PS C:\Users\tibo\python_codes\pql> uv run t.py
relation.columns: ['foo', 'Foo']
to_arrow_table: ['foo', 'Foo']
pl.from_arrow: ['foo', 'Foo']
relation.pl eager: ['foo', 'Foo_1']
relation.pl lazy: ['foo', 'Foo']
pandas result: ['foo', 'Foo_1']
arrow query result: ['foo', 'Foo']
PS C:\Users\tibo\python_codes\pql> 

import duckdb
import polars as pl
rel = duckdb.from_query("select 1 as foo, 2 as Foo")
print("relation.columns:", rel.columns)
print("to_arrow_table:", rel.to_arrow_table().column_names)
print("pl.from_arrow:", pl.from_arrow(rel.to_arrow_table()).columns)
print("relation.pl eager:", rel.pl().columns)
print("relation.pl lazy:", rel.pl(lazy=True).collect().columns)
print("pandas result:", list(rel.df().columns))
print("arrow query result:", rel.to_arrow_reader().read_all().column_names)