Github user zentol commented on a diff in the pull request:

    https://github.com/apache/flink/pull/5964#discussion_r188545761
  
    --- Diff: 
flink-connectors/flink-connector-cassandra/src/main/java/org/apache/flink/streaming/connectors/cassandra/CassandraSink.java
 ---
    @@ -381,6 +393,9 @@ protected void sanityCheck() {
                        if (query == null || query.length() == 0) {
                                throw new IllegalArgumentException("Query must 
not be null or empty.");
                        }
    +                   if (keyspace != null && keyspace.length() != 0) {
    +                           throw new IllegalArgumentException("Specifying 
a keyspace is only allowed when using a Pojo-Stream as input.");
    --- End diff --
    
    "default keyspace"


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