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Fix a reference error for window functions: In the function 'find_window_functions', the deduplication logic should be removed - Mailing list pgsql-hackers

From Meng Zhang
Subject Fix a reference error for window functions: In the function 'find_window_functions', the deduplication logic should be removed
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Msg-id CAErYLFAuxmW0UVdgrz7iiuNrxGQnFK_OP9hBD5CUzRgjrVrz=Q@mail.gmail.com
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Responses Re: Fix a reference error for window functions: In the function 'find_window_functions', the deduplication logic should be removed
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The deduplication logic won't cause an error when the result of this function is only used in `select_active_windows`. 
But when the result is used in `optimize_window_clauses`, it will cause the `winref` field of a certain window function to not be modified in the new window.
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