fix issue where merge fails because source and target have different columns - #264
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Pull request overview
This PR addresses a Delta MERGE failure in the inpatients raw-data pipeline when the source DataFrame schema differs from the existing target Delta table schema (e.g., new columns appear in the source before they exist in the target).
Changes:
- Removes the conditional
whenMatchedUpdateAll(...)predicate to avoid referencing target columns that may not yet exist during schema evolution. - Makes matched-row updates unconditional during the merge.
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yiwen-h
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Jun 17, 2026
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Thank you - we talked through this on a call
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