Method CopyWithReorderedSource

pkg/col/coldata/vec.eg.go:926–1288

CopyWithReorderedSource copies a value at position order[sel[i]] in src into the receiver at position sel[i]. len(sel) elements are copied. Resulting values of elements not mentioned in sel are undefined after this function.

(src *Vec, sel, order []int)

// Resulting values of elements not mentioned in sel are undefined after
// this function.
func (v *Vec) CopyWithReorderedSource(src *Vec, sel, order []int) {
	if len(sel) == 0 {
		return
	}
	if v.nulls.MaybeHasNulls() {
		v.nulls.UnsetNulls()
	}
	switch v.CanonicalTypeFamily() {
	case types.BoolFamily:
		switch v.t.Width() {
		case -1:
		default:
			fromCol := src.Bool()
			toCol := v.Bool()
			n := len(sel)
			_ = sel[n-1]
			if src.MaybeHasNulls() {
				nulls := src.Nulls()
				for i := 0; i < n; i++ {
					//gcassert:bce
					destIdx := sel[i]
					srcIdx := order[destIdx]
					if nulls.NullAt(srcIdx) {
						v.nulls.SetNull(destIdx)
					} else {
						v := fromCol.Get(srcIdx)
						toCol.Set(destIdx, v)
					}
				}
			} else {
				for i := 0; i < n; i++ {
					//gcassert:bce
					destIdx := sel[i]
					srcIdx := order[destIdx]
					{
						v := fromCol.Get(srcIdx)
						toCol.Set(destIdx, v)
					}
				}
			}
		}
	case types.BytesFamily:
		switch v.t.Width() {
		case -1:
		default:
			fromCol := src.Bytes()
			toCol := v.Bytes()
			n := len(sel)
			_ = sel[n-1]
			if src.MaybeHasNulls() {
				nulls := src.Nulls()
				for i := 0; i < n; i++ {
					//gcassert:bce
					destIdx := sel[i]
					srcIdx := order[destIdx]
					if nulls.NullAt(srcIdx) {
						v.nulls.SetNull(destIdx)
					} else {