[feature](function) support nth_value window function#50559
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TPC-H: Total hot run time: 33702 ms |
TPC-DS: Total hot run time: 192571 ms |
ClickBench: Total hot run time: 29.03 s |
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BE UT Coverage ReportIncrement line coverage Increment coverage report
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BE Regression && UT Coverage ReportIncrement line coverage Increment coverage report
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TPC-H: Total hot run time: 34618 ms |
TPC-DS: Total hot run time: 185549 ms |
ClickBench: Total hot run time: 29.23 s |
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BE UT Coverage ReportIncrement line coverage Increment coverage report
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BE Regression && UT Coverage ReportIncrement line coverage Increment coverage report
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BiteTheDDDDt
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May 22, 2025
koarz
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Jun 4, 2025
### What problem does this PR solve? Problem Summary: doc: apache/doris-website#2350 support nth_value window function nth_value(column, offset), offset is positive number
morrySnow
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Jun 26, 2026
### What problem does this PR solve? Related PR: #50559 Problem Summary: nth_value over an upper-bounded/lower-unbounded window frame such as ROWS BETWEEN CURRENT ROW AND UNBOUNDED FOLLOWING is normalized by reversing the order and frame, then evaluating nth_value with a negative offset over a cumulative frame. The BE nth_value window state replaced the tracked frame row count on each range update, so later rows in the cumulative frame could address the wrong row or return NULL. The fix keeps the cumulative frame row count across range updates, and FE preserves literal offset typing when negating bigint nth_value arguments. This adds BE unit coverage for the reversed cumulative execution path and a regression case comparing nth_value to lead for the original SQL frame. ### Release note Fix nth_value results for ROWS BETWEEN CURRENT ROW AND UNBOUNDED FOLLOWING window frames.
github-actions Bot
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Jun 26, 2026
### What problem does this PR solve? Related PR: #50559 Problem Summary: nth_value over an upper-bounded/lower-unbounded window frame such as ROWS BETWEEN CURRENT ROW AND UNBOUNDED FOLLOWING is normalized by reversing the order and frame, then evaluating nth_value with a negative offset over a cumulative frame. The BE nth_value window state replaced the tracked frame row count on each range update, so later rows in the cumulative frame could address the wrong row or return NULL. The fix keeps the cumulative frame row count across range updates, and FE preserves literal offset typing when negating bigint nth_value arguments. This adds BE unit coverage for the reversed cumulative execution path and a regression case comparing nth_value to lead for the original SQL frame. ### Release note Fix nth_value results for ROWS BETWEEN CURRENT ROW AND UNBOUNDED FOLLOWING window frames.
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What problem does this PR solve?
Problem Summary:
doc: apache/doris-website#2350
support nth_value window function
nth_value(column, offset), offset is positive number
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