Allow more timezone-like interpretation of INTERVALs.

src/test/regress/expected/interval.out

@@ -3,44 +3,44 @@
 --
 SET DATESTYLE = DEFAULT;
 -- check acceptance of "time zone style"
-SELECT INTERVAL '01:00';
+SELECT INTERVAL '01:00' AS "One hour";
- ?column? 
+ One hour 
 ----------
  +01:00
 (1 row)
 
-SELECT INTERVAL '+02:00';
+SELECT INTERVAL '+02:00' AS "Two hours";
- ?column? 
+ Two hours 
-----------
+-----------
  +02:00
 (1 row)
 
-SELECT INTERVAL '-08:00';
+SELECT INTERVAL '-08:00' AS "Eight hours";
- ?column? 
+ Eight hours 
-----------
+-------------
  -08:00
 (1 row)
 
-SELECT INTERVAL '-05';
+SELECT INTERVAL '-05' AS "Five hours";
- ?column?  
+ Five hours 
------------
+------------
- -00:00:05
+ -05:00
 (1 row)
 
-SELECT INTERVAL '-1 +02:03';
+SELECT INTERVAL '-1 +02:03' AS "22 hours ago...";
- ?column? 
+ 22 hours ago... 
-----------
+-----------------
  -21:57
 (1 row)
 
-SELECT INTERVAL '-1 days +02:03';
+SELECT INTERVAL '-1 days +02:03' AS "22 hours ago...";
- ?column? 
+ 22 hours ago... 
-----------
+-----------------
  -21:57
 (1 row)
 
-SELECT INTERVAL '10 years -11 month -12 days +13:14';
+SELECT INTERVAL '10 years -11 month -12 days +13:14' AS "9 years...";
-         ?column?         
+        9 years...        
 --------------------------
  9 years 1 mon -11 -10:46
 (1 row)