Impala Public Jenkins has submitted this change and it was merged. ( 
http://gerrit.cloudera.org:8080/10720 )

Change subject: IMPALA-6305: Allow column definitions in ALTER VIEW
......................................................................

IMPALA-6305: Allow column definitions in ALTER VIEW

This change adds support to change column definitions in ALTER VIEW
statements. This support only required minor changes in the parser
and the AlterViewStmt constructor.

Here's an example syntax:
    alter view foo (a, b comment 'helloworld') as
    select * from bar;

    describe foo;
    +------+--------+------------+
    | name | type   | comment    |
    +------+--------+------------+
    | a    | string |            |
    | b    | string | helloworld |
    +------+--------+------------+

The following tests were modified:
1. ParserTest - To check that the parser handles column definitions
   for alter view statements.
2. AnalyzerDDLTest - To ensure that the analyzer supports the
   change column definitions parsed.
3. TestDdlStatements - To verify the end-to-end functioning of
   ALTER VIEW statements with change column definitions.
4. AuthorizationTest - To ensure that alter table commands with
   column definitions check permissions as expected.

Change-Id: I6073444a814a24d97e80df15fcd39be2812f63fc
Reviewed-on: http://gerrit.cloudera.org:8080/10720
Reviewed-by: Impala Public Jenkins <impala-public-jenk...@cloudera.com>
Tested-by: Impala Public Jenkins <impala-public-jenk...@cloudera.com>
---
M fe/src/main/cup/sql-parser.cup
M fe/src/main/java/org/apache/impala/analysis/AlterViewStmt.java
M fe/src/main/java/org/apache/impala/analysis/CreateOrAlterViewStmtBase.java
M fe/src/main/java/org/apache/impala/analysis/CreateViewStmt.java
M fe/src/test/java/org/apache/impala/analysis/AnalyzeDDLTest.java
M fe/src/test/java/org/apache/impala/analysis/AuthorizationTest.java
M fe/src/test/java/org/apache/impala/analysis/ParserTest.java
M testdata/workloads/functional-query/queries/QueryTest/views-ddl.test
8 files changed, 148 insertions(+), 11 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: I6073444a814a24d97e80df15fcd39be2812f63fc
Gerrit-Change-Number: 10720
Gerrit-PatchSet: 9
Gerrit-Owner: Pooja Nilangekar <pooja.nilange...@cloudera.com>
Gerrit-Reviewer: Fredy Wijaya <fwij...@cloudera.com>
Gerrit-Reviewer: Impala Public Jenkins <impala-public-jenk...@cloudera.com>
Gerrit-Reviewer: Pooja Nilangekar <pooja.nilange...@cloudera.com>
Gerrit-Reviewer: Tim Armstrong <tarmstr...@cloudera.com>
Gerrit-Reviewer: Vuk Ercegovac <vercego...@cloudera.com>

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