Fix missing clean up in AnalyzeExprsTest.

Change-Id: Ic22981d0f2309f7cedf30d081d92542866255b97
Reviewed-on: http://gerrit.ent.cloudera.com:8080/3080
Tested-by: jenkins
Reviewed-by: Nong Li <nong@cloudera.com>
Add DCHECK to PrintExecSummary() to prevent indexing into empty array

Change-Id: Ic4d21310a5cfbb8284f58bc0244572906ae050e4
Reviewed-on: http://gerrit.ent.cloudera.com:8080/3017
Reviewed-by: Alex Behm <alex.behm@cloudera.com>
Tested-by: jenkins
IMPALA-1005: Print consistent plan fragment ids in explain plan and runtime profile.

Change-Id: I63b59a896dc9dc0c9ed1d5e889f7b5626ba61202
Reviewed-on: http://gerrit.ent.cloudera.com:8080/3037
Reviewed-by: Alex Behm <alex.behm@cloudera.com>
Tested-by: jenkins