Module column_naming 

How a column reference names its field in the rows a clause reads.

A join’s merged rows key every field qualifier.column, so a clause read over them rewrites each column reference to its owning relation’s qualifier. A join aggregate’s group rows key fields by bare column name, so a clause read over them drops the qualifier.

Enums

BareColumn

Where an unqualified column reference resolves.

ColumnNaming

How a column reference to a relation of the scope names its field in the rows the clause reads.