HIVE-4067
URL: https://issues.apache.org/jira/browse/HIVE-4067
Project: Hive
Issue Type: Bug
Components: Query Processor
Reporter: Samuel Yuan
Assignee: Samuel Yuan
Priority: Minor
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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