ydb/yt/yql/tests/sql/suites/aggregate/input_dsv.txt

{"key"="075";"subkey"="1";"value"="a=B@@b=a@@c=a"};
{"key"="800";"subkey"="2";"value"="b=1@@c=2@@d=3"};
{"key"="020";"subkey"="3";"value"="a=i@@c=j"};
{"key"="150";"subkey"="4";"value"="a=A"};