Remove gratuitous discrepancy between extract() and date_part(),

regarding timezone_hour, timezone_minute vs. tz_hour, tz_minute.
Document the former.

doc/src/sgml/func.sgml

-<!-- $Header: /cvsroot/pgsql/doc/src/sgml/func.sgml,v 1.76 2001/10/09 18:46:00 petere Exp $ -->
+<!-- $Header: /cvsroot/pgsql/doc/src/sgml/func.sgml,v 1.77 2001/10/10 00:02:42 petere Exp $ -->
 
 <chapter id="functions">
  <title>Functions and Operators</title>
@@ -2800,6 +2800,34 @@ SELECT EXTRACT(SECOND FROM TIME '17:12:28.5');
        </informalexample>
       </listitem>
      </varlistentry>
+<!--
+     <varlistentry>
+      <term><literal>timezone</literal></term>
+      <listitem>
+       <para>
+        The time zone offset. XXX But in what units?
+       </para>
+      </listitem>
+     </varlistentry>
+-->
+
+     <varlistentry>
+      <term><literal>timezone_hour</literal></term>
+      <listitem>
+       <para>
+        The hour component of the time zone offset.
+       </para>
+      </listitem>
+     </varlistentry>
+
+     <varlistentry>
+      <term><literal>timezone_minute</literal></term>
+      <listitem>
+       <para>
+        The minute component of the time zone offset.
+       </para>
+      </listitem>
+     </varlistentry>
 
      <varlistentry>
       <term><literal>week</literal></term>
@@ -2838,12 +2866,6 @@ SELECT EXTRACT(YEAR FROM TIMESTAMP '2001-02-16 20:38:40');
       </listitem>
      </varlistentry>
 
-<!--
-tz
-tz_hour
-tz_minute
--->
-
     </variablelist>
 
    </para>

src/backend/parser/gram.y

@@ -11,7 +11,7 @@
  *
  *
  * IDENTIFICATION
- *	  $Header: /cvsroot/pgsql/src/backend/parser/gram.y,v 2.261 2001/10/09 22:32:32 petere Exp $
+ *	  $Header: /cvsroot/pgsql/src/backend/parser/gram.y,v 2.262 2001/10/10 00:02:42 petere Exp $
  *
  * HISTORY
  *	  AUTHOR			DATE			MAJOR EVENT
@@ -315,8 +315,8 @@ static void doNegateFloat(Value *v);
 		PARTIAL, POSITION, PRECISION, PRIMARY, PRIOR, PRIVILEGES, PROCEDURE, PUBLIC,
 		READ, REFERENCES, RELATIVE, REVOKE, RIGHT, ROLLBACK,
 		SCHEMA, SCROLL, SECOND_P, SELECT, SESSION, SESSION_USER, SET, SOME, SUBSTRING,
-		TABLE, TEMPORARY, THEN, TIME, TIMESTAMP, TIMEZONE_HOUR,
-		TIMEZONE_MINUTE, TO, TRAILING, TRANSACTION, TRIM, TRUE_P,
+		TABLE, TEMPORARY, THEN, TIME, TIMESTAMP,
+		TO, TRAILING, TRANSACTION, TRIM, TRUE_P,
 		UNENCRYPTED, UNION, UNIQUE, UNKNOWN, UPDATE, USER, USING,
 		VALUES, VARCHAR, VARYING, VIEW,
 		WHEN, WHERE, WITH, WORK, YEAR_P, ZONE
@@ -5200,8 +5200,6 @@ extract_list:  extract_arg FROM a_expr
 extract_arg:  datetime						{ $$ = $1; }
 		| SCONST							{ $$ = $1; }
 		| IDENT								{ $$ = $1; }
-		| TIMEZONE_HOUR						{ $$ = "tz_hour"; }
-		| TIMEZONE_MINUTE					{ $$ = "tz_minute"; }
 		;
 
 /* position_list uses b_expr not a_expr to avoid conflict with general IN */
@@ -5738,8 +5736,6 @@ TokenId:  ABSOLUTE						{ $$ = "absolute"; }
 		| TEMP							{ $$ = "temp"; }
 		| TEMPLATE						{ $$ = "template"; }
 		| TEMPORARY						{ $$ = "temporary"; }
-		| TIMEZONE_HOUR					{ $$ = "timezone_hour"; }
-		| TIMEZONE_MINUTE				{ $$ = "timezone_minute"; }
 		| TOAST							{ $$ = "toast"; }
 		| TRIGGER						{ $$ = "trigger"; }
 		| TRUNCATE						{ $$ = "truncate"; }

src/backend/parser/keywords.c

@@ -8,7 +8,7 @@
  *
  *
  * IDENTIFICATION
- *	  $Header: /cvsroot/pgsql/src/backend/parser/keywords.c,v 1.98 2001/10/02 21:39:35 tgl Exp $
+ *	  $Header: /cvsroot/pgsql/src/backend/parser/keywords.c,v 1.99 2001/10/10 00:02:42 petere Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -252,8 +252,6 @@ static ScanKeyword ScanKeywords[] = {
 	{"then", THEN},
 	{"time", TIME},
 	{"timestamp", TIMESTAMP},
-	{"timezone_hour", TIMEZONE_HOUR},
-	{"timezone_minute", TIMEZONE_MINUTE},
 	{"to", TO},
 	{"toast", TOAST},
 	{"trailing", TRAILING},

src/backend/utils/adt/datetime.c

@@ -8,7 +8,7 @@
  *
  *
  * IDENTIFICATION
- *	  $Header: /cvsroot/pgsql/src/backend/utils/adt/datetime.c,v 1.70 2001/10/05 06:38:59 thomas Exp $
+ *	  $Header: /cvsroot/pgsql/src/backend/utils/adt/datetime.c,v 1.71 2001/10/10 00:02:42 petere Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -293,9 +293,9 @@ static datetkn deltatktbl[] = {
 	{"seconds", UNITS, DTK_SECOND},
 	{"secs", UNITS, DTK_SECOND},
 	{DTIMEZONE, UNITS, DTK_TZ}, /* "timezone" time offset */
-	{"tz", UNITS, DTK_TZ},		/* "timezone" time offset */
-	{"tz_hour", UNITS, DTK_TZ_HOUR},	/* timezone hour units */
-	{"tz_minute", UNITS, DTK_TZ_MINUTE},		/* timezone minutes units */
+	{"timezone", UNITS, DTK_TZ},		/* "timezone" time offset */
+	{"timezone_hour", UNITS, DTK_TZ_HOUR},	/* timezone hour units */
+	{"timezone_minute", UNITS, DTK_TZ_MINUTE},		/* timezone minutes units */
 	{"undefined", RESERV, DTK_INVALID}, /* pre-v6.1 invalid time */
 	{"us", UNITS, DTK_MICROSEC},/* "microsecond" relative time units */
 	{"usec", UNITS, DTK_MICROSEC},		/* "microsecond" relative time