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Update
To fix the error Below ActiveRecord::StatementInvalid (PG::UndefinedFunction: ERROR: operator does not exist: bigint[] & bigint[]) LINE 4: (# (array_agg(DISTINCT t1.user_id) & array_agg... ^ HINT: No operator matches the given name and argument types. You might need to add explicit type casts.
@geoffreylitt I'm getting this error too on the latest Rails. Any reason not to merge?