[Impala-ASF-CR] IMPALA-5317: add DATE TRUNC() function

["sandeep akinapelli (Code Review)" <ge...@cloudera.org>]

sandeep akinapelli has uploaded a new patch set (#2).

Change subject: IMPALA-5317: add DATE_TRUNC() function
......................................................................

IMPALA-5317: add DATE_TRUNC() function

Added a UDF builtin function date_trunc.
Reuse many of the Trunc functions implemented already for trunc() including
truncate unit and except strToTruncUnit
Added checks to ensure that truncation results that fall outside of
posix timestamp range are returned as NULL.
Added ctest for the date_trunc function.

Change-Id: I953ba006cbb166dcc78e8c0c12dfbf70f093b584
---
M be/src/exprs/expr-test.cc
M be/src/exprs/udf-builtins-ir.cc
M be/src/exprs/udf-builtins.cc
M be/src/exprs/udf-builtins.h
M common/function-registry/impala_functions.py
5 files changed, 378 insertions(+), 47 deletions(-)


  git pull ssh://gerrit.cloudera.org:29418/Impala-ASF refs/changes/13/7313/2
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Gerrit-MessageType: newpatchset
Gerrit-Change-Id: I953ba006cbb166dcc78e8c0c12dfbf70f093b584
Gerrit-PatchSet: 2
Gerrit-Project: Impala-ASF
Gerrit-Branch: master
Gerrit-Owner: sandeep akinapelli <sa...@cloudera.com>
Gerrit-Reviewer: Tim Armstrong <ta...@cloudera.com>