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When loading a large nested table using the GROUP_CONCAT function, Impala runs out of memory. We prevent this from happening by adding an option to partition the table and load one partition at a time. Change-Id: I8d517f94ef97e98d36eb8ebc8180865023655114 Reviewed-on: http://gerrit.cloudera.org:8080/448 Reviewed-by: Taras Bobrovytsky <tbobrovytsky@cloudera.com> Tested-by: Internal Jenkins