fix(playground): rollup designer count distinct warning

[vasilev-alex]

No description provided.

[codecov]

Codecov Report

Merging #4309 (d55ee2a) into master (c0244d1) will decrease coverage by 9.01%.
The diff coverage is 77.77%.

@@            Coverage Diff             @@
##           master    #4309      +/-   ##
==========================================
- Coverage   68.04%   59.02%   -9.02%     
==========================================
  Files         233      133     -100     
  Lines       21537    10885   -10652     
  Branches     2561     2565       +4     
==========================================
- Hits        14655     6425    -8230     
+ Misses       6607     4185    -2422     
  Partials      275      275              

Flag	Coverage Δ
cube-backend	59.02% <77.77%> (+<0.01%)	⬆️
cubesql	?

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...ejs-schema-compiler/src/adapter/PreAggregations.js	58.98% <77.77%> (+0.11%)	⬆️
...es/cubejs-schema-compiler/src/adapter/BaseQuery.js	65.59% <0.00%> (ø)
...engine/information_schema/postgres/pg_attribute.rs
...le/engine/information_schema/postgres/pg_tables.rs
...st/cubesql/cubeclient/src/models/v1_load_result.rs
...engine/information_schema/postgres/pg_namespace.rs
rust/cubesql/cubeclient/src/apis/default_api.rs
rust/cubesql/cubesql/src/lib.rs
...pile/engine/information_schema/postgres/pg_proc.rs
...st/cubesql/cubesql/src/compile/rewrite/language.rs
... and 92 more

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