presto-cassandra/src/main/java/io/prestosql/plugin/cassandra/CassandraClientConfig.java/CassandraClientConfig/setSpeculativeExecutionLimit
class CassandraClientConfig:    @Config("cassandra.speculative-execution.limit")
    public CassandraClientConfig setSpeculativeExecutionLimit(int speculativeExecutionLimit)
    {
        this.speculativeExecutionLimit = speculativeExecutionLimit;
        return this;
    }