Cheng Hao created SPARK-4152:
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Summary: Avoid data change in CTAS while table already existed
Key: SPARK-4152
URL: https://issues.apache.org/jira/browse/SPARK-4152
Project: Spark
Issue Type: Bug
Components: SQL
Reporter: Cheng Hao
Priority: Minor
CREATE TABLE t1 (a String);
CREATE TABLE t1 AS SELECT key FROM src; -- throw exception
CREATE TABLE if not exists t1 AS SELECT key FROM src; -- expect do nothing,
actually will overwrite the t1.
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