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* Add within group variable to aggregate function and arguments * Support within group and disable null handling for ordered set aggregate functions (#13511) * Refactored function to match updated signature * Modify proto to support within group clause * Modify physical planner and accumulator to support ordered set aggregate function * Support session management for ordered set aggregate functions * Align code, tests, and examples with changes to aggregate function logic * Ensure compatibility with new `within_group` and `order_by` handling. * Adjust tests and examples to align with the new logic. * Fix typo in existing comments * Enhance test * Add test cases for changed signature * Update signature in docs * Fix bug : handle missing within_group when applying children tree node * Change the signature of approx_percentile_cont for consistency * Add missing within_group for expr display * Handle edge case when over and within group clause are used together * Apply clippy advice: avoids too many arguments * Add new test cases using descending order * Apply cargo fmt * Revert unintended submodule changes * Apply prettier guidance * Apply doc guidance by update_function_doc.sh * Rollback WITHIN GROUP and related logic after converting it into expr * Make it not to handle redundant logic * Rollback ordered set aggregate functions from session to save same info in udf itself * Convert within group to order by when converting sql to expr * Add function to determine it is ordered-set aggregate function * Rollback within group from proto * Utilize within group as order by in functions-aggregate * Apply clippy * Convert order by to within group * Apply cargo fmt * Remove plain line breaks * Remove duplicated column arg in schema name * Refactor boolean functions to just return primitive type * Make within group necessary in the signature of existing ordered set aggr funcs * Apply cargo fmt * Support a single ordering expression in the signature * Apply cargo fmt * Add dataframe function test cases to verify descending ordering * Apply cargo fmt * Apply code reviews * Uses order by consistently after done with sql * Remove redundant comment * Serve more clear error msg * Handle error cases in the same code block * Update error msg in test as corresponding code changed * fix --------- Co-authored-by: Jay Zhan <jayzhan211@gmail.com>