Fixed point of origin for exponential decay window functions to the last value in window — backport of ClickHouse/ClickHouse#39593 #190
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Enmk
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Sep 17, 2022
…to the last value in window — backport of ClickHouse#39593 Fixed point of origin for exponential decay window functions to the last value in window. Fixed tests on Debug build type.
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Changelog entry (a user-readable short description of the changes that goes to CHANGELOG.md):
Fixed point of origin for exponential decay window functions to the last value in window. Previously, decay was calculated by formula
exp((t - curr_row_t) / decay_length), which is incorrect when right boundary of window is notCURRENT ROW. It was changed to:exp((t - last_row_t) / decay_length). There is no change in results for windows withROWS BETWEEN (smth) AND CURRENT ROW.Backport of ClickHouse#39593