Rewrite IC 6 with cypher (#84)

nebula/queries/interactive-complex-6.ngql

@@ -1,7 +1,10 @@
-GO 1 to 2 steps from $personId over KNOWS bidirect where KNOWS._dst <> $personId yield distinct KNOWS._dst as friend |
-GO from $-.friend over POST_HAS_CREATOR reversely yield distinct POST_HAS_CREATOR._dst as friendPost |
-GO from $-.friendPost over HAS_TAG where $$.`Tag`.name==$tagName yield distinct HAS_TAG._src as postWithSpecifiedTag |
-GO from $-.postWithSpecifiedTag over HAS_TAG where $$.`Tag`.name<>$tagName yield distinct $$.`Tag`.name as otherTagName, HAS_TAG._src as commonPost |
-group by $-.otherTagName yield $-.otherTagName as otherTagName, count($-.commonPost) as postCount |
-order by $-.postCount desc, $-.otherTagName ASC |
-limit 10
+MATCH (person:Person)-[:KNOWS*1..2]-(friend:Person)
+WHERE id(person) == $personId AND id(friend) != $personId
+WITH DISTINCT friend
+MATCH (knownTag:`Tag`{name: $tagName})<-[:HAS_TAG]-(post:Post),
+      (post)-[:POST_HAS_CREATOR]->(friend:Person),
+      (post)-[:HAS_TAG]->(t:`Tag`)
+WHERE t.`Tag`.name != $tagName
+RETURN t.`Tag`.name AS tagName, count(id(post)) AS postCount
+ORDER BY postCount DESC, tagName ASC
+LIMIT 10