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Conditional Aggregation Operators
Name |
Description |
$cond |
A ternary operator that evaluates one expression, and depending on
the result, returns the value of one of the other two expressions.
Accepts either three expressions in an ordered list or three named
parameters. |
$ifNull |
Returns either the non-null result of the first expression or the
result of the second expression if the first expression results in a
null result. Null result encompasses instances of undefined values or
missing fields. Accepts two expressions as arguments. The result of
the second expression can be null. |