CTAS creates column names starting with "_" while the grammar does not allow
column names starting with "_"
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Key: HIVE-1254
URL: https://issues.apache.org/jira/browse/HIVE-1254
Project: Hadoop Hive
Issue Type: Bug
Reporter: Zheng Shao
Assignee: Ning Zhang
{code}
CREATE TABLE tmp_table AS
SELECT adid, min(timestamp)
FROM ads
GROUP BY adid;
{code}
The second column name is "_c1".
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