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Mike Bayer
0e41673ed4
which prevented referring to a CTE in a union
of itself without it being aliased.
CTEs now render uniquely
on name, rendering the outermost CTE of a given
name only - all other references are rendered
just as the name. This even includes other
CTE/SELECTs that refer to different versions
of the same CTE object, such as a SELECT
or a UNION ALL of that SELECT. We are
somewhat loosening the usual link between object
identity and lexical identity in this case.
A true name conflict between two unrelated
CTEs now raises an error.