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On the Documentation for Delta Transaction Protocol (https://github.com/delta-io/delta/blob/master/PROTOCOL.md#column-mapping), the column mapping section states as follows:

"There are two modes of column mapping, by name and by id. In both modes, every column - nested or leaf - is assigned a unique physical name, and a unique 32-bit integer as an id."

Why is it necessary to set up both the physical name and the integer id? If I'm using "name" mode, shouldn't unique physical names be enough to identify fields? Is because of any other feature or optimization?

Augusto Bernardi
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  • Yes, it should be, and that's what the text says, too. It says there are _two_ modes, one mode that maps by name, and one mode that maps by id. Nowhere does it mention both at the same time. – Mike 'Pomax' Kamermans Jul 10 '23 at 21:56

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