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* feat(partition): add expression split utility Implement MVP split logic with checker-safe degrade paths and move module under utils/split with aligned split naming and tests. Signed-off-by: WenyXu <wenymedia@gmail.com> * refactor: minor Signed-off-by: WenyXu <wenymedia@gmail.com> * chore: header Signed-off-by: WenyXu <wenymedia@gmail.com> * chore: styling Signed-off-by: WenyXu <wenymedia@gmail.com> * fix(partition): degrade split when branch becomes unsatisfiable Detect empty conjunction branches after split and return EmptyBranch instead of silently succeeding. This keeps split behavior aligned with expected partition semantics and adds regression tests for contradictory cuts. Signed-off-by: WenyXu <wenymedia@gmail.com> * fix(partition): tighten empty-branch split detection Handle Eq/NotEq contradictions and discrete-gap unsatisfiable ranges in split empty-branch checks. Add regression tests for equality conflicts and impossible int/date intervals. Signed-off-by: WenyXu <wenymedia@gmail.com> * fix(partition): degrade singleton and uint impossible split branches Signed-off-by: WenyXu <wenymedia@gmail.com> * fix(partition): enforce finite float bounds in split degradation Signed-off-by: WenyXu <wenymedia@gmail.com> * fix(partition): drop date and timestamp support from expr split Signed-off-by: WenyXu <wenymedia@gmail.com> * fix(partition): reject nan and infinity in expr split Signed-off-by: WenyXu <wenymedia@gmail.com> * refactor(partition): reuse conjunction bound collection in expr split Signed-off-by: WenyXu <wenymedia@gmail.com> * chore: fmt Signed-off-by: WenyXu <wenymedia@gmail.com> * chore: add comments Signed-off-by: WenyXu <wenymedia@gmail.com> * fix(partition): respect null-first semantics in empty branch checks Signed-off-by: WenyXu <wenymedia@gmail.com> * refactor(partition): restrict expr split to range-only shapes Signed-off-by: WenyXu <wenymedia@gmail.com> * docs(partition): clarify split helper scope and test names Signed-off-by: WenyXu <wenymedia@gmail.com> * chore: add comments Signed-off-by: WenyXu <wenymedia@gmail.com> --------- Signed-off-by: WenyXu <wenymedia@gmail.com>