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[SPARK-21896][SQL] Fix StackOverflow caused by window functions insid…
…e aggregate functions ## What changes were proposed in this pull request? This PR explicitly prohibits window functions inside aggregates. Currently, this will cause StackOverflow during analysis. See PR #19193 for previous discussion. ## How was this patch tested? This PR comes with a dedicated unit test. Author: aokolnychyi <[email protected]> Closes #21473 from aokolnychyi/fix-stackoverflow-window-funcs.
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