Inconsistent behavior with PostgreSQL to decide Window Expressions ordering

[mingmwang]

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DataFusion's current implement only checks the length of the sort exprs, and does not consider the column indexes, sort options(Asc/Desc and Nulls First/Nulls Last). The current implement claims to align with PG's rule but actually are not exactly matching.

See PG's source code select_active_windows and common_prefix_cmp
https://github.com/postgres/postgres/blob/master/src/backend/optimizer/plan/planner.c

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