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MDEV-25032: Window functions without column references get removed fr…
…om ORDER BY row_number() over () window function can be used without any column in the OVER clause. Additionally, the item doesn't reference any tables, as it's not effectively referencing any table. Rather it is specifically built based on the end temporary table used for window function computation. This caused remove_const function to wrongly drop it from the ORDER list. Effectively, we shouldn't be dropping any window function from the ORDER clause, so adjust remove_const to account for that. Reviewed by: Sergei Petrunia sergey@mariadb.com
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