Method Window

pkg/col/coldata/vec_tmpl.go:348–367

Window returns a "window" into the Vec. A "window" is similar to Golang's slice of the current Vec from [start, end), but the returned object is NOT allowed to be modified (the modification might result in an undefined behavior).

(start int, end int)

// allowed to be modified (the modification might result in an undefined
// behavior).
func (v *Vec) Window(start int, end int) *Vec {
	switch v.CanonicalTypeFamily() {
	// {{range .}}
	case _CANONICAL_TYPE_FAMILY:
		switch v.t.Width() {
		// {{range .WidthOverloads}}
		case _TYPE_WIDTH:
			col := v.TemplateType()
			return &Vec{
				t:                   v.t,
				canonicalTypeFamily: v.canonicalTypeFamily,
				col:                 col.Window(start, end),
				nulls:               v.nulls.Slice(start, end),
			}
			// {{end}}
		}
		// {{end}}
	}
	panic(fmt.Sprintf("unhandled type %s", v.t))
}

// SetValueAt is an inefficient helper to set the value in a Vec when the type
// is unknown.