Hi,I note phoenix can runs queries in parallel automatically.But I don't 
understand    this formula:
-------------------------------t is the target concurrencym is the max 
concurrencyr is the number of regions we need to scan
if r >= t    scan using regional boundaries else if r/2 > t    split each 
region in s splits such that: s = max(x) where s * x < m else    split each 
region in s splits such that:  s = max(x) where s * x < t 
-------------------------------
if there is only one regions to scan and target concurrency态max concurrency  
are default value.how many parallelization  can be excute
Thanks                                    

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