Re: [PR] Implemented age_tail function [age]

["rafsun42 (via GitHub)" <gi...@apache.org>]

rafsun42 commented on code in PR #1013:
URL: https://github.com/apache/age/pull/1013#discussion_r1347661465


##########
regress/expected/expr.out:
##########
@@ -6479,6 +6479,46 @@ SELECT * from cypher('list', $$RETURN range(0, null, -3)$$) as (range agtype);
 ERROR:  range(): neither start or end can be NULL
 SELECT * from cypher('list', $$RETURN range(0, -10.0, -3.0)$$) as (range agtype);
 ERROR:  range() unsupported argument type
+-- tail()
+-- should return the last elements of the list
+SELECT * FROM cypher('list', $$ RETURN tail([1,2,3,4,5]) $$) AS (tail agtype);
+     tail     
+--------------
+ [2, 3, 4, 5]
+(1 row)
+
+SELECT * FROM cypher('list', $$ RETURN tail(["a","b","c","d","e"]) $$) AS (tail agtype);
+         tail         
+----------------------
+ ["b", "c", "d", "e"]
+(1 row)
+
+-- should return null
+SELECT * FROM cypher('list', $$ RETURN tail([1]) $$) AS (tail agtype);
+ tail 
+------
+ 
+(1 row)
+
+SELECT * FROM cypher('list', $$ RETURN tail([]) $$) AS (tail agtype);
+ tail 
+------
+ 
+(1 row)
+
+-- should throw errors
+SELECT * FROM cypher('for_tail', $$ RETURN tail(123) $$) AS (tail agtype);
+ERROR:  graph "for_tail" does not exist

Review Comment:
   Is it the error we are expecting?



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