A clause that translates to the $exists operator. It's value is a boolean expression:
$exists
true
attribute_exists()
false
attribute_not_exists()
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A clause that translates to the
$exists
operator. It's value is a boolean expression:true
, it performs anattribute_exists()
function on the associated propertyfalse
, it performs anattribute_not_exists()
function on the associated property