ancientelves commented on issue #4341: shardingsphere  4.0.0 retrive very slow 
that sql script
URL: 
https://github.com/apache/incubator-shardingsphere/issues/4341#issuecomment-587237800
 
 
   @kimmking 
   yes,one sql.
   for sharding:SELECT SUM(size) as size_sum FROM table_test_0 
......table_test_16
   for single table:SELECT SUM(size) as size_sum FROM table_test
   sharding performance is bad than single table 
   total size:1,0000,000

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