Add ALTER VIEW ... RENAME TO, and a RENAME TO clause to ALTER SEQUENCE.

Sequences and views could previously be renamed using ALTER TABLE, but
this was a repeated source of confusion for users. Update the docs,
and psql tab completion. Patch from David Fetter; various minor fixes
by myself.

12 files changed, 173 insertions, 15 deletions

diff --git a/doc/src/sgml/ref/allfiles.sgml b/doc/src/sgml/ref/allfiles.sgml
index 8bfa76aed8..f2c4e2f21e 100644
--- a/doc/src/sgml/ref/allfiles.sgml
+++ b/doc/src/sgml/ref/allfiles.sgml
@@ -25,6 +25,7 @@ Complete list of usable sgml source files in this directory.
 <!entity alterTrigger       system "alter_trigger.sgml">
 <!entity alterType          system "alter_type.sgml">
 <!entity alterUser          system "alter_user.sgml">
+<!entity alterView          system "alter_view.sgml">
 <!entity analyze            system "analyze.sgml">
 <!entity begin              system "begin.sgml">
 <!entity checkpoint         system "checkpoint.sgml">
diff --git a/doc/src/sgml/ref/alter_sequence.sgml b/doc/src/sgml/ref/alter_sequence.sgml
index 56a9c57d4b..394ab885b4 100644
--- a/doc/src/sgml/ref/alter_sequence.sgml
+++ b/doc/src/sgml/ref/alter_sequence.sgml
@@ -29,6 +29,7 @@ ALTER SEQUENCE <replaceable class="parameter">name</replaceable> [ INCREMENT [ B
     [ RESTART [ WITH ] <replaceable class="parameter">start</replaceable> ] [ CACHE <replaceable class="parameter">cache</replaceable> ] [ [ NO ] CYCLE ]
     [ OWNED BY { <replaceable class="parameter">table</replaceable>.<replaceable class="parameter">column</replaceable> | NONE } ]
 ALTER SEQUENCE <replaceable class="parameter">name</replaceable> SET SCHEMA <replaceable class="parameter">new_schema</replaceable>
+ALTER SEQUENCE <replaceable class="parameter">name</replaceable> RENAME TO <replaceable class="parameter">new_name</replaceable>
   </synopsis>
  </refsynopsisdiv>
 
@@ -182,14 +183,24 @@ ALTER SEQUENCE <replaceable class="parameter">name</replaceable> SET SCHEMA <rep
     </listitem>
    </varlistentry>
 
