[kudu-CR](branch-0.8.x) Add internal IS NOT NULL predicate type

["Dan Burkert (Code Review)" <ge...@cloudera.org>]

Dan Burkert has uploaded a new change for review.

  http://gerrit.cloudera.org:8080/2681

Change subject: Add internal IS NOT NULL predicate type
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Add internal IS NOT NULL predicate type

This commit adds an internal IS NOT NULL predicate type, and changes LESS_EQUAL
predicate simplification to result in the IS NOT NULL predicate type when the
conversion to a LESS predicate fails and the column is nullable. This fixes
scans with predicates such as 'WHERE my_nullable_int8_col <= 127`. A followup
commit will contain comprehensive predicate tests covering this case.

Change-Id: Ifcf29b1f274df2ef5c5ac7a7a17cc06dfd59e191
Reviewed-on: http://gerrit.cloudera.org:8080/2671
Reviewed-by: Todd Lipcon <to...@apache.org>
Tested-by: Kudu Jenkins
(cherry picked from commit 9b8b020210905b0cc4dd81e0ca905e098d0cad33)
---
M src/kudu/client/scan_predicate.cc
M src/kudu/client/scanner-internal.cc
M src/kudu/common/column_predicate-test.cc
M src/kudu/common/column_predicate.cc
M src/kudu/common/column_predicate.h
M src/kudu/common/common.proto
M src/kudu/tserver/tablet_service.cc
7 files changed, 120 insertions(+), 8 deletions(-)


  git pull ssh://gerrit.cloudera.org:29418/kudu refs/changes/81/2681/1
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Gerrit-MessageType: newchange
Gerrit-Change-Id: Ifcf29b1f274df2ef5c5ac7a7a17cc06dfd59e191
Gerrit-PatchSet: 1
Gerrit-Project: kudu
Gerrit-Branch: branch-0.8.x
Gerrit-Owner: Dan Burkert <da...@cloudera.com>