Reject incomplete JRuby cursor responses - #158
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Summary
Return
nilunless JRuby's cursor query receives a terminating response with exactly two coordinates.Reproduction
Focused external cursor models feed EOF and incomplete single-coordinate responses. Current code returns partial/decremented arrays; the candidate rejects them.
Verification
Compatibility
Valid row/column responses are unchanged. JRuby was modeled but is unavailable locally; current upstream CI is green on JRuby. Prepared with AI-assisted source review; no repository tests were changed.