Github user cloud-fan commented on a diff in the pull request: https://github.com/apache/spark/pull/20450#discussion_r165242401 --- Diff: sql/core/src/main/java/org/apache/spark/sql/execution/vectorized/OffHeapColumnVector.java --- @@ -530,7 +530,7 @@ public int putByteArray(int rowId, byte[] value, int offset, int length) { @Override protected void reserveInternal(int newCapacity) { int oldCapacity = (nulls == 0L) ? 0 : capacity; - if (isArray()) { + if (isArray() || type instanceof MapType) { --- End diff -- This might be an overkill, `isArray` needs to take care of many types, but `isMap` we only accept one type: MapType.
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