Impala Public Jenkins has submitted this change and it was merged. ( 
http://gerrit.cloudera.org:8080/13880 )

Change subject: IMPALA-7770: SPLIT_PART to support negative indexes
......................................................................

IMPALA-7770: SPLIT_PART to support negative indexes

Third parameter of SPLIT_PART (nth field) accepts now
negative values, and searches the string backwards.

Testing:
 * Added unit tests to expr-test.cc

Change-Id: I2db762989a90bd95661a59eb9c11a29eb2edfafb
Reviewed-on: http://gerrit.cloudera.org:8080/13880
Reviewed-by: Impala Public Jenkins <impala-public-jenk...@cloudera.com>
Tested-by: Impala Public Jenkins <impala-public-jenk...@cloudera.com>
---
M be/src/exprs/expr-test.cc
M be/src/exprs/string-functions-ir.cc
2 files changed, 40 insertions(+), 14 deletions(-)

Approvals:
  Impala Public Jenkins: Looks good to me, approved; Verified

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Gerrit-Project: Impala-ASF
Gerrit-Branch: master
Gerrit-MessageType: merged
Gerrit-Change-Id: I2db762989a90bd95661a59eb9c11a29eb2edfafb
Gerrit-Change-Number: 13880
Gerrit-PatchSet: 10
Gerrit-Owner: Norbert Luksa <norbert.lu...@cloudera.com>
Gerrit-Reviewer: Impala Public Jenkins <impala-public-jenk...@cloudera.com>
Gerrit-Reviewer: Norbert Luksa <norbert.lu...@cloudera.com>
Gerrit-Reviewer: Zoltan Borok-Nagy <borokna...@cloudera.com>

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