Method Copy

pkg/col/coldata/vec.eg.go:490–920

Copy uses SliceArgs to copy elements of a source Vec into this Vec. It is logically equivalent to: copy(destVec[args.DestIdx:], args.Src[args.SrcStartIdx:args.SrcEndIdx]) An optional Sel slice can also be provided to apply a filter on the source Vec. Refer to the SliceArgs comment for specifics and

(args SliceArgs)

// Vec.
// Refer to the SliceArgs comment for specifics and TestCopy for examples.
func (v *Vec) Copy(args SliceArgs) {
	if args.SrcStartIdx == args.SrcEndIdx {
		// Nothing to copy, so return early.
		return
	}
	if v.Nulls().MaybeHasNulls() {
		// We're about to overwrite this entire range, so unset all the nulls.
		v.Nulls().UnsetNullRange(args.DestIdx, args.DestIdx+(args.SrcEndIdx-args.SrcStartIdx))
	}

	switch v.CanonicalTypeFamily() {
	case types.BoolFamily:
		switch v.t.Width() {
		case -1:
		default:
			fromCol := args.Src.Bool()
			toCol := v.Bool()
			if args.Sel != nil {
				sel := args.Sel[args.SrcStartIdx:args.SrcEndIdx]
				n := len(sel)
				toCol = toCol[args.DestIdx:]
				_ = toCol[n-1]
				if args.Src.MaybeHasNulls() {
					nulls := args.Src.Nulls()
					for i := 0; i < n; i++ {
						//gcassert:bce
						selIdx := sel[i]
						if nulls.NullAt(selIdx) {
							v.nulls.SetNull(i + args.DestIdx)
						} else {
							v := fromCol.Get(selIdx)
							//gcassert:bce
							toCol.Set(i, v)
						}
					}
					return
				}
				// No Nulls.
				for i := 0; i < n; i++ {
					//gcassert:bce
					selIdx := sel[i]
					v := fromCol.Get(selIdx)
					//gcassert:bce
					toCol.Set(i, v)
				}
				return
			}
			// No Sel.
			toCol.CopySlice(fromCol, args.DestIdx, args.SrcStartIdx, args.SrcEndIdx)
			v.nulls.set(args)
		}
	case types.BytesFamily:
		switch v.t.Width() {
		case -1:
		default:
			fromCol := args.Src.Bytes()
			toCol := v.Bytes()
			if args.Sel != nil {