code: func ParseSimpleExprWithTableInfo(ctx sessionctx.Context, exprStr string, tableInfo *model.TableInfo) (Expression, error) {
  	exprStr = "select " + exprStr
  	stmts, warns, err := parser.New().Parse(exprStr, "", "")
  	for _, warn := range warns {
  		ctx.GetSessionVars().StmtCtx.AppendWarning(util.SyntaxWarn(warn))
  	}
  	if err != nil {
  		return nil, util.SyntaxError(err)
  	}
  	expr := stmts[0].(*ast.SelectStmt).Fields.Fields[0].Expr
  	return RewriteSimpleExprWithTableInfo(ctx, tableInfo, expr)
  }
docs: // ParseSimpleExprWithTableInfo parses simple expression string to Expression.
  // The expression string must only reference the column in table Info.