SQL:2008 syntax CURRENT_CATALOG, CURRENT_SCHEMA, SET CATALOG, SET SCHEMA.

doc/src/sgml/func.sgml

-<!-- $PostgreSQL: pgsql/doc/src/sgml/func.sgml,v 1.450 2008/10/14 17:12:32 tgl Exp $ -->
+<!-- $PostgreSQL: pgsql/doc/src/sgml/func.sgml,v 1.451 2008/10/27 09:37:46 petere Exp $ -->
 
  <chapter id="functions">
   <title>Functions and Operators</title>
@@ -3184,7 +3184,8 @@ cast(-44 as bit(12))           <lineannotation>111111010100</lineannotation>
     function fails and returns null.  To indicate the part of the
     pattern that should be returned on success, the pattern must contain
     two occurrences of the escape character followed by a double quote
-    (<literal>"</>).  The text matching the portion of the pattern
+    (<literal>"</>). <!-- " font-lock sanity -->
+    The text matching the portion of the pattern
     between these markers is returned.
    </para>
 
@@ -10932,6 +10933,12 @@ postgres=# select * from unnest2(array[[1,2],[3,4]]);
      </thead>
 
      <tbody>
+      <row>
+       <entry><literal><function>current_catalog</function></literal></entry>
+       <entry><type>name</type></entry>
+       <entry>name of current database (called <quote>catalog</quote> in the SQL standard)</entry>
+      </row>
+
       <row>
        <entry><literal><function>current_database</function>()</literal></entry>
        <entry><type>name</type></entry>
@@ -10939,7 +10946,7 @@ postgres=# select * from unnest2(array[[1,2],[3,4]]);
       </row>
 
       <row>
-       <entry><literal><function>current_schema</function>()</literal></entry>
+       <entry><literal><function>current_schema</function>[()]</literal></entry>
        <entry><type>name</type></entry>
        <entry>name of current schema</entry>
       </row>
@@ -11055,6 +11062,10 @@ postgres=# select * from unnest2(array[[1,2],[3,4]]);
     <secondary>current</secondary>
    </indexterm>
 
+   <indexterm>
+    <primary>current_catalog</primary>
+   </indexterm>
+
    <indexterm>
     <primary>current_database</primary>
    </indexterm>
@@ -11083,9 +11094,12 @@ postgres=# select * from unnest2(array[[1,2],[3,4]]);
 
    <note>
     <para>
-     <function>current_user</function>, <function>session_user</function>, and
-     <function>user</function> have special syntactic status in <acronym>SQL</acronym>:
-     they must be called without trailing parentheses.
+     <function>current_catalog</function>, <function>current_schema</function>,
+     <function>current_user</function>, <function>session_user</function>,
+     and <function>user</function> have special syntactic status
+     in <acronym>SQL</acronym>: they must be called without trailing
+     parentheses (optional in PostgreSQL in the case
+     of <function>current_schema</function>).
     </para>
    </note>
 

doc/src/sgml/ref/set.sgml

 <!--
-$PostgreSQL: pgsql/doc/src/sgml/ref/set.sgml,v 1.92 2008/03/10 12:39:22 tgl Exp $
+$PostgreSQL: pgsql/doc/src/sgml/ref/set.sgml,v 1.93 2008/10/27 09:37:47 petere Exp $
 PostgreSQL documentation
 -->
 
@@ -150,6 +150,17 @@ SET [ SESSION | LOCAL ] TIME ZONE { <replaceable class="PARAMETER">timezone</rep
    special syntax:
 
    <variablelist>
+    <varlistentry>
+     <term><literal>SCHEMA</literal></term>
+     <listitem>
+      <para>
+       <literal>SET SCHEMA '<replaceable>value</>'</> is an alias for
+       <literal>SET search_path TO <replaceable>value</></>.  Only one
+       schema can be specified using this syntax.
+      </para>
+     </listitem>
+    </varlistentry>
+
     <varlistentry>
      <term><literal>NAMES</literal></term>
      <listitem>

src/backend/catalog/sql_features.txt

@@ -295,8 +295,8 @@ F731	INSERT column privileges			NO
 F741	Referential MATCH types			NO	no partial match yet
 F751	View CHECK enhancements			NO	
 F761	Session management			YES	
-F762	CURRENT_CATALOG			NO	same as current_database()
-F763	CURRENT_SCHEMA			NO	same as current_schema()
+F762	CURRENT_CATALOG			YES	
+F763	CURRENT_SCHEMA			YES	
 F771	Connection management			YES	
 F781	Self-referencing operations			YES	
 F791	Insensitive cursors			YES	

src/backend/parser/gram.y

@@ -11,7 +11,7 @@
  *
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/backend/parser/gram.y,v 2.629 2008/10/27 08:47:14 petere Exp $
+ *	  $PostgreSQL: pgsql/src/backend/parser/gram.y,v 2.630 2008/10/27 09:37:47 petere Exp $
  *
  * HISTORY
  *	  AUTHOR			DATE			MAJOR EVENT
@@ -401,12 +401,13 @@ static TypeName *TableFuncTypeName(List *columns);
 	BACKWARD BEFORE BEGIN_P BETWEEN BIGINT BINARY BIT
 	BOOLEAN_P BOTH BY
 
