Hello,
today I have discovered a strange side-effect of a query flattener.

Imagine a query like "SELECT A.F1, B1.F FROM A JOIN (SELECT F2 AS F FROM B 
WHERE F3=0) B1". If the query flattener is active the result-set has columns 
"A.F1" and "B1.F". If it is disabled the result-set columns are "F1" and "F". 
The "short_column_names" option is set.

I thought the optimization used, would not change the result-set column names. 
Was I wrong?

Best regards
Joe

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