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filter:
{
"name": "case",
"field":{
"$gt": 0
}
And Document d={}
首先使用文档operator处理
documentOp(d, filter,nil,nil)
然后是值operator处理，匹配name
valueOp(d, nil, key,value)
字段op处理(d, {$gt:0}, key="field",nil)