spark技术分享OffHeapColumnVector
OffHeapColumnVector is a concrete WritableColumnVector that…FIXME
Allocating Column Vectors — allocateColumns Static Method
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OffHeapColumnVector[] allocateColumns(int capacity, StructType schema) (1) OffHeapColumnVector[] allocateColumns(int capacity, StructField[] fields) |
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Simply converts
StructTypetoStructField[]and calls the otherallocateColumns
allocateColumns creates an array of OffHeapColumnVector for every field (to hold capacity number of elements of the data type per field).
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Note
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allocateColumns is used when…FIXME
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