Add TEMPORARY sequences and have SERIAL on a temp table have a temporary

sequence.

doc/src/sgml/ref/create_sequence.sgml

 <!--
-$Header: /cvsroot/pgsql/doc/src/sgml/ref/create_sequence.sgml,v 1.15 2000/12/08 20:06:58 tgl Exp $
+$Header: /cvsroot/pgsql/doc/src/sgml/ref/create_sequence.sgml,v 1.16 2001/06/23 00:07:33 momjian Exp $
 Postgres documentation
 -->
 
@@ -23,7 +23,7 @@ Postgres documentation
    <date>1999-07-20</date>
   </refsynopsisdivinfo>
   <synopsis>
-CREATE SEQUENCE <replaceable class="parameter">seqname</replaceable> [ INCREMENT <replaceable class="parameter">increment</replaceable> ]
+CREATE [ TEMPORARY | TEMP ] SEQUENCE <replaceable class="parameter">seqname</replaceable> [ INCREMENT <replaceable class="parameter">increment</replaceable> ]
     [ MINVALUE <replaceable class="parameter">minvalue</replaceable> ] [ MAXVALUE <replaceable class="parameter">maxvalue</replaceable> ]
     [ START <replaceable class="parameter">start</replaceable> ] [ CACHE <replaceable class="parameter">cache</replaceable> ] [ CYCLE ]
   </synopsis>
@@ -37,6 +37,19 @@ CREATE SEQUENCE <replaceable class="parameter">seqname</replaceable> [ INCREMENT
    </title>
    <para>
 
+    <variablelist>
+     <varlistentry>
+      <term>TEMPORARY or TEMP</term>
+      <listitem>
+       <para>
+	If specified, the sequence is created only for this session, and is
+	automatically dropped on session exit.
+	Existing permanent sequences with the same name are not visible
+	(in this session) while the temporary sequence exists.
+       </para>
+      </listitem>
+     </varlistentry>
+
     <variablelist>
      <varlistentry>
       <term><replaceable class="parameter">seqname</replaceable></term>

src/backend/commands/sequence.c

@@ -8,7 +8,7 @@
  *
  *
  * IDENTIFICATION
- *	  $Header: /cvsroot/pgsql/src/backend/commands/sequence.c,v 1.59 2001/06/13 21:07:12 momjian Exp $
+ *	  $Header: /cvsroot/pgsql/src/backend/commands/sequence.c,v 1.60 2001/06/23 00:07:34 momjian Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -161,6 +161,7 @@ DefineSequence(CreateSeqStmt *seq)
 	}
 
 	stmt->relname = seq->seqname;
+	stmt->istemp = seq->istemp;
 	stmt->inhRelnames = NIL;
 	stmt->constraints = NIL;
 

src/backend/parser/analyze.c

@@ -6,7 +6,7 @@
  * Portions Copyright (c) 1996-2001, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
- *	$Header: /cvsroot/pgsql/src/backend/parser/analyze.c,v 1.189 2001/06/04 23:27:23 momjian Exp $
+ *	$Header: /cvsroot/pgsql/src/backend/parser/analyze.c,v 1.190 2001/06/23 00:07:34 momjian Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -779,6 +779,7 @@ transformCreateStmt(ParseState *pstate, CreateStmt *stmt)
 
 					sequence = makeNode(CreateSeqStmt);
 					sequence->seqname = pstrdup(sname);
+					sequence->istemp = stmt->istemp;
 					sequence->options = NIL;
 
 					elog(NOTICE, "CREATE TABLE will create implicit sequence '%s' for SERIAL column '%s.%s'",
@@ -2716,7 +2717,7 @@ transformAlterTableStmt(ParseState *pstate, AlterTableStmt *stmt)
 	return qry;
 }
 
-/* 
+/*
  * Transform uses of %TYPE in a statement.
  */
 static Node *

src/backend/parser/gram.y

@@ -11,7 +11,7 @@
  *
  *
  * IDENTIFICATION
- *	  $Header: /cvsroot/pgsql/src/backend/parser/gram.y,v 2.231 2001/06/19 22:39:11 tgl Exp $
+ *	  $Header: /cvsroot/pgsql/src/backend/parser/gram.y,v 2.232 2001/06/23 00:07:34 momjian Exp $
  *
  * HISTORY
  *	  AUTHOR			DATE			MAJOR EVENT
@@ -1574,11 +1574,12 @@ CreateAsElement:  ColId
  *
  *****************************************************************************/
 
-CreateSeqStmt:  CREATE SEQUENCE relation_name OptSeqList
+CreateSeqStmt:  CREATE OptTemp SEQUENCE relation_name OptSeqList
 				{
 					CreateSeqStmt *n = makeNode(CreateSeqStmt);
-					n->seqname = $3;
-					n->options = $4;
+					n->istemp = $2;
+					n->seqname = $4;
+					n->options = $5;
 					$$ = (Node *)n;
 				}
 		;

src/include/nodes/parsenodes.h

@@ -7,7 +7,7 @@
  * Portions Copyright (c) 1996-2001, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
- * $Id: parsenodes.h,v 1.132 2001/06/19 22:39:12 tgl Exp $
+ * $Id: parsenodes.h,v 1.133 2001/06/23 00:07:34 momjian Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -402,6 +402,7 @@ typedef struct CreateSeqStmt
 {
 	NodeTag		type;
 	char	   *seqname;		/* the relation to create */
+  	bool		istemp;			/* is this a temp sequence? */
 	List	   *options;
 } CreateSeqStmt;
 

src/interfaces/ecpg/preproc/preproc.y

@@ -1289,9 +1289,9 @@ CreateAsElement:  ColId { $$ = $1; }
  *
  *****************************************************************************/
 
-CreateSeqStmt:  CREATE SEQUENCE relation_name OptSeqList
+CreateSeqStmt:  CREATE OptTemp SEQUENCE relation_name OptSeqList
 				{
-					$$ = cat_str(3, make_str("create sequence"), $3, $4);
+					$$ = cat_str(4, make_str("create sequence"), $2, $4, $5);
 				}
 		;