public String getUpdateWorkflowDefStatement() {
        return QueryBuilder.update(keyspace, TABLE_WORKFLOW_DEFS)
                .with(set(WORKFLOW_DEFINITION_KEY, bindMarker()))
                .where(eq(WORKFLOW_DEF_NAME_KEY, bindMarker()))
                .and(eq(WORKFLOW_VERSION_KEY, bindMarker()))
                .getQueryString();
    }
@return cql query statement to update a workflow definitinos in the "workflow_definitions"
    table
cassandra-persistence/src/main/java/com/netflix/conductor/cassandra/util/Statements.java