fix(schema): reject spec-forbidden decimal scale changes in update_column#14
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abnobdoss wants to merge 3 commits into
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fix(schema): reject spec-forbidden decimal scale changes in update_column#14abnobdoss wants to merge 3 commits into
abnobdoss wants to merge 3 commits into
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added 3 commits
June 23, 2026 09:23
promote(DecimalType, ...) compared file_type.scale == file_type.scale (always True) instead of file_type.scale == read_type.scale, allowing update_column() to accept a forbidden decimal scale change. A scale decrease then makes scans crash with ArrowInvalid (table unreadable); a scale increase produces spec-violating metadata. Matches Java TypeUtil.isPromotionAllowed (scale must stay fixed, precision may widen).
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