fix: CteWorkTable: properly apply TableProvider::scan projection argument #18993
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It was previously ignored
Which issue does this PR close?
CteWorkTabledoes not properly apply projection #18992.Rationale for this change
All
TableProviderimplementations must support theprojectionargument of thescanmethod. This was not the case inCteWorkTable.What changes are included in this PR?
Minimal implementation of the projection support. The projection applied before the plan node return results. It might be nice to push it further inside of the recursion implementation to reduce memory consumption but I preferred to keep the fix minimal.
Are these changes tested?
I have not figured out yet a nice SQL query to trigger an error without this change. Some existing queries in
cte.slthave set projection (i.e. notNone) so the code is very likely working. Help on it welcome!