Allow citus size functions on replicated tables

src/backend/distributed/metadata/metadata_utility.c

@@ -367,14 +367,6 @@ ErrorIfNotSuitableToGetSize(Oid relationId)
 						errmsg("cannot calculate the size because relation %s is not "
 							   "distributed", escapedQueryString)));
 	}
-
-	if (IsCitusTableType(relationId, HASH_DISTRIBUTED) &&
-		!SingleReplicatedTable(relationId))
-	{
-		ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
-						errmsg("cannot calculate the size because replication factor "
-							   "is greater than 1")));
-	}
 }
 
 

src/test/regress/expected/multi_size_queries.out

@@ -22,12 +22,25 @@ SELECT citus_total_relation_size('non_distributed_table');
 ERROR:  cannot calculate the size because relation 'non_distributed_table' is not distributed
 DROP TABLE non_distributed_table;
 -- Tests on distributed table with replication factor > 1
+VACUUM (FULL) lineitem_hash_part;
 SELECT citus_table_size('lineitem_hash_part');
-ERROR:  cannot calculate the size because replication factor is greater than 1
+ citus_table_size
+---------------------------------------------------------------------
+          3801088
+(1 row)
+
 SELECT citus_relation_size('lineitem_hash_part');
-ERROR:  cannot calculate the size because replication factor is greater than 1
+ citus_relation_size
+---------------------------------------------------------------------
+             3801088
+(1 row)
+
 SELECT citus_total_relation_size('lineitem_hash_part');
-ERROR:  cannot calculate the size because replication factor is greater than 1
+ citus_total_relation_size
+---------------------------------------------------------------------
+                   3801088
+(1 row)
+
 VACUUM (FULL) customer_copy_hash;
 -- Tests on distributed tables with streaming replication.
 SELECT citus_table_size('customer_copy_hash');

src/test/regress/sql/multi_size_queries.sql

@@ -20,6 +20,8 @@ SELECT citus_total_relation_size('non_distributed_table');
 DROP TABLE non_distributed_table;
 
 -- Tests on distributed table with replication factor > 1
+VACUUM (FULL) lineitem_hash_part;
+
 SELECT citus_table_size('lineitem_hash_part');
 SELECT citus_relation_size('lineitem_hash_part');
 SELECT citus_total_relation_size('lineitem_hash_part');