tree a45d740be15e73675f0fa94068cf85a838885d2c
parent 4d2c7cd57295662cd6482ecd0f77a35eb60e8f8f
author Taewoo Kim <wangsaeu@yahoo.com> 1493700097 -0700
committer Taewoo Kim <wangsaeu@gmail.com> 1493745998 -0700

ASTERIXDB-1892: Sets a proper hash table cardinality during hash-group by

 - Set a proper hash table cardinality during the merge phase
   of the external hash group-by operator.
 - Currently, the number of tuples in a spilled partition is
   used as the hash table cardinality. And this can cause an issue
   since compiler.groupmemory size is not considered.
 - So, like the initial group-by build phase, the hash table
   cardinality will be set properly based on the memory budget for
   the group-by operator.

Change-Id: I651139b2b559ad4d2f6137a5c844814606516a90
Reviewed-on: https://asterix-gerrit.ics.uci.edu/1702
Sonar-Qube: Jenkins <jenkins@fulliautomatix.ics.uci.edu>
Tested-by: Jenkins <jenkins@fulliautomatix.ics.uci.edu>
BAD: Jenkins <jenkins@fulliautomatix.ics.uci.edu>
Integration-Tests: Jenkins <jenkins@fulliautomatix.ics.uci.edu>
Reviewed-by: Yingyi Bu <buyingyi@gmail.com>