fix: Disable column-statistics during mysqldump command. This option

was recently enabled by default in mysqldump, but the generation of
histogram statistics fails in devstack during this script's mysqldump
commands. The SQL statement and output of the failure:

mysql> SELECT \
COLUMN_NAME, JSON_EXTRACT(HISTOGRAM, '$."number-of-buckets-specified"') \
FROM information_schema.COLUMN_STATISTICS \
WHERE \
SCHEMA_NAME = 'edxtest' AND \
TABLE_NAME = 'agreements_integritysignature';
ERROR 1109 (42S02): Unknown table 'COLUMN_STATISTICS' in information_schema

scripts/reset-test-db.sh

@@ -89,11 +89,11 @@ rebuild_cache_for_db() {
     echo "Using the dumpdata command to save the $db fixture data to the filesystem."
     ./manage.py lms --settings $SETTINGS dumpdata --database $db > $DB_CACHE_DIR/bok_choy_data_$db.json --exclude=api_admin.Catalog
     echo "Saving the schema of the $db bok_choy DB to the filesystem."
-    mysqldump $MYSQL_HOST -u root --no-data --skip-comments --skip-dump-date "${databases[$db]}" > $DB_CACHE_DIR/bok_choy_schema_$db.sql
+    mysqldump --column_statistics=0 $MYSQL_HOST -u root --no-data --skip-comments --skip-dump-date "${databases[$db]}" > $DB_CACHE_DIR/bok_choy_schema_$db.sql
 
     # dump_data does not dump the django_migrations table so we do it separately.
     echo "Saving the django_migrations table of the $db bok_choy DB to the filesystem."
-    mysqldump $MYSQL_HOST -u root --no-create-info --skip-comments --skip-dump-date "${databases["$db"]}" django_migrations > $DB_CACHE_DIR/bok_choy_migrations_data_$db.sql
+    mysqldump --column_statistics=0 $MYSQL_HOST -u root --no-create-info --skip-comments --skip-dump-date "${databases["$db"]}" django_migrations > $DB_CACHE_DIR/bok_choy_migrations_data_$db.sql
 }
 
 for db in "${database_order[@]}"; do