You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: parser.go
    path of file: ./repos/rill/runtime/drivers/mysql
    
    the code of the file until where you have to start completion: package mysql

import (
	"database/sql"
	"fmt"
	"reflect"
	"strings"

	runtimev1 "github.com/rilldata/rill/proto/gen/
    
func (m numericMapper) dest(st reflect.Type) (any, error) {
	switch st {
	case scanTypeInt8:
		return new(int8), nil
	case scanTypeInt16:
		return new(int16), nil
	case scanTypeInt32:
		return new(int32), nil
	case scanTypeInt64:
		return new(int64), nil
	case scanTypeUint8:
		return new(uint8), nil
	case scanTypeUint16:
		return new(uint16), nil
	case scanTypeUint32:
		return new(uint32), nil
	case scanTypeUint64:
		return new(uint64), nil
	case scanTypeNullInt:
		return new(sql.NullInt64), nil
	case scanTypeFloat32:
		return new(float32), nil
	case scanTypeFloat64:
		return new(float64), nil
	case scanTypeNullFloat:
		return new(sql.NullFloat64), nil
	default:
		return nil, fmt.Errorf("numericMapper: unsupported scan type %v", st.Name())
	}
}