Between create new filter with Between operation (Custom).

BetweenEq create new filter with Between Equal operation (Custom).

Contains create new filter with Contains operation.

Exists match the documents that contain the field.

EndWith create new filter with EndWith operation.

Exists match the documents that contain the field.

Gt create new filter with Gt operation.

Gte create new filter with Gte operation.

In create new filter with In operation.

Lt create new filter with Lt operation.

Lte create new filter with Lte operation.

Ne create new filter with Ne operation.

Nin create new filter with Nin operation.

Not create new filter with Not operation.

PipeGroup = create pipe for group aggregation.

PipeLimit = create pipe for limit aggregation.

PipeLookup = create pipe for lookup to another collection.

PipeMatch = create pipe for match filter.

PipeProject = create pipe for project aggregation.

PipeSkip = create pipe for skip aggregation.

PipeSort = create pipe for single sort aggregation.

PipeSortMultiple = create pipe for multiple sort aggregation.

PipeSwitch = create pipe for switch condition.

PipeUnwind = create pipe for unwind arrays.

Range create new filter with Range operation.

RangeEq create new filter with Range Equal operation.

StartWith create new filter with StartWith operation.

OpAnd is AND.

OpBetween is Between (Custom).

OpBetweenEq is Between Equal.

OpContains is Contains.

ElemMatch is Elem Match operator.

OpEndWith is End with.

OpEq is Equal.

OpExists is Exists.

OpGt is Greater than.

OpGte is Greater than or Equal.

OpIn is In.

OpLt is Less than.

OpLte is Less than or equal.

OpNe is Not Equal.

OpNin is Not in.

OpNot is Not.

OpOr is OR.

OpRange is range from until.

OpRangeEq is Range Equal.

OpSort is Sort.

OpStartWith is Start with.

Command = command struct.

PipeSortParams = params model for pipe sort multiple.

PipeSwitchCaseParams = case model for pipe switch cases.

PipeSwitchParams = params model for pipe switch.

Set = Set struct.