public String getSelectAllWorkflowDefsLatestVersionsStatement() {
        return QueryBuilder.select()
                .all()
                .from(keyspace, TABLE_WORKFLOW_DEFS_INDEX)
                .where(eq(WORKFLOW_DEF_INDEX_KEY, bindMarker()))
                .getQueryString();
    }
@return cql query statement to fetch all workflow def names and version from the
    "workflow_defs_index" table
cassandra-persistence/src/main/java/com/netflix/conductor/cassandra/util/Statements.java