Github user cloud-fan commented on the issue: https://github.com/apache/spark/pull/13680 see https://github.com/apache/spark/pull/13680#discussion_r74798477 We'd like to change the format to: [numElements] [null bits] [offset or primitive values] [values] in the `[offset or primitive values]`, we store the primitive values directly, or store length and offset for variable length element, like `UnsafeRow` in the `[values]`, we always align each element to 8 bytes.
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