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From cloud-fan <>
Subject [GitHub] spark issue #13909: [SPARK-16213][SQL] Reduce runtime overhead of a program ...
Date Fri, 18 Nov 2016 11:51:06 GMT
Github user cloud-fan commented on the issue:
    I'd like to introduce a new expression: `CreatePrimitiveArray`. In the optimizer if we
find the element type is primitive type, replace `CreateArray` with `CreatePrimitiveArray`.
    BTW, we don't need to require all expressions to be non-nullable, we can just put a default
value to the primitive array if that element is null, and call `UnsafeArrayData.setNullAt`
later. (we need to implement ArrayData.setNullAt though)

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