Introduce LimitK optimization in TopK scenario when using window function.#17208

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Sh-Zh-7 wants to merge 4 commits intomasterfrom

perf/szh/window_func_limit_k_optimize

Commits on Feb 19, 2026

Limit K optimization for window function prototype.
Sh-Zh-7
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Commits on Feb 20, 2026

Fix pushdown error in row number operator.
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Fix window function ORDER BY time while outer query ORDER BY time DESC do not work bug.
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Commits on Feb 21, 2026

Support rank function in `canUseLimitKRanking`.
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