Fix nulls in q38 (#4547)

Author: resetius

ydb/library/benchmarks/queries/tpcds/yql/q38.sql

@@ -26,10 +26,37 @@ $bla3 = (select distinct c_last_name, c_first_name, d_date
       and d_month_seq between 1186 and 1186 + 11);
 
 -- start query 1 in stream 0 using template query38.tpl and seed 1819994127
-select  count(*) from ( select * from
-    $bla1 bla1 join $bla2 bla2 on bla1.c_last_name = bla2.c_last_name and bla1.c_first_name = bla2.c_first_name and bla1.d_date = bla2.d_date
-    join $bla3 bla3 on bla1.c_last_name = bla3.c_last_name and bla1.c_first_name = bla3.c_first_name and bla1.d_date = bla3.d_date
-) hot_cust
+
+select count(*) from
+((select * from ( select bla1.c_last_name as c_last_name, bla1.c_first_name as c_first_name, bla1.d_date as d_date from
+    $bla1 bla1 join $bla2 bla2
+    on bla1.c_first_name = bla2.c_first_name and
+       bla1.d_date = bla2.d_date
+    join any $bla3 bla3
+    on bla1.c_first_name = bla3.c_first_name and
+       bla1.d_date = bla3.d_date
+    where bla1.c_last_name is null and bla2.c_last_name is null and bla3.c_last_name is null
+) hot_cust)
+union
+(select * from ( select bla1.c_last_name as c_last_name, bla1.c_first_name as c_first_name, bla1.d_date as d_date from
+    $bla1 bla1 join $bla2 bla2
+    on bla1.d_date = bla2.d_date
+    join any $bla3 bla3
+    on bla1.d_date = bla3.d_date
+    where bla1.c_last_name is null and bla2.c_last_name is null and bla3.c_last_name is null
+    and  bla1.c_first_name is null and bla2.c_first_name is null and bla3.c_first_name is null
+) hot_cust)
+union
+(select * from ( select bla1.c_last_name as c_last_name, bla1.c_first_name as c_first_name, bla1.d_date as d_date from
+    $bla1 bla1 join any $bla2 bla2
+    on bla1.c_last_name = bla2.c_last_name and
+       bla1.c_first_name = bla2.c_first_name and
+       bla1.d_date = bla2.d_date
+    join any $bla3 bla3
+    on bla1.c_last_name = bla3.c_last_name and
+       bla1.c_first_name = bla3.c_first_name and
+       bla1.d_date = bla3.d_date
+) hot_cust))
 limit 100;
 
 -- end query 1 in stream 0 using template query38.tpl