arina-ielchiieva commented on issue #1836: DRILL-7156: Support empty Parquet 
files creation
URL: https://github.com/apache/drill/pull/1836#issuecomment-521191646
 
 
   > @arina-ielchiieva
   > 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.
   
   This case we don't need schema merge,

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