kangkaisen opened a new pull request #256: Improve cardinality, avgRowSize, 
numNodes stat info in OlapScanNode
URL: https://github.com/apache/incubator-doris/pull/256
 
 
   Currently, the cardinality, avgRowSize, numNodes stat info in OlapScanNode 
is none, So the broadcastCost and partitionCost are both wrong and Doris 
couldn't auto choose a best join strategy.
   
   So we should make the statistical information in OlapScanNode more precise.

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