608353c8e8
This PR adds a UnsafeArrayData, current we encode it in this way: first 4 bytes is the # elements then each 4 byte is the start offset of the element, unless it is negative, in which case the element is null. followed by the elements themselves an example: [10, 11, 12, 13, null, 14] will be encoded as: 5, 28, 32, 36, 40, -44, 44, 10, 11, 12, 13, 14 Note that, when we read a UnsafeArrayData from bytes, we can read the first 4 bytes as numElements and take the rest(first 4 bytes skipped) as value region. unsafe map data just use 2 unsafe array data, first 4 bytes is # of elements, second 4 bytes is numBytes of key array, the follows key array data and value array data. Author: Wenchen Fan <cloud0fan@outlook.com> Closes #7752 from cloud-fan/unsafe-array and squashes the following commits: 3269bd7 [Wenchen Fan] fix a bug 6445289 [Wenchen Fan] add unit tests 49adf26 [Wenchen Fan] add unsafe map 20d1039 [Wenchen Fan] add comments and unsafe converter 821b8db [Wenchen Fan] add unsafe array |
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