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[jnosql-dev] add cont() method to the MongoDBTemplate

Hi all,

Could you add the count() method to the MongoDBTemplate ?
Currently I use select(collectionName, bson).count(), but this is a huge performance hog.

Something like:

     * Returns the number of items in the collection that match the given query filter.
     * @param collectionName the collection name
     * @param filter         the query filter
     * @return the number of documents from query
     * @throws NullPointerException when filter or collectionName is null
    long count(String collectionName, Bson filter);

Thank you.


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