public String getDeleteWorkflowDefStatement() {
        return QueryBuilder.delete()
                .from(keyspace, TABLE_WORKFLOW_DEFS)
                .where(eq(WORKFLOW_DEF_NAME_KEY, bindMarker()))
                .and(eq(WORKFLOW_VERSION_KEY, bindMarker()))
                .getQueryString();
    }
@return cql query statement to delete a workflow definition by name and version from the
    "workflow_definitions" table
cassandra-persistence/src/main/java/com/netflix/conductor/cassandra/util/Statements.java