Add zero-shard UPDATE/DELETE test

For completeness. They work now and result in a no-op.
citusdata · Feb 27, 2015 · 9540764 · 9540764
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commit 9540764
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diff --git a/expected/queries.out b/expected/queries.out
@@ -78,13 +78,16 @@ INSERT INTO articles VALUES (47,  7, 'abeyance', 1772);
 INSERT INTO articles VALUES (48,  8, 'alkylic', 18610);
 INSERT INTO articles VALUES (49,  9, 'anyone', 2681);
 INSERT INTO articles VALUES (50, 10, 'anjanette', 19519);
--- first, test zero-shard query
+-- first, test zero-shard SELECT, which should return zero rows
 SELECT COUNT(*) FROM articles WHERE author_id = 1 AND author_id = 2;
  count 
 -------
      0
 (1 row)
 
+-- zero-shard modifications should be no-ops but not fail
+UPDATE articles SET title = '' WHERE author_id = 1 AND author_id = 2;
+DELETE FROM articles WHERE author_id = 1 AND author_id = 2;
 -- single-shard tests
 -- test simple select for a single row
 SELECT * FROM articles WHERE author_id = 10 AND id = 50;

diff --git a/sql/queries.sql b/sql/queries.sql
@@ -69,9 +69,13 @@ INSERT INTO articles VALUES (48,  8, 'alkylic', 18610);
 INSERT INTO articles VALUES (49,  9, 'anyone', 2681);
 INSERT INTO articles VALUES (50, 10, 'anjanette', 19519);
 
--- first, test zero-shard query
+-- first, test zero-shard SELECT, which should return zero rows
 SELECT COUNT(*) FROM articles WHERE author_id = 1 AND author_id = 2;
 
+-- zero-shard modifications should be no-ops but not fail
+UPDATE articles SET title = '' WHERE author_id = 1 AND author_id = 2;
+DELETE FROM articles WHERE author_id = 1 AND author_id = 2;
+
 -- single-shard tests
 
 -- test simple select for a single row