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Fix #1219: harden pushdown null-safety keyword scanning - #1281
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Summary
is_null_rejecting()by masking quoted/backticked segments before null-safe/operator substring scans'x is not null','coalesce(')Validation
python -B -m pytest -q graphistry/tests/compute/gfql/test_pushdown_safety.py graphistry/tests/compute/gfql/test_predicate_pushdown_pass.pypython -B -m pytest -q graphistry/tests/compute/gfql/cypher/test_where_bool_conformance.py -k "PushdownExprShape"uv run ruff check graphistry/compute/gfql/ir/pushdown_safety.py graphistry/tests/compute/gfql/test_pushdown_safety.py graphistry/tests/compute/gfql/test_predicate_pushdown_pass.pyUV_CACHE_DIR=/tmp/uv-cache MYPY_CMD='uv run mypy' MYPY_CACHE_DIR=/tmp/mypy-cache ./bin/mypy.sh graphistry/compute/gfql/ir/pushdown_safety.py