The current read-loop fails to detect end-of-page and if the query
result buider cuts the page, it will just proceed to the next
partition. This will result in distorted query results, as the result
builder will request for the consumption to stop after each clustering
row.
To fix, check if the page was cut before moving on to the next
partition.
A unit test reproducing the bug was also added.
b55cead5cd