caofangkun created HIVE-4671:
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Summary: When HiveQL WHERE clause is a constant value or a single
column name , it should be handled in reason
Key: HIVE-4671
URL: https://issues.apache.org/jira/browse/HIVE-4671
Project: Hive
Issue Type: Bug
Components: Query Processor
Affects Versions: 0.12.0
Reporter: caofangkun
Assignee: caofangkun
Priority: Minor
User can specify any condition using WHERE clause.
This clause is used to compare given value with the field value available in
Hive table .
Generally speaking WHERE condition should be key-value pairs like `column_name
= 'const value' and ....` .
But the followwing three statements shoud also be handled in reason.
Statement One: WHERE condition is a boolean value
the following two queries work well but should optimized as non-MR fetching
SELECT * FROM src WHERE true;
SELECT * FROM src WHERE false;
Statement One: WHERE condition is a single constat value
the following two queries will generate RunTime ClassCastException
Should this to be optimized as "if Integer not equal to 0 then TRUE else FALSE
" ?
SELECT * FROM src WHERE 1;
SELECT * FROM src WHERE 0;
SELECT * FROM src WHERE -1;
Statement One: WHERE condition is a single column name
the following two query will generate RunTime ClassCastException too .
Should this to be optimized as SemanticException ?
SELECT * FROM src WHERE key;
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