RQG:Error evaluating ORDER BY. - cause: Aggregate count(*) not found.

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This is a regression from 4.7.0-1533

Test which fails:

./testrunner -i local.ini -p gsi_type=forestdb -t rqg.test_rqg.RQGTests.test_rqg_concurrent,test_file_path=b/resources/rqg/simple_table_db/query_tests_using_templates/query_50000_aggregate_functions.txt.zip,database=multiple_table_db,reset_database=True,concurreny_count=10,index_quota_percent=30,password=password,use_mysql=True,replicas=0,create_secondary_indexes=True,run_query_with_primary=True,record_failure=True,failure_record_path=/tmp,nodes_init=1,build_index_batch_size=1000,build_secondary_index_in_seq=True,nodes_init=1,number_of_buckets=1,total_queries=1000,skip_cleanup=True

Job which fails:
cen006-n1ql-vset02-01-rqg-aggregate-methods-simple-table-primary-secondary-tests

Number of secondary indexes created:131
Primary index is created.

Query run:

n1ql_query :: SELECT COUNT FROM multiple_table_db_5322_simple_table_1 WHERE (bool_field1 OR char_field1 > "N") ORDER BY COUNT

Error reported:
Scenario :: run_query_without_index_hint
Reason :: CBQError: host 172.23.105.209: ERROR:{u'status': u'errors', u'errors': [\{u'msg': u'Error evaluating ORDER BY. - cause: Aggregate count(*) not found.', u'code': 5010}, \{u'msg': u'Error evaluating ORDER BY. - cause: Aggregate count(*) not found.', u'code': 5010}, \{u'msg': u'Error evaluating ORDER BY. - cause: Aggregate count(*) not found.', u'code': 5010}, \{u'msg': u'Error evaluating ORDER BY. - cause: Aggregate count(*) not found.', u'code': 5010}], u'results': [{u'$1': {}}, {u'$1': {}}, {u'$1': {}}, {u'$1': {}}, {u'$1': {}}, {u'$1'

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