public CassandraFormatBuilder setMaxConnectionsPerHost(Integer maxConnectionsPerHost) {
            format.maxConnectionsPerHost = maxConnectionsPerHost;
            return this;
        }
Executes prepared statement and closes all resources of this instance.

@throws IOException Thrown, if the input could not be closed properly.
cassandra/cassandra-sink/src/main/java/com/dtstack/flink/sql/sink/cassandra/CassandraOutputFormat.java