Dan Burkert has submitted this change and it was merged.

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 <[email protected]>
Tested-by: Kudu Jenkins
---
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(-)

Approvals:
  Todd Lipcon: Looks good to me, approved
  Kudu Jenkins: Verified



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Gerrit-MessageType: merged
Gerrit-Change-Id: Ifcf29b1f274df2ef5c5ac7a7a17cc06dfd59e191
Gerrit-PatchSet: 5
Gerrit-Project: kudu
Gerrit-Branch: master
Gerrit-Owner: Dan Burkert <[email protected]>
Gerrit-Reviewer: Adar Dembo <[email protected]>
Gerrit-Reviewer: Dan Burkert <[email protected]>
Gerrit-Reviewer: Jean-Daniel Cryans
Gerrit-Reviewer: Kudu Jenkins
Gerrit-Reviewer: Todd Lipcon <[email protected]>

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