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From "Thomas Tauber-Marshall (Code Review)" <ger...@cloudera.org>
Subject [Impala-ASF-CR] IMPALA-4622: Add ALTER COLUMN statement.
Date Wed, 24 May 2017 14:54:04 GMT
Thomas Tauber-Marshall has uploaded a new patch set (#3).

Change subject: IMPALA-4622: Add ALTER COLUMN statement.
......................................................................

IMPALA-4622: Add ALTER COLUMN statement.

Kudu recently added the ability to alter a column's default value
and storage attributes (KUDU-861). This patch adds the ability to
modify these from Impala using ALTER.

It also supports altering a column's comment for non-Kudu tables.

It does not support setting a column to be a primary key or
chaning a column's nullability, because those are not supported on
the Kudu side yet.

Syntax:
ALTER TABLE <table> ALTER [COLUMN] <column>
  SET <attr> <value> [<attr> <value> [<attr> <value>...]]
where <attr> is one of:
  - DEFAULT, BLOCK_SIZE, ENCODING, COMPRESSION (Kudu tables)
  - COMMENT (non-Kudu tables)
ALTER TABLE <table> ALTER [COLUMN] <column> DROP DEFAULT

This is similar to the existing CHANGE statement:
ALTER TABLE <table> CHANGE <column> <new_col_name> <type>
  [COMMENT <comment>]
but the new syntax is more natural for setting column properties
when the column name and type are not being changed. ALTER COLUMN
operations are sent to the catalog as CHANGE operations where
the type and column name are unchanged.

Testing:
- Added FE tests to ParserTest and AnalyzeDDLTest
- Added EE tests to kudu_alter.test and kudu_describe.test

Change-Id: Id2e8bd65342b79644a0fdcd925e6f17797e89ad6
---
M fe/src/main/cup/sql-parser.cup
A fe/src/main/java/org/apache/impala/analysis/AlterColumnStmt.java
M fe/src/main/java/org/apache/impala/analysis/ColumnDef.java
M fe/src/main/java/org/apache/impala/service/CatalogOpExecutor.java
M fe/src/main/java/org/apache/impala/service/KuduCatalogOpExecutor.java
M fe/src/test/java/org/apache/impala/analysis/AnalyzeDDLTest.java
M fe/src/test/java/org/apache/impala/analysis/ParserTest.java
M testdata/workloads/functional-query/queries/QueryTest/alter-table.test
M testdata/workloads/functional-query/queries/QueryTest/kudu_alter.test
M testdata/workloads/functional-query/queries/QueryTest/kudu_describe.test
10 files changed, 256 insertions(+), 11 deletions(-)


  git pull ssh://gerrit.cloudera.org:29418/Impala-ASF refs/changes/55/6955/3
-- 
To view, visit http://gerrit.cloudera.org:8080/6955
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Gerrit-MessageType: newpatchset
Gerrit-Change-Id: Id2e8bd65342b79644a0fdcd925e6f17797e89ad6
Gerrit-PatchSet: 3
Gerrit-Project: Impala-ASF
Gerrit-Branch: master
Gerrit-Owner: Thomas Tauber-Marshall <tmarshall@cloudera.com>
Gerrit-Reviewer: Matthew Jacobs <mj@cloudera.com>
Gerrit-Reviewer: Thomas Tauber-Marshall <tmarshall@cloudera.com>

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