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When merging columnar batches with different field sets, missing columns were skipped entirely — creating misaligned arrays where some columns had fewer elements than the time column. This caused data corruption when the server received uneven column lengths. Fix: pad missing columns with None values so all columns have equal length. MessagePack serializes None as nil, which the Arc server now handles correctly with validity bitmaps. Related: Basekick-Labs/arc#202
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When merging columnar batches with different field sets, missing columns were skipped entirely — creating misaligned arrays where some columns had fewer elements than the time column. This caused data corruption when the server received uneven column lengths.
Fix: pad missing columns with None values so all columns have equal length. MessagePack serializes None as nil, which the Arc server now handles correctly with validity bitmaps.
Related: Basekick-Labs/arc#202