It try retrieving all Comments from a single person inside a discussion board. This is the CAML:
<View> <QueryOptions><ViewAttributes Scope='RecursiveAll' /></QueryOptions> <Query> <Where> <Eq> <FieldRef Name='Author' LookupId='TRUE'/> <Value Type='Lookup'>10</Value> </Eq> </Where> </Query> <ViewFields></ViewFields> </View>
When looking at that List manually I can see that there are discussions with comments from the author with id "10"
But when I run this query all I retrieve is an empty result.