Fix q17

Author: resetius

ydb/library/benchmarks/queries/tpch/yql/q17.sql

@@ -4,30 +4,41 @@
 -- TPC TPC-H Parameter Substitution (Version 2.17.2 build 0)
 -- using 1680793381 as a seed to the RNG
 
+$p = select p_partkey from {{part}}
+where
+    p_brand = 'Brand#35'
+    and p_container = 'LG DRUM'
+;
+
 $threshold = (
 select
     0.2 * avg(l_quantity) as threshold,
     l.l_partkey as l_partkey
 from
     {{lineitem}} as l
-join
-    {{part}} as p
-on
+left semi join
+    $p as p
+on  
     p.p_partkey = l.l_partkey
-where
-    p.p_brand = 'Brand#35'
-    and p.p_container = 'LG DRUM'
 group by
     l.l_partkey
 );
 
+$l = select l.l_partkey as l_partkey, l.l_quantity as l_quantity, l.l_extendedprice as l_extendedprice
+from
+    {{lineitem}} as l
+join
+    $p as p
+on  
+    p.p_partkey = l.l_partkey;
+
 select
     sum(l.l_extendedprice) / 7.0 as avg_yearly
 from
-    {{lineitem}} as l
+    $l as l
 join
     $threshold as t
-on
+on  
     t.l_partkey = l.l_partkey
 where
     l.l_quantity < t.threshold;