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<!DOCTYPE concept PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd">
<concept rev="1.1" id="alter_view">
<title>ALTER VIEW Statement</title>
<titlealts audience="PDF">
<navtitle>ALTER VIEW</navtitle>
<data name="Category" value="Impala"/>
<data name="Category" value="SQL"/>
<data name="Category" value="DDL"/>
<data name="Category" value="Tables"/>
<data name="Category" value="Schemas"/>
<data name="Category" value="Views"/>
<data name="Category" value="Developers"/>
<data name="Category" value="Data Analysts"/>
The <codeph>ALTER VIEW</codeph> statement changes the characteristics of a view.
Because a view is a logical construct, an alias for a query, with no physical data behind
it, <codeph>ALTER VIEW</codeph> only involves changes to metadata in the metastore
database, not any data files in HDFS.
To see the definition of the updated view, issue a <codeph>DESCRIBE FORMATTED</codeph>
<p conref="../shared/impala_common.xml#common/syntax_blurb"/>
<codeblock>ALTER VIEW [<varname>database_name</varname>.]<varname>view_name</varname>
[(<varname>column_name</varname> [COMMENT '<varname>column_comment</varname>'][, ...])]
AS <varname>select_statement</varname>;
ALTER VIEW [<varname>database_name</varname>.]<varname>view_name</varname>
RENAME TO [<varname>database_name</varname>.]<varname>view_name</varname>;
ALTER VIEW [<varname>database_name</varname>.]<varname>view_name</varname> SET OWNER USER user_name;
ALTER VIEW [<varname>database_name</varname>.]<varname>view_name</varname> SET OWNER ROLE role_name;
The <codeph>AS</codeph> clause associates the view with a different query.
An optional list of column names can be specified with or without the column-level
For example:
ALTER VIEW v1 (c1, c2) AS SELECT x, UPPER(s) s FROM t2;
ALTER VIEW v7 (c1 COMMENT 'Comment for c1', c2) AS SELECT t1.c1, t1.c2 FROM t1;
The <codeph>RENAME TO</codeph> clause changes the name of the view, moves the view to a
different database, or both.
For example:
<codeblock>ALTER VIEW db1.v1 RENAME TO db2.v2; -- Move the view to a different database with a new name.
ALTER VIEW db1.v1 RENAME TO db1.v2; -- Rename the view in the same database.
ALTER VIEW db1.v1 RENAME TO db2.v1; -- Move the view to a difference database with the same view name.</codeblock>
<li rev="3.1 IMPALA-6988">
The <codeph>SET OWNER</codeph> clause transfers the ownership of the view from the
current owner to another user or a role.
The view owner is originally set to the user who creates the view. When object
ownership is enabled in Sentry, an owner of a view can have the <codeph>ALL</codeph>
with <codeph>GRANT</codeph> or <codeph>ALL</codeph> without <codeph>GRANT</codeph>
privilege. The term <codeph>OWNER</codeph> is used to differentiate between the
<codeph>ALL</codeph> privilege that is explicitly granted via the
<codeph>GRANT</codeph> statement and a privilege that is implicitly granted by the
<codeph>CREATE VIEW</codeph> statement.
<p conref="../shared/impala_common.xml#common/ddl_blurb"/>
<p conref="../shared/impala_common.xml#common/sync_ddl_blurb"/>
<p conref="../shared/impala_common.xml#common/security_blurb"/>
<p conref="../shared/impala_common.xml#common/redaction_yes"/>
<p conref="../shared/impala_common.xml#common/cancel_blurb_no"/>
<p conref="../shared/impala_common.xml#common/permissions_blurb_no"/>
<p conref="../shared/impala_common.xml#common/related_info"/>
<xref href="impala_views.xml#views"/>, <xref href="impala_create_view.xml#create_view"/>,
<xref href="impala_drop_view.xml#drop_view"/>