-     <varlistentry>
-      <term><replaceable class="parameter">new_schema</replaceable></term>
-      <listitem>
-       <para>
-        The new schema for the sequence.
-       </para>
-      </listitem>
-     </varlistentry>
+   <varlistentry>
+    <term><replaceable class="parameter">new_schema</replaceable></term>
+    <listitem>
+     <para>
+      The new schema for the sequence.
+     </para>
+    </listitem>
+   </varlistentry>
+
+   <varlistentry>
+    <term><replaceable class="parameter">new_name</replaceable></term>
+    <listitem>
+     <para>
+      The new name for the sequence.
+     </para>
+    </listitem>
+   </varlistentry>
+
     </variablelist>
    </para>
   </refsect1>
diff --git a/doc/src/sgml/ref/alter_view.sgml b/doc/src/sgml/ref/alter_view.sgml
new file mode 100644
index 0000000000..2057d02cd8
--- /dev/null
+++ b/doc/src/sgml/ref/alter_view.sgml
@@ -0,0 +1,88 @@
+<!--
+$PostgreSQL$
+PostgreSQL documentation
+-->
+
+<refentry id="SQL-ALTERVIEW">
+ <refmeta>
+  <refentrytitle id="SQL-ALTERVIEW-TITLE">ALTER VIEW</refentrytitle>
+  <refmiscinfo>SQL - Language Statements</refmiscinfo>
+ </refmeta>
+
+ <refnamediv>
+  <refname>ALTER VIEW</refname>
+  <refpurpose>change the definition of a view</refpurpose>
+ </refnamediv>  
+  
+ <indexterm zone="sql-alterview">
+  <primary>ALTER VIEW</primary>
+ </indexterm>
+
+ <refsynopsisdiv>
+<synopsis>
+ALTER VIEW <replaceable>name</replaceable> RENAME TO <replaceable>newname</replaceable>
+</synopsis>
+ </refsynopsisdiv>
+  
+ <refsect1>
+  <title>Description</title>
+
+  <para>
+   <command>ALTER VIEW</command> changes the definition of a
+   view. To execute this command you must be the owner of the view.
+  </para>
+ </refsect1>
+  
+ <refsect1>
+  <title>Parameters</title>
+
+  <variablelist>
+   <varlistentry>
+    <term><replaceable class="parameter">name</replaceable></term>
+    <listitem>
+     <para>
+      The name (optionally schema-qualified) of an existing view.
+     </para>
+    </listitem>
+   </varlistentry>
+
+   <varlistentry>
+    <term><replaceable class="parameter">newname</replaceable></term>
+    <listitem>
+     <para>
+      The new name of the view.
+     </para>
+    </listitem>
+   </varlistentry>
+  </variablelist>
+ </refsect1>
+
+ <refsect1>
+  <title>Examples</title>
+
+  <para>
+   To rename the view <literal>foo</literal> to
+   <literal>bar</literal>:
+<programlisting>
+ALTER VIEW foo RENAME TO bar;
+</programlisting>
+  </para>
+
+ <refsect1>
+  <title>Compatibility</title>
+
+  <para>
+   <command>ALTER VIEW</command> is a <productname>PostgreSQL</>
+   extension of the SQL standard.
+  </para>
+ </refsect1>
+
+ <refsect1>
+  <title>See Also</title>
+
+  <simplelist type="inline">
+   <member><xref linkend="sql-createview" endterm="sql-createview-title"></member>
+   <member><xref linkend="sql-dropview" endterm="sql-dropview-title"></member>
+  </simplelist>
+ </refsect1>
+</refentry>
diff --git a/doc/src/sgml/ref/create_view.sgml b/doc/src/sgml/ref/create_view.sgml
index 8bc51123b1..844857e98e 100644
--- a/doc/src/sgml/ref/create_view.sgml
+++ b/doc/src/sgml/ref/create_view.sgml
@@ -226,6 +226,7 @@ CREATE VIEW <replaceable class="parameter">name</replaceable> [ ( <replaceable c
   <title>See Also</title>
 
   <simplelist type="inline">
+   <member><xref linkend="sql-alterview" endterm="sql-alterview-title"></member>
    <member><xref linkend="sql-dropview" endterm="sql-dropview-title"></member>
   </simplelist>
  </refsect1>
diff --git a/doc/src/sgml/ref/drop_view.sgml b/doc/src/sgml/ref/drop_view.sgml
index 20a4145e4f..0adde5edf5 100644
--- a/doc/src/sgml/ref/drop_view.sgml
+++ b/doc/src/sgml/ref/drop_view.sgml
@@ -104,6 +104,7 @@ DROP VIEW kinds;
   <title>See Also</title>
 
   <simplelist type="inline">
+   <member><xref linkend="sql-alterview" endterm="sql-alterview-title"></member>
    <member><xref linkend="sql-createview" endterm="sql-createview-title"></member>
   </simplelist>
  </refsect1>
diff --git a/doc/src/sgml/reference.sgml b/doc/src/sgml/reference.sgml
index dc3f117161..9c8a55909b 100644
--- a/doc/src/sgml/reference.sgml
+++ b/doc/src/sgml/reference.sgml
@@ -53,6 +53,7 @@
    &alterTrigger;
    &alterType;
    &alterUser;
+   &alterView;
    &analyze;
    &begin;
    &checkpoint;
diff --git a/src/backend/commands/alter.c b/src/backend/commands/alter.c
index 94c241aced..8c441155bc 100644
--- a/src/backend/commands/alter.c
+++ b/src/backend/commands/alter.c
@@ -83,6 +83,8 @@ ExecRenameStmt(RenameStmt *stmt)
 			break;
 
