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det: SQLCODE -180 for a null-date update, not the driver's -4220 (#4658) - #4672
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…part from spaces in the COMMAREA (#4635) Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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Conflict: equivalence_cics.compare_task_sysout takes main's (#4660's own change). det_sweep_baseline.json keeps this PR's removal of cbsa-xfrfun (git's merge silently restored main's entry). Evidence reports regenerated (evidence_report.py --refresh). Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01MQNoe4wPJgr7dbUvs3DG6D
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Conflict in Gen's COMPUTE: keep #4685's p_scaled_expr refusal (first) and this PR's ARITHMETIC-OSVS plan around the expression. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01MQNoe4wPJgr7dbUvs3DG6D
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Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01MQNoe4wPJgr7dbUvs3DG6D
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Fixes #4658. Stacked on #4660 — merge that first.
DetSql mapped the IBM JDBC driver's client-side -4220 (conversion error on an unset, non-date host variable) straight into SQLCA. Db2 never returns -4220 to an embedded-SQL program: the server's verdict, on Db2 LUW and z/OS alike, is -180 / SQLSTATE 22007 (string is not a valid datetime value). DetSql now maps -4220 to -180/22007; other driver errors are unchanged. Recorded as oracle_assumptions Q1b.
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