github.com/parquet-go/parquet-go@v0.21.1-0.20240501160520-b3c3a0c3ed6f/sparse/gather.go (about)

     1  package sparse
     2  
     3  import "unsafe"
     4  
     5  func GatherInt32(dst []int32, src Int32Array) int {
     6  	return GatherUint32(*(*[]uint32)(unsafe.Pointer(&dst)), src.Uint32Array())
     7  }
     8  
     9  func GatherInt64(dst []int64, src Int64Array) int {
    10  	return GatherUint64(*(*[]uint64)(unsafe.Pointer(&dst)), src.Uint64Array())
    11  }
    12  
    13  func GatherFloat32(dst []float32, src Float32Array) int {
    14  	return GatherUint32(*(*[]uint32)(unsafe.Pointer(&dst)), src.Uint32Array())
    15  }
    16  
    17  func GatherFloat64(dst []float64, src Float64Array) int {
    18  	return GatherUint64(*(*[]uint64)(unsafe.Pointer(&dst)), src.Uint64Array())
    19  }
    20  
    21  func GatherBits(dst []byte, src Uint8Array) int { return gatherBits(dst, src) }
    22  
    23  func GatherUint32(dst []uint32, src Uint32Array) int { return gather32(dst, src) }
    24  
    25  func GatherUint64(dst []uint64, src Uint64Array) int { return gather64(dst, src) }
    26  
    27  func GatherUint128(dst [][16]byte, src Uint128Array) int { return gather128(dst, src) }
    28  
    29  func GatherString(dst []string, src StringArray) int {
    30  	n := min(len(dst), src.Len())
    31  
    32  	for i := range dst[:n] {
    33  		dst[i] = src.Index(i)
    34  	}
    35  
    36  	return n
    37  }
    38  
    39  func min(a, b int) int {
    40  	if a < b {
    41  		return a
    42  	}
    43  	return b
    44  }