Jerry Hu 4088359429 [fix](be) Reset quantile union state for empty window frames (#69964) ...

### What problem does this PR solve?

Issue Number: N/A

Related PR: N/A

Problem Summary: A bounded ROWS window can become empty after a nonempty
frame. The `quantile_union` reset previously restored only the
first-input flag and retained the preceding `QuantileState`. Without a
subsequent value to merge, an empty or NULL-only frame returned the
preceding frame's quantiles. Reset both the first-input flag and the
stored samples before each frame. The logical reset retains explicit
sample-vector capacity for reuse, while `clear()` preserves its
storage-release behavior.

### Release note

Fix `quantile_union` over empty window frames: `quantile_percent` now
returns NaN instead of values from the preceding frame.

### Check List (For Author)

- Test: ASAN BE unit tests (47 passed); ASAN BE+FE build (including FE
Checkstyle); three isolated SQL regression suites (1 suite passed each);
clang-format, format check, build hygiene, changed-line clang-tidy (no
warnings), and diff check. No performance benchmark was run.
- Behavior changed: Yes (empty window frames no longer inherit the
preceding quantile state).
- Does this need documentation: No.

2026-11-03 11:46:56 +08:00

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aggregate

[fix](be) Reset quantile union state for empty window frames (#69964)

2026-11-03 11:46:56 +08:00

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