ydb/yql/essentials/udfs/common/set/test/cases/ListDistinctStructInDict.sql

/* syntax version 1 */
select AGGREGATE_LIST_DISTINCT(x) from 
(select [{<|a:1,b:2|>},{<|a:1,b:3|>},{<|a:1,b:2|>}] as x)
flatten list by x;