Bind definitions to the names the warehouse reported - #283
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A definition's expression names the columns the author wrote, and a catalog import re-keys the dictionary to what the warehouse reported, so the expression is rewritten before it is lowered: column paths in the IR and in a COLUMNS(...) selection take the discovered spelling, references to sibling definitions are left for composition, and an authored column the relation does not have is refused rather than emitted. An authored table with definitions that matched no selected relation is refused too, since dropping it would leave the agent told about a governed definition that is not there.
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Seventh of the catalog import stack (kata xp65), and the last of it. Stacked on #282. Python only.
A definition's expression names the columns the author wrote. A catalog import re-keys the dictionary to what the warehouse reported, which on Snowflake means upper case, so the expression has to be rewritten before it is lowered or the SQL would name columns the warehouse does not have. This is the catalog column binding that f6hz deferred to xp65.
Column paths in the IR and in a
COLUMNS(...)selection take the discovered spelling. A reference to a sibling definition is a name in the dictionary rather than a column in the warehouse, so it is left for composition to inline. An authored column the relation does not have is refused rather than emitted, and so is an authored table with definitions that matched no selected relation, since dropping it would leave the agent told about a governed definition that is not there.DefinitionExport.columns, the list of columns a definition reads, keeps the authored spelling. It describes the dictionary the author wrote, and the R implementation leaves it the same way.This replaces the temporary refusal the previous PR shipped.
Verification
733 Python tests, ruff and pyrefly clean.