feat: allow create global table through sql

CHANGELOG.md

@@ -57,6 +57,8 @@ with the `YY.0M.MICRO` scheme.
 - _Clusterwide SQL_ introduces the capability to drop picodata users.
 
 - _Clusterwide SQL_ introduces the capability to create roles.
+- _Clusterwide SQL_ now allows creation of a global table through 
+  `create table`.
 
 ### Lua API:
 

src/sql.rs

@@ -257,12 +257,17 @@ fn reenterable_ddl_request(
                     is_nullable: f.is_nullable,
                 })
                 .collect();
+            let distribution = if sharding_key.is_some() {
+                DistributionParam::Sharded
+            } else {
+                DistributionParam::Global
+            };
             let params = CreateSpaceParams {
                 id: None,
                 name,
                 format,
                 primary_key,
-                distribution: DistributionParam::Sharded,
+                distribution,
                 by_field: None,
                 sharding_key,
                 sharding_fn: Some(ShardingFn::Murmur3),

test/int/test_sql.py

@@ -238,6 +238,29 @@ def test_create_drop_table(cluster: Cluster):
     )
     assert ddl["row_count"] == 1
 
+    # Check global space
+    ddl = i1.sql(
+        """
+        create table "global_t" ("key" string not null, "value" string not null,
+        primary key ("key"))
+        using memtx
+        distributed globally
+        option (timeout = 3)
+    """
+    )
+    assert ddl["row_count"] == 1
+
+    with pytest.raises(ReturnError, match="global spaces can use only memtx engine"):
+        i1.sql(
+            """
+            create table "t" ("key" string not null, "value" string not null,
+            primary key ("key"))
+            using vinyl
+            distributed globally
+            option (timeout = 3)
+            """
+        )
+
 
 def test_insert_on_conflict(cluster: Cluster):
     cluster.deploy(instance_count=1)