DIfference b/w expression builder logical column and derived logical column

Hi Experts,
Can anyone tellme the difference between expression builder (when we double click the logical column) of derived logical column and expression builder of logical column( we see this in column mapping of LTS) ??
Thanks in advance.

Hi,
Formula given in the "expression builder of logical column( we see this in column mapping of LTS)" is performed on the physical layer of the RPD. I guess it is calculated in the Physical Query which is good for performance.
Formula in the expression builder of derived column is calculated in the BMM layer i.e in the logical query.
Regards,
Amrutha.

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