Hive: we should be able to specify a column without a table/alias name
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Key: HADOOP-4570
URL: https://issues.apache.org/jira/browse/HADOOP-4570
Project: Hadoop Core
Issue Type: Improvement
Components: contrib/hive
Reporter: Zheng Shao
"SELECT field1, field2 from table1" should work, just as "SELECT table1.field1,
table1.field2 from table1"
For join, the situation will be a bit more complicated. If the 2 join operands
have columns of the same name, then we should output an "ambiguity" error.
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