Tianyi Wang has uploaded a new patch set (#4).

Change subject: IMPALA-992: Rerun past queries from history in shell
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IMPALA-992: Rerun past queries from history in shell

This patch adds a new command "rerun" and shortcut "@" to impala-shell.
User can rerun a certain query by its index given by history command.
A valid index is an integer in [1, history_length] or
[-history_length, -1]. Negavie values index history in reverse order.
For example, "@1;" or "rerun 1;" reruns the first query shown in history
and "@-1;" reruns the last query. The rerun command itself won't appear
in history. The history index is 1-based and increasing. Old entries
might be truncated when impala-shell starts, and the indexes will be
realigned to 1, so the same index may refer to different commands among
multiple impala-shell instances.

Testing: A test case test_rerun is added to
shell/test_shell_interactive.py

Change-Id: Ifc28e8ce07845343267224c3b9ccb71b29a524d2
---
M shell/impala_shell.py
M tests/shell/test_shell_interactive.py
2 files changed, 85 insertions(+), 9 deletions(-)


  git pull ssh://gerrit.cloudera.org:29418/Impala-ASF refs/changes/74/7674/4
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Gerrit-MessageType: newpatchset
Gerrit-Change-Id: Ifc28e8ce07845343267224c3b9ccb71b29a524d2
Gerrit-PatchSet: 4
Gerrit-Project: Impala-ASF
Gerrit-Branch: master
Gerrit-Owner: Tianyi Wang <[email protected]>
Gerrit-Reviewer: Lars Volker <[email protected]>
Gerrit-Reviewer: Michael Brown <[email protected]>
Gerrit-Reviewer: Sailesh Mukil <[email protected]>

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