[jira] [Created] (DRILL-982) Parquet reader should return NULL value in execution phase, in stead of raising ExecutionSetupException

["Jinfeng Ni (JIRA)" <ji...@apache.org>]

Jinfeng Ni created DRILL-982:
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             Summary: Parquet reader should return NULL value in execution phase, in stead of raising ExecutionSetupException
                 Key: DRILL-982
                 URL: https://issues.apache.org/jira/browse/DRILL-982
             Project: Apache Drill
          Issue Type: Bug
            Reporter: Jinfeng Ni
            Assignee: Jason Altekruse


If query a non-exist column against a parquet file, DRILL currently raise ExecutionSetupException:

SELECT  NON_EXIT_COLUMN from cp.`tpch/nation.parquet`;

This will cause problem, when we have multiple parquet files, and the first one does not have the column, while the rest of them have the column.  
 
It would be better to return NULL expression during execution stage, if the columns does not exist in the parquet file. 

Later on, if DRILL adds a new option to verify column existence before executing a query ( just like what a schema-based system will do), we could throw PlanException in planning phase, once the parquet footer information is available to planner. 






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