BUG #11457: The below query crashes 9.3.5, but not 9.3.4

The following bug has been logged on the website:

Bug reference: 11457
Logged by: Nelson Page
Email address: npage(at)dynamicsignal(dot)com
PostgreSQL version: 9.3.5
Operating system: WIndows 8.1
Description:

SELECT

"GroupBy1"."A1" AS "C1"

FROM ( SELECT Count(1) AS "A1"

FROM (SELECT

"UnionAll4"."C1"

FROM (SELECT

"UnionAll3"."C1"

FROM (SELECT

"UnionAll2"."C1"

FROM (SELECT

"UnionAll1"."activityId" AS "C1"

FROM (SELECT

"Extent1"."activityId"

FROM "ActivityBlogCampaign" AS "Extent1"

UNION ALL

SELECT

"Extent2"."activityId"

FROM "ActivitySubmitArticle" AS "Extent2") AS "UnionAll1"

UNION ALL

SELECT

"Extent3"."activityId"

FROM "ActivityCuratedPost" AS "Extent3") AS "UnionAll2"

UNION ALL

SELECT

"Extent4"."activityId"

FROM "ActivitySurvey" AS "Extent4") AS "UnionAll3"

UNION ALL

SELECT

"Extent5"."activityId"

FROM "ActivityHashTag" AS "Extent5") AS "UnionAll4"

UNION ALL

SELECT

"Extent6"."activityId"

FROM "ActivityShareArticle" AS "Extent6") AS "UnionAll5"

INNER JOIN "Activity" AS "Extent7" ON "UnionAll5"."C1" =
"Extent7"."activityId"
GROUP BY "Extent7"."activityId"

) As "GroupBy1"