Fix select_dtypes for quoted column identifiers #242
Merged
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Fixes duckdb/duckdb#20329
DuckDBPyRelation.select_dtypesfailed for relations with column names thatrequire quoting (e.g., names containing spaces). The projection builder did
not correctly quote identifiers, leading to binder errors.
This change ensures identifiers are quoted consistently and adds a regression
test to cover the reported case.