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0dc83f54be
COMPUTE STATS runs two child queries via the HS2 interface. When the client that is issuing the parent query is also using HS2, Impala would inherit the protocol version from the parent for use in the child queries, and that particularly affected the orientation that results were returned in. However, the compute stats post-processing path assumed that the results were in V1 (i.e. row-major) format. This patch adds a new key-value pair to the HS2 conf overlay to tell Impala that this is a child query. When it is set, Impala always uses the V1 protocol internally, meaning that child query results are always returned in row-major format. Since they are always consumed internally, and never sent to the user directly, this is a viable simplification. Change-Id: I9846ec2cb6a4f3b54ab0d29dd4a99916442b8e71 Reviewed-on: http://gerrit.sjc.cloudera.com:8080/5538 Reviewed-by: Henry Robinson <henry@cloudera.com> Tested-by: jenkins