* feat: Preserve number of streams after evaluation the window functions to allow parallel stream processing
* fix style
* fix style
* fix style
* setting query_plan_preserve_num_streams_after_window_functions default true
* fix tests by SETTINGS query_plan_preserve_num_streams_after_window_functions=0
* fix test references
* Resize the streams after the last window function, to keep the order between WindowTransforms (and WindowTransform works on single stream anyway).
* feat: Preserve number of streams after evaluation the window functions to allow parallel stream processing
* fix style
* fix style
* fix style
* setting query_plan_preserve_num_streams_after_window_functions default true
* fix tests by SETTINGS query_plan_preserve_num_streams_after_window_functions=0
* fix test references
* Resize the streams after the last window function, to keep the order between WindowTransforms (and WindowTransform works on single stream anyway).
* add perf test
* perf: change the dataset from 50M to 5M
* rename query_plan_preserve_num_streams_after_window_functions -> query_plan_enable_multithreading_after_window_functions
* update test reference
* fix clang-tidy
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Co-authored-by: Nikita Taranov <nikita.taranov@clickhouse.com>
