Hello

Is it possible to replace a field in JdbcTableScan node of a logical  
relational tree with case RexNode without rebuilding the whole tree?

This functionality allows one to  investigate how some particular value affects 
final results  without changing database records.

The tricky thing is that the parent  expects the new RexNode to be in the same 
place in the list of fields. Renaming of old and new fields does not solve the 
problem. 

Any opinion or example would be greatly appreciated. 


Thanks,
Arkadi Shalaginov 

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