Add back test for INSERT where all placements fail

Since we now short-circuit on certain remote errors, we want to ensure
we preserve the old behavior of not modifying any placement states if
a non-short-circuiting error occurs on all placements.

src/test/regress/expected/multi_modifications.out

@@ -274,8 +274,8 @@ CONTEXT:  while executing command on localhost:57638
 -- Test that shards which miss a modification are marked unhealthy
 -- First: Connect to the second worker node
 \c - - - :worker_2_port
--- Second: Drop limit_orders shard on the second worker node
+-- Second: Move aside limit_orders shard on the second worker node
-DROP TABLE limit_orders_750000;
+ALTER TABLE limit_orders_750000 RENAME TO renamed_orders;
 -- Third: Connect back to master node
 \c - - - :master_port
 -- Fourth: Perform an INSERT on the remaining node
@@ -302,6 +302,39 @@ AND    s.logicalrelid = 'limit_orders'::regclass;
      1
 (1 row)
 
+-- Test that if all shards miss a modification, no state change occurs
+-- First: Connect to the first worker node
+\c - - - :worker_1_port
+-- Second: Move aside limit_orders shard on the second worker node
+ALTER TABLE limit_orders_750000 RENAME TO renamed_orders;
+-- Third: Connect back to master node
+\c - - - :master_port
+-- Fourth: Perform an INSERT on the remaining node
+INSERT INTO limit_orders VALUES (276, 'ADR', 140, '2007-07-02 16:32:15', 'sell', 43.67);
+WARNING:  relation "limit_orders_750000" does not exist
+CONTEXT:  while executing command on localhost:57637
+ERROR:  could not modify any active placements
+-- Last: Verify worker is still healthy
+SELECT count(*)
+FROM   pg_dist_shard_placement AS sp,
+	   pg_dist_shard           AS s
+WHERE  sp.shardid = s.shardid
+AND    sp.nodename = 'localhost'
+AND    sp.nodeport = :worker_1_port
+AND    sp.shardstate = 1
+AND    s.logicalrelid = 'limit_orders'::regclass;
+ count 
+-------
+     2
+(1 row)
+
+-- Undo our change...
+-- First: Connect to the first worker node
+\c - - - :worker_1_port
+-- Second: Move aside limit_orders shard on the second worker node
+ALTER TABLE renamed_orders RENAME TO limit_orders_750000;
+-- Third: Connect back to master node
+\c - - - :master_port
 -- commands with no constraints on the partition key are not supported
 UPDATE limit_orders SET limit_price = 0.00;
 ERROR:  distributed modifications must target exactly one shard

src/test/regress/sql/multi_modifications.sql

@@ -199,8 +199,8 @@ INSERT INTO limit_orders VALUES (275, 'ADR', 140, '2007-07-02 16:32:15', 'sell',
 -- First: Connect to the second worker node
 \c - - - :worker_2_port
 
--- Second: Drop limit_orders shard on the second worker node
+-- Second: Move aside limit_orders shard on the second worker node
-DROP TABLE limit_orders_750000;
+ALTER TABLE limit_orders_750000 RENAME TO renamed_orders;
 
 -- Third: Connect back to master node
 \c - - - :master_port
@@ -210,6 +210,7 @@ INSERT INTO limit_orders VALUES (276, 'ADR', 140, '2007-07-02 16:32:15', 'sell',
 
 -- Last: Verify the insert worked but the deleted placement is now unhealthy
 SELECT count(*) FROM limit_orders WHERE id = 276;
+
 SELECT count(*)
 FROM   pg_dist_shard_placement AS sp,
 	   pg_dist_shard           AS s
@@ -219,6 +220,41 @@ AND    sp.nodeport = :worker_2_port
 AND    sp.shardstate = 3
 AND    s.logicalrelid = 'limit_orders'::regclass;
 
+-- Test that if all shards miss a modification, no state change occurs
+
+-- First: Connect to the first worker node
+\c - - - :worker_1_port
+
+-- Second: Move aside limit_orders shard on the second worker node
+ALTER TABLE limit_orders_750000 RENAME TO renamed_orders;
+
+-- Third: Connect back to master node
+\c - - - :master_port
+
+-- Fourth: Perform an INSERT on the remaining node
+INSERT INTO limit_orders VALUES (276, 'ADR', 140, '2007-07-02 16:32:15', 'sell', 43.67);
+
+-- Last: Verify worker is still healthy
+SELECT count(*)
+FROM   pg_dist_shard_placement AS sp,
+	   pg_dist_shard           AS s
+WHERE  sp.shardid = s.shardid
+AND    sp.nodename = 'localhost'
+AND    sp.nodeport = :worker_1_port
+AND    sp.shardstate = 1
+AND    s.logicalrelid = 'limit_orders'::regclass;
+
+-- Undo our change...
+
+-- First: Connect to the first worker node
+\c - - - :worker_1_port
+
+-- Second: Move aside limit_orders shard on the second worker node
+ALTER TABLE renamed_orders RENAME TO limit_orders_750000;
+
+-- Third: Connect back to master node
+\c - - - :master_port
+
 -- commands with no constraints on the partition key are not supported
 UPDATE limit_orders SET limit_price = 0.00;