ycb_milvus_ce05e50e144a2

what a new run launched now would send

JSON path filter predicates currently treat parent JSON null, missing nested paths, incompatible path types, and invalid array paths inconsistently: some operators (especially inequality / `!=` and related `NOT` forms) treat those cases as a definite boolean, and raw evaluation, stats/index/cached bitmap paths, and `NOT` composition can disagree.

Reproduce by querying/filtering on nested JSON paths that are missing, JSON-null, or the wrong type (including under `!=` / `!~` and under `NOT`), and compare indexed/stats results vs brute-force/raw evaluation. Rows in those UNKNOWN cases must not count as definite matches, and inequality must not behave as “always true” when the path is absent or incomparable.

Align behavior with SQL-style three-valued logic so those cases preserve UNKNOWN consistently across the JSON predicate evaluation paths (including JSON contains/term/range-style predicates and `NOT`). When returning cached stats/index bitmap results, preserve validity bitmaps accordingly. Fix any parser rewrite that currently assumes scalar JSON missing-path `!=` is a definite true, and update tests that encoded the old definite-true/false expectations.

Work only inside this repository checkout. Make the code change the task
describes, keeping the diff focused — no drive-by refactors.

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