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From "Thomas Tauber-Marshall (Code Review)" <>
Subject [Impala-CR](cdh5-trunk) IMPALA-3210: last/first value() support for IGNORE NULLS
Date Wed, 13 Jul 2016 19:01:26 GMT
Thomas Tauber-Marshall has uploaded a new patch set (#11).

Change subject: IMPALA-3210: last/first_value() support for IGNORE NULLS

IMPALA-3210: last/first_value() support for IGNORE NULLS

Added support for the 'ignore nulls' keyword to the last_value and
first_value analytic functions, eg. 'last_value(col ignore nulls)',
which would return the last value from the window that is not null,
or null if all of the values in the window are null.

We handle 'ignore nulls' in the FE in the same way that we handle
'distinct' - by adding isIgnoreNulls as a field in FunctionParams.

To avoid affecting performance when 'ignore nulls' is not used, and
to avoid having to special case 'ignore nulls' on the backend, this
patch adds 'last_value_ignore_nulls' and 'first_value_ignore_nulls'
builtin analytic functions that wrap 'last_value' and 'first_value'

Change-Id: Ic27525e2237fb54318549d2674f1610884208e9b
M be/src/exprs/
M be/src/exprs/aggregate-functions.h
M fe/src/main/cup/sql-parser.cup
M fe/src/main/java/com/cloudera/impala/analysis/
M fe/src/main/java/com/cloudera/impala/analysis/
M fe/src/main/java/com/cloudera/impala/analysis/
M fe/src/main/java/com/cloudera/impala/catalog/
M fe/src/test/java/com/cloudera/impala/analysis/
M testdata/workloads/functional-planner/queries/PlannerTest/analytic-fns.test
M testdata/workloads/functional-query/queries/QueryTest/analytic-fns.test
M testdata/workloads/functional-query/queries/QueryTest/decimal.test
11 files changed, 913 insertions(+), 137 deletions(-)

  git pull ssh:// refs/changes/28/3328/11
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Gerrit-MessageType: newpatchset
Gerrit-Change-Id: Ic27525e2237fb54318549d2674f1610884208e9b
Gerrit-PatchSet: 11
Gerrit-Project: Impala
Gerrit-Branch: cdh5-trunk
Gerrit-Owner: Thomas Tauber-Marshall <>
Gerrit-Reviewer: Marcel Kornacker <>
Gerrit-Reviewer: Matthew Jacobs <>
Gerrit-Reviewer: Thomas Tauber-Marshall <>

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