code: func ParseSimpleExprCastWithTableInfo(ctx sessionctx.Context, exprStr string, tableInfo *model.TableInfo, targetFt *types.FieldType) (Expression, error) {
  	e, err := ParseSimpleExprWithTableInfo(ctx, exprStr, tableInfo)
  	if err != nil {
  		return nil, err
  	}
  	e = BuildCastFunction(ctx, e, targetFt)
  	return e, nil
  }
docs: // ParseSimpleExprCastWithTableInfo parses simple expression string to Expression.
  // And the expr returns will cast to the target type.