docs: Clarify first_value usage in select vs aggregate #1348
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Clarifies that aggregate functions like first_value must be used within .aggregate() and not .select(). Closes apache#1300.
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I investigated Issue #1300 and confirmed that the crash occurs because first_value (an aggregate function) is used inside .select(), which is not supported by the physical planner. This PR updates the docstring to explicitly warn users that first_value should be used with .aggregate() and not .select(). Closes #1300.