Determines if the query is idempotent, i.e. whether it can be applied multiple times without changing the result beyond the initial application.

Idempotence of the prepared statement plays a role in ISpeculativeExecutionPolicy. If a query is not idempotent, the driver will not schedule speculative executions for it.

When the property is null, the driver will use the default value from the GetDefaultIdempotence.

public Nullable<bool> IsIdempotent { get; }