Function readMeasure

query/aql_postprocessor.go:226–258

(measureRow unsafe.Pointer, ast expr.Expr, measureBytes int)

}

func readMeasure(measureRow unsafe.Pointer, ast expr.Expr, measureBytes int) *float64 {
	// TODO: consider converting non-zero identity values to nil.
	var result float64
	if measureBytes == 4 {
		switch ast.Type() {
		case expr.Unsigned:
			result = float64(*(*uint32)(measureRow))
		case expr.Signed, expr.Boolean:
			result = float64(*(*int32)(measureRow))
		case expr.Float:
			result = float64(*(*float32)(measureRow))
		default:
			// Should never happen
			return nil
		}
	} else if measureBytes == 8 {
		switch ast.Type() {
		case expr.Unsigned:
			result = float64(*(*uint64)(measureRow))
		case expr.Signed, expr.Boolean:
			result = float64(*(*int64)(measureRow))
		case expr.Float:
			result = *(*float64)(measureRow)
		default:
			// Should never happen.
			return nil
		}
	} else { // should never happen
		return nil
	}

	return &result
}