some related tags queries are broken

E.g., "getRelatedTagsForGroup" returns many (20+) tags for http://www.bibsonomy.org/group/kde/analysis%20people%20sys:relevantFor:kde although only one post is returned having the tags "analysis important information_spreading people tumor twitter".

My assumption is, that the SQL iteration

(<iterate property="tagIndex" conjunction=" OR ">t.tag_lower = LOWER(#tagIndex[].tagName#)</iterate>)

is not working. For post queries we never use OR but self-JOINs. There are also other queries that use this construct.

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