public String getSelectTaskDefStatement() {
        return QueryBuilder.select(TASK_DEFINITION_KEY)
                .from(keyspace, TABLE_TASK_DEFS)
                .where(eq(TASK_DEFS_KEY, TASK_DEFS_KEY))
                .and(eq(TASK_DEF_NAME_KEY, bindMarker()))
                .getQueryString();
    }
@return cql query statement to fetch a task definition by name from the "task_definitions"
    table
cassandra-persistence/src/main/java/com/netflix/conductor/cassandra/util/Statements.java