Pavel Grafkin created IMPALA-7045:
-------------------------------------

             Summary: CTAS doesn't allow NULL values
                 Key: IMPALA-7045
                 URL: https://issues.apache.org/jira/browse/IMPALA-7045
             Project: IMPALA
          Issue Type: Bug
         Environment: impalad version 2.7.0-cdh5.10.0 RELEASE (build 
785a073cd07e2540d521ecebb8b38161ccbd2aa2)
Built on Fri Jan 20 12:03:56 PST 2017
            Reporter: Pavel Grafkin


When I run following:

{{CREATE TABLE temp_test AS SELECT CAST(null AS bigint) as nullable_int }}

with the error:

{{Unsupported type 'null_type' in column 'nullable_int' of table 'temp_test'}}

The reason for this, I assume, is following. In the INSERT statements data 
types of result set's columns are retrieved from the resulting values:
[https://github.com/apache/impala/blob/789c5aac23480acc6e18c057b767b65fdd791c97/fe/src/main/java/org/apache/impala/analysis/InsertStmt.java#L275]

Whereas in CTAS they are calculated via base table of the column (and there is 
no base table for NULL):
[https://github.com/apache/impala/blob/ba84ad03cb83d7f7aed8524fcfbb0e2cdc9fdd53/fe/src/main/java/org/apache/impala/analysis/CreateTableAsSelectStmt.java#L171]

 



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