-	CACHE CALLED CASCADE CASCADED CASE CAST CHAIN CHAR_P
+	CACHE CALLED CASCADE CASCADED CASE CAST CATALOG_P CHAIN CHAR_P
 	CHARACTER CHARACTERISTICS CHECK CHECKPOINT CLASS CLOSE
 	CLUSTER COALESCE COLLATE COLUMN COMMENT COMMIT
 	COMMITTED CONCURRENTLY CONFIGURATION CONNECTION CONSTRAINT CONSTRAINTS
 	CONTENT_P CONTINUE_P CONVERSION_P COPY COST CREATE CREATEDB
-	CREATEROLE CREATEUSER CROSS CSV CTYPE CURRENT_P CURRENT_DATE CURRENT_ROLE
+	CREATEROLE CREATEUSER CROSS CSV CTYPE CURRENT_P
+	CURRENT_CATALOG CURRENT_DATE CURRENT_ROLE CURRENT_SCHEMA
 	CURRENT_TIME CURRENT_TIMESTAMP CURRENT_USER CURSOR CYCLE
 
 	DATA_P DATABASE DAY_P DEALLOCATE DEC DECIMAL_P DECLARE DEFAULT DEFAULTS
@@ -1133,6 +1134,22 @@ set_rest:	/* Generic SET syntaxes: */
 					n->args = $5;
 					$$ = n;
 				}
+			| CATALOG_P Sconst
+				{
+					ereport(ERROR,
+							(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
+							 errmsg("current database cannot be changed"),
+							 scanner_errposition(@2)));
+					$$ = NULL; /*not reached*/
+				}
+			| SCHEMA Sconst
+				{
+					VariableSetStmt *n = makeNode(VariableSetStmt);
+					n->kind = VAR_SET_VALUE;
+					n->name = "search_path";
+					n->args = list_make1(makeStringConst($2, @2));
+					$$ = n;
+				}
 			| NAMES opt_encoding
 				{
 					VariableSetStmt *n = makeNode(VariableSetStmt);
@@ -8401,6 +8418,28 @@ func_expr:	func_name '(' ')'
 					n->location = @1;
 					$$ = (Node *)n;
 				}
+			| CURRENT_CATALOG
+				{
+					FuncCall *n = makeNode(FuncCall);
+					n->funcname = SystemFuncName("current_database");
+					n->args = NIL;
+					n->agg_star = FALSE;
+					n->agg_distinct = FALSE;
+					n->func_variadic = FALSE;
+					n->location = @1;
+					$$ = (Node *)n;
+				}
+			| CURRENT_SCHEMA
+				{
+					FuncCall *n = makeNode(FuncCall);
+					n->funcname = SystemFuncName("current_schema");
+					n->args = NIL;
+					n->agg_star = FALSE;
+					n->agg_distinct = FALSE;
+					n->func_variadic = FALSE;
+					n->location = @1;
+					$$ = (Node *)n;
+				}
 			| CAST '(' a_expr AS Typename ')'
 				{ $$ = makeTypeCast($3, $5, @1); }
 			| EXTRACT '(' extract_list ')'
@@ -9336,6 +9375,7 @@ unreserved_keyword:
 			| CALLED
 			| CASCADE
 			| CASCADED
+			| CATALOG_P
 			| CHAIN
 			| CHARACTERISTICS
 			| CHECKPOINT
@@ -9625,6 +9665,7 @@ type_func_name_keyword:
 			| BETWEEN
 			| BINARY
 			| CROSS
+			| CURRENT_SCHEMA
 			| FREEZE
 			| FULL
 			| ILIKE
@@ -9667,6 +9708,7 @@ reserved_keyword:
 			| COLUMN
 			| CONSTRAINT
 			| CREATE
+			| CURRENT_CATALOG
 			| CURRENT_DATE
 			| CURRENT_ROLE
 			| CURRENT_TIME

src/backend/parser/keywords.c

@@ -11,7 +11,7 @@
  *
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/backend/parser/keywords.c,v 1.204 2008/10/22 11:00:34 petere Exp $
+ *	  $PostgreSQL: pgsql/src/backend/parser/keywords.c,v 1.205 2008/10/27 09:37:47 petere Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -83,6 +83,7 @@ const ScanKeyword ScanKeywords[] = {
 	{"cascaded", CASCADED, UNRESERVED_KEYWORD},
 	{"case", CASE, RESERVED_KEYWORD},
 	{"cast", CAST, RESERVED_KEYWORD},
+	{"catalog", CATALOG_P, UNRESERVED_KEYWORD},
 	{"chain", CHAIN, UNRESERVED_KEYWORD},
 	{"char", CHAR_P, COL_NAME_KEYWORD},
 	{"character", CHARACTER, COL_NAME_KEYWORD},
@@ -116,8 +117,10 @@ const ScanKeyword ScanKeywords[] = {
 	{"csv", CSV, UNRESERVED_KEYWORD},
 	{"ctype", CTYPE, UNRESERVED_KEYWORD},
 	{"current", CURRENT_P, UNRESERVED_KEYWORD},
+	{"current_catalog", CURRENT_CATALOG, RESERVED_KEYWORD},
 	{"current_date", CURRENT_DATE, RESERVED_KEYWORD},
 	{"current_role", CURRENT_ROLE, RESERVED_KEYWORD},
+	{"current_schema", CURRENT_SCHEMA, TYPE_FUNC_NAME_KEYWORD},
 	{"current_time", CURRENT_TIME, RESERVED_KEYWORD},
 	{"current_timestamp", CURRENT_TIMESTAMP, RESERVED_KEYWORD},
 	{"current_user", CURRENT_USER, RESERVED_KEYWORD},