 		case OBJECT_TABLE:
+		case OBJECT_SEQUENCE:
+		case OBJECT_VIEW:
 		case OBJECT_INDEX:
 		case OBJECT_COLUMN:
 		case OBJECT_TRIGGER:
@@ -96,6 +98,8 @@ ExecRenameStmt(RenameStmt *stmt)
 				switch (stmt->renameType)
 				{
 					case OBJECT_TABLE:
+					case OBJECT_SEQUENCE:
+					case OBJECT_VIEW:
 					case OBJECT_INDEX:
 						{
 							/*
@@ -113,7 +117,7 @@ ExecRenameStmt(RenameStmt *stmt)
 								aclcheck_error(aclresult, ACL_KIND_NAMESPACE,
 											get_namespace_name(namespaceId));
 
-							renamerel(relid, stmt->newname);
+							renamerel(relid, stmt->newname, stmt->renameType);
 							break;
 						}
 					case OBJECT_COLUMN:
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 1cd3121a40..c940d3373e 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -41,6 +41,7 @@
 #include "executor/executor.h"
 #include "miscadmin.h"
 #include "nodes/makefuncs.h"
+#include "nodes/parsenodes.h"
 #include "optimizer/clauses.h"
 #include "optimizer/plancat.h"
 #include "optimizer/prep.h"
@@ -1621,7 +1622,7 @@ renameatt(Oid myrelid,
  *			  sequence, AFAIK there's no need for it to be there.
  */
 void
-renamerel(Oid myrelid, const char *newrelname)
+renamerel(Oid myrelid, const char *newrelname, ObjectType reltype)
 {
 	Relation	targetrelation;
 	Relation	relrelation;	/* for RELATION relation */
@@ -1633,8 +1634,8 @@ renamerel(Oid myrelid, const char *newrelname)
 	bool		relhastriggers;
 
 	/*
-	 * Grab an exclusive lock on the target table or index, which we will NOT
-	 * release until end of transaction.
+	 * Grab an exclusive lock on the target table, index, sequence or
+	 * view, which we will NOT release until end of transaction.
 	 */
 	targetrelation = relation_open(myrelid, AccessExclusiveLock);
 
@@ -1647,7 +1648,24 @@ renamerel(Oid myrelid, const char *newrelname)
 				 errmsg("permission denied: \"%s\" is a system catalog",
 						RelationGetRelationName(targetrelation))));
 
+	/*
+	 * For compatibility with prior releases, we don't complain if
+	 * ALTER TABLE or ALTER INDEX is used to rename a sequence or
+	 * view.
+	 */
 	relkind = targetrelation->rd_rel->relkind;
+	if (reltype == OBJECT_SEQUENCE && relkind != 'S')
+		ereport(ERROR,
+				(errcode(ERRCODE_WRONG_OBJECT_TYPE),
+				 errmsg("\"%s\" is not a sequence",
+						RelationGetRelationName(targetrelation))));
+
+	if (reltype == OBJECT_VIEW && relkind != 'v')
+		ereport(ERROR,
+				(errcode(ERRCODE_WRONG_OBJECT_TYPE),
+				 errmsg("\"%s\" is not a view",
+						RelationGetRelationName(targetrelation))));
+
 	relhastriggers = (targetrelation->rd_rel->reltriggers > 0);
 
