D. all of the mentioned
Map-reduce uses custom __________ functions to perform the map and reduce operations.
Which of the following operation can be optionally used for map reduce ?
The aggregation pipeline can use ___________ to improve its performance during some of its stages.
______ returns true if the first value is less than the second.
$ne returns true if the values are not _______
$multiply __________ numbers to return the result.
_______ adds numbers to return the sum, or adds numbers and a date to return a new date.
_______ returns the remainder of the first number divided by the second.
String expressions, with the exception of ________ only have a well-defined behavior for strings of ASCII characters.