src/interfaces/ecpg/preproc/preproc.y

-/* $PostgreSQL: pgsql/src/interfaces/ecpg/preproc/preproc.y,v 1.377 2008/10/21 08:38:16 petere Exp $ */
+/* $PostgreSQL: pgsql/src/interfaces/ecpg/preproc/preproc.y,v 1.378 2008/10/27 09:37:47 petere Exp $ */
 
 /* Copyright comment */
 %{
@@ -423,12 +423,13 @@ add_typedef(char *name, char * dimension, char * length, enum ECPGttype type_enu
 	BACKWARD BEFORE BEGIN_P BETWEEN BIGINT BINARY BIT
 	BOOLEAN_P BOTH BY
 
-	CACHE CALLED CASCADE CASCADED CASE CAST CHAIN CHAR_P
+	CACHE CALLED CASCADE CASCADED CASE CAST CATALOG_P CHAIN CHAR_P
 	CHARACTER CHARACTERISTICS CHECK CHECKPOINT CLASS CLOSE
 	CLUSTER COALESCE COLLATE COLUMN COMMENT COMMIT
 	COMMITTED CONCURRENTLY CONFIGURATION CONNECTION CONSTRAINT CONSTRAINTS 
 	CONTENT_P CONTINUE_P CONVERSION_P COPY COST CREATE CREATEDB
-	CREATEROLE CREATEUSER CROSS CSV CTYPE CURRENT_P CURRENT_DATE CURRENT_ROLE
+	CREATEROLE CREATEUSER CROSS CSV CTYPE CURRENT_P
+	CURRENT_CATALOG CURRENT_DATE CURRENT_ROLE CURRENT_SCHEMA
 	CURRENT_TIME CURRENT_TIMESTAMP CURRENT_USER CURSOR CYCLE
 
 	DATA_P DATABASE DAY_P DEALLOCATE DEC DECIMAL_P DECLARE DEFAULT DEFAULTS
@@ -1217,6 +1218,10 @@ set_rest:	/* Generic SET syntaxes: */
 			{ $$ = cat2_str(make_str("transaction"), $2); }
 		| SESSION CHARACTERISTICS AS TRANSACTION transaction_mode_list
 			{ $$ = cat2_str(make_str("session characteristics as transaction"), $5); }
+		| CATALOG_P Sconst
+			{ $$ = cat2_str(make_str("catalog"), $2); }
+		| SCHEMA Sconst
+			{ $$ = cat2_str(make_str("schema"), $2); }
 		| NAMES opt_encoding
 			{ $$ = cat2_str(make_str("names"), $2); }
 		| ROLE ColId_or_Sconst
@@ -4469,6 +4474,10 @@ func_expr:      func_name '(' ')'
 			{ $$ = make_str("session_user"); }
 		| USER
 			{ $$ = make_str("user"); }
+		| CURRENT_CATALOG
+			{ $$ = make_str("current_catalog"); }
+		| CURRENT_SCHEMA
+			{ $$ = make_str("current_schema"); }
 		| CAST '(' a_expr AS Typename ')'
 			{ $$ = cat_str(5, make_str("cast("), $3, make_str("as"), $5, make_str(")")); }
 		| EXTRACT '(' extract_list ')'
@@ -6867,10 +6876,12 @@ reserved_keyword:
 		| CONSTRAINT		{ $$ = make_str("constraint"); }
 		| CREATE			{ $$ = make_str("create"); }
 		| CURRENT_P                     { $$ = make_str("current"); }
+		| CURRENT_CATALOG	{ $$ = make_str("current_catalog"); }
 		| CURRENT_DATE		{ $$ = make_str("current_date"); }
 		| CURRENT_TIME		{ $$ = make_str("current_time"); }
 		| CURRENT_TIMESTAMP	{ $$ = make_str("current_timestamp"); }
 		| CURRENT_ROLE		{ $$ = make_str("current_role"); }
+		| CURRENT_SCHEMA	{ $$ = make_str("current_schema"); }
 		| CURRENT_USER		{ $$ = make_str("current_user"); }
 		| DEFAULT			{ $$ = make_str("default"); }
 		| DEFERRABLE		{ $$ = make_str("deferrable"); }