我有一个名为school的集合，其中的文档如下：
{
"_id" : 0,
"_class" : "com.aixueniao.server.model.School",
"companyUserId" : 0,
"schoolUserId" : 0,
"schoolName" : "校区名称",
"showSchoolName" : 0,
"gradeIds" : "[]",
"firstLevelSubjectIds" : "[]",
"secondLevelSubjectIds" : "[]",
"classType" : "",
"introduction" : "校区介绍",
"mainImageId" : 0,
"imageIds" : "[]",
"longitude" : 0.0,
"latitude" : 0.0,
"locationId" : 0,
"address" : "校区地址",
"runningTime" : 0.0,
"teacherCount" : 0,
"telephone" : "",
"fixedPhone" : "",
"createTime" : "2017-01-13 01:16:54",
"expirationTime" : "2017-01-13 01:16:54",
"schoolStatus" : "ARREARS",
"authorizationStatus" : "NO",
"rejectReason" : "无"
}
文档中大约有26个字段，字段数是否会影响查询性能？我将查询4个字段，并将使用$ near查询。提前谢谢。