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September 21, 2026 07:09
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Which issue does this PR close?
Part of #4616.
Rationale for this change
Result comparisons can pass without exercising the intended JSON or cast execution path.
What changes are included in this PR?
Cover native opt-in, codegen dispatch, and Spark fallback for
from_json,to_json, and representative casts, with explicit routing and fallback-reason assertions.How are these changes tested?
Focused tests passed on Spark 3.5 and 4.1. Fork CI passed, including the default Spark 4.1 suites.