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From "Ramana Inukonda Nagaraj (JIRA)" <j...@apache.org>
Subject [jira] [Created] (DRILL-2262) selecting columns of certain datatypes from a parquet file created by drill fails
Date Wed, 18 Feb 2015 18:36:11 GMT
Ramana Inukonda Nagaraj created DRILL-2262:
----------------------------------------------

             Summary: selecting columns of certain datatypes from a parquet file created by
drill fails 
                 Key: DRILL-2262
                 URL: https://issues.apache.org/jira/browse/DRILL-2262
             Project: Apache Drill
          Issue Type: Bug
          Components: Storage - Parquet
            Reporter: Ramana Inukonda Nagaraj
            Assignee: Steven Phillips
            Priority: Critical


After creating a parquet file containing all datatypes using CTAS from drill certain columns
are not readable by doing a select in drill. 

These datatypes are :
DECIMAL18_col:       OPTIONAL INT64 O:DECIMAL R:0 D:1
TIME_col:            OPTIONAL INT32 O:TIME R:0 D:1
TIMESTAMP_col:       OPTIONAL INT64 O:TIMESTAMP R:0 D:1

The select from these columns fails with a similar error
{code}
0: jdbc:drill:> select DECIMAL18_col from parquet_all_default limit 1;
Query failed: RemoteRpcException: Failure while running fragment., org.apache.drill.exec.vector.NullableDecimal18Vector
cannot be cast to org.apache.drill.exec.vector.NullableBigIntVector [ 26094858-356a-4128-ba2a-aa1473f74c93
on 10.10.30.167:31010 ]
[ 26094858-356a-4128-ba2a-aa1473f74c93 on 10.10.30.167:31010 ]


Error: exception while executing query: Failure while executing query. (state=,code=0)

0: jdbc:drill:> select TIME_col from parquet_all_default limit 1;
Query failed: RemoteRpcException: Failure while running fragment., org.apache.drill.exec.vector.NullableTimeVector
cannot be cast to org.apache.drill.exec.vector.NullableIntVector [ 8938245b-a3a8-4bf2-8b6a-7e3860c90e8e
on 10.10.30.167:31010 ]
[ 8938245b-a3a8-4bf2-8b6a-7e3860c90e8e on 10.10.30.167:31010 ]


Error: exception while executing query: Failure while executing query. (state=,code=0)

0: jdbc:drill:> select TIMESTAMP_col from parquet_all_default limit 1;
Query failed: RemoteRpcException: Failure while running fragment., org.apache.drill.exec.vector.NullableTimeStampVector
cannot be cast to org.apache.drill.exec.vector.NullableBigIntVector [ 5dff5b38-ece7-4159-acfe-78dacb563e20
on 10.10.30.167:31010 ]
[ 5dff5b38-ece7-4159-acfe-78dacb563e20 on 10.10.30.167:31010 ]


Error: exception while executing query: Failure while executing query. (state=,code=0)
{code}

Note: Dictionary encoding is turned on by default as of commit : https://github.com/apache/drill/commit/00c08eff2a5de6e4334fb57e952aac9a852c3d37

After setting session options to turn off dictionary encoding the same queries succeed successfully.





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