Fix of the test suite.

mysql-test/r/statistics.result

@@ -1423,6 +1423,7 @@ ANALYZE TABLE CountryLanguage;
 set histogram_size=254;
 set histogram_type='DOUBLE_PREC_HB';
 ANALYZE TABLE City;
+FLUSH TABLES;
 select db_name,table_name,column_name,min_value,max_value,nulls_ratio,avg_length,avg_frequency,hist_size,hist_type,hex(histogram),decode_histogram(histogram,hist_type) from mysql.column_stats where table_name='CountryLanguage' and column_name = 'Percentage';;
 db_name	world
 table_name	CountryLanguage

mysql-test/t/statistics.test

@@ -572,6 +572,7 @@ ANALYZE TABLE CountryLanguage;
 set histogram_size=254;
 set histogram_type='DOUBLE_PREC_HB';
 ANALYZE TABLE City;
+FLUSH TABLES;
 --enable_result_log
 
 --query_vertical select db_name,table_name,column_name,min_value,max_value,nulls_ratio,avg_length,avg_frequency,hist_size,hist_type,hex(histogram),decode_histogram(histogram,hist_type) from mysql.column_stats where table_name='CountryLanguage' and column_name = 'Percentage';