oleg-zinovev commented on issue #1836: DRILL-7156: Support empty Parquet files 
URL: https://github.com/apache/drill/pull/1836#issuecomment-521174404
   Some time spent debugging the test showed that the last schema contains all 
fields. The field is added in ProjectRecordBatch#setupNewSchemaFromInput. 
   In the original version of the test, field A was not added due to plan 
optimization - condition `1=0` was replaced by` limit 0`
   I can still provide a solution with combining schema if required.

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