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Filter

Aliases: $match, $find

Filters the records to pass only the records that match the specified condition(s) to the next pipeline stage.

Stage as JSON​

Single filter:

{
    $filter: "blastid==160" // return only records where blastid equals 160
}

Multiple filters in stage:

{
    // returns records where:
    // (blastid equals 160) AND (segment equals 1 OR 2) AND (us_state equals "AK")
    $filter: [
        "blastid==160",
        "segment in (1,2)",
        "us_state=\"AK\""
    ]
}