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05-23-2017
12:11 PM
I am running a map only query like "select name from personel where name='aaa'" on a orc+zlib table on the cluster and if I check the EXPLAIN results I can see execution mode is "Vectorized". If I run a simple map only union all query like "select name from personel where name='aaa' union all select name from personel where name='bbb'" then vectorization is not active for this query in the EXPLAIN results and query duration gets longer. What might be the reason this result and what is the relation between union all and vectorization?
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