This is a legacy parameter, for backward compatibility. New applications should use ConditionExpression instead. Do not combine legacy parameters and expression parameters in a single API call; otherwise, DynamoDB will return a ValidationException exception.
A logical operator to apply to the conditions in the Expected map: AND - If all of the conditions evaluate to true, then the entire map
evaluates to true.
OR - If at least one of the conditions evaluate to true, then the entire
map evaluates to true.
If you omit ConditionalOperator, then AND is the default.
The operation will succeed only if the entire map evaluates to true.
This parameter does not support attributes of type List or Map.