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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