 	/*
diff --git a/src/backend/parser/gram.y b/src/backend/parser/gram.y
index 43cfc9b88a..96b79b62a6 100644
--- a/src/backend/parser/gram.y
+++ b/src/backend/parser/gram.y
@@ -4546,6 +4546,24 @@ RenameStmt: ALTER AGGREGATE func_name aggr_args RENAME TO name
 					n->newname = $6;
 					$$ = (Node *)n;
 				}
+			| ALTER SEQUENCE relation_expr RENAME TO name
+				{
+					RenameStmt *n = makeNode(RenameStmt);
+					n->renameType = OBJECT_SEQUENCE;
+					n->relation = $3;
+					n->subname = NULL;
+					n->newname = $6;
+					$$ = (Node *)n;
+				}
+			| ALTER VIEW relation_expr RENAME TO name
+				{
+					RenameStmt *n = makeNode(RenameStmt);
+					n->renameType = OBJECT_VIEW;
+					n->relation = $3;
+					n->subname = NULL;
+					n->newname = $6;
+					$$ = (Node *)n;
+				}
 			| ALTER INDEX relation_expr RENAME TO name
 				{
 					RenameStmt *n = makeNode(RenameStmt);
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 94a433bab4..a9963633aa 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1574,6 +1574,9 @@ CreateCommandTag(Node *parsetree)
 				case OBJECT_SCHEMA:
 					tag = "ALTER SCHEMA";
 					break;
+				case OBJECT_SEQUENCE:
+					tag = "ALTER SEQUENCE";
+					break;
 				case OBJECT_COLUMN:
 				case OBJECT_TABLE:
 					tag = "ALTER TABLE";
@@ -1584,6 +1587,9 @@ CreateCommandTag(Node *parsetree)
 				case OBJECT_TRIGGER:
 					tag = "ALTER TRIGGER";
 					break;
+				case OBJECT_VIEW:
+					tag = "ALTER VIEW";
+					break;
 				default:
 					tag = "???";
 					break;
diff --git a/src/bin/psql/tab-complete.c b/src/bin/psql/tab-complete.c
index 1e765a4838..2c96872481 100644
--- a/src/bin/psql/tab-complete.c
+++ b/src/bin/psql/tab-complete.c
@@ -602,7 +602,7 @@ psql_completion(char *text, int start, int end)
 		static const char *const list_ALTER[] =
 		{"AGGREGATE", "CONVERSION", "DATABASE", "DOMAIN", "FUNCTION",
 			"GROUP", "INDEX", "LANGUAGE", "OPERATOR", "ROLE", "SCHEMA", "SEQUENCE", "TABLE",
-		"TABLESPACE", "TRIGGER", "TYPE", "USER", NULL};
+		"TABLESPACE", "TRIGGER", "TYPE", "USER", "VIEW", NULL};
 
 		COMPLETE_WITH_LIST(list_ALTER);
 	}
@@ -714,7 +714,7 @@ psql_completion(char *text, int start, int end)
 	{
 		static const char *const list_ALTERSEQUENCE[] =
 		{"INCREMENT", "MINVALUE", "MAXVALUE", "RESTART", "NO", "CACHE", "CYCLE",
-		"SET SCHEMA", NULL};
+		"SET SCHEMA", "RENAME TO", NULL};
 
 		COMPLETE_WITH_LIST(list_ALTERSEQUENCE);
 	}
@@ -728,6 +728,14 @@ psql_completion(char *text, int start, int end)
 
 		COMPLETE_WITH_LIST(list_ALTERSEQUENCE2);
 	}
+	/* ALTER VIEW <name> */
+	else if (pg_strcasecmp(prev3_wd, "ALTER") == 0 &&
+			 pg_strcasecmp(prev2_wd, "VIEW") == 0)
+	{
+		static const char *const list_ALTERVIEW[] = {"RENAME TO", NULL};
+
+		COMPLETE_WITH_LIST(list_ALTERVIEW);
+	}
 	/* ALTER TRIGGER <name>, add ON */
 	else if (pg_strcasecmp(prev3_wd, "ALTER") == 0 &&
 			 pg_strcasecmp(prev2_wd, "TRIGGER") == 0)
diff --git a/src/include/commands/tablecmds.h b/src/include/commands/tablecmds.h
index b5e70716ca..fc25a4342d 100644
--- a/src/include/commands/tablecmds.h
+++ b/src/include/commands/tablecmds.h
@@ -43,7 +43,8 @@ extern void renameatt(Oid myrelid,
 		  bool recursing);
 
 extern void renamerel(Oid myrelid,
-		  const char *newrelname);
+		  const char *newrelname,
+		  ObjectType reltype);
 
 extern void find_composite_type_dependencies(Oid typeOid,
 											 const char *origTblName,