I am generating select queries that include alias tables, literal columns,
renamed columns via label, multiple joins etc.
The queries can be somewhat complex and as a debugging feature, I'd like be
able to know which columns came from which tables...but I don't want to store
this information static and would like it to be derived from the query itself.
If the column is a literal column, constructed, or similar, then there is no
original table. If the table is used as part of an == join key, then the column
should be associated to each of the tables. So if doing three joins, a column
could have three original parent tables, etc.
So I'd like a mapping from columns to a list of tables. Example:
select a as aa, b, c, now() as d
from t1 inner join (select a, b, c from t3) t2
on t1.a == t2.a
This should say:
{aa : [t1, t3]
b : [t3]
c : [t3]
d : []}
But with proper sqlalchemy Column, Label, Table objects etc. Seems like this
should be possible, but I'm not familiar enough with traversing the trees.
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