Backport to branch(3) : Reduce the number of concurrent DDLs from 10 to 1 for Cosmos DB in the integration tests

core/src/integration-test/java/com/scalar/db/storage/cosmos/CosmosCrossPartitionScanIntegrationTest.java

@@ -27,6 +27,16 @@ protected Map<String, String> getCreationOptions() {
     return CosmosEnv.getCreationOptions();
   }
 
+  @Override
+  protected int getThreadNum() {
+    return 3;
+  }
+
+  @Override
+  protected boolean isParallelDdlSupported() {
+    return false;
+  }
+
   @Test
   @Override
   @Disabled("Cross partition scan with ordering is not supported in Cosmos DB")

core/src/integration-test/java/com/scalar/db/storage/cosmos/CosmosMultipleClusteringKeyScanIntegrationTest.java

@@ -46,6 +46,11 @@ protected int getThreadNum() {
     return 3;
   }
 
+  @Override
+  protected boolean isParallelDdlSupported() {
+    return false;
+  }
+
   @Override
   protected Map<String, String> getCreationOptions() {
     return CosmosEnv.getCreationOptions();

core/src/integration-test/java/com/scalar/db/storage/cosmos/CosmosMultiplePartitionKeyIntegrationTest.java

@@ -24,6 +24,11 @@ protected int getThreadNum() {
     return 3;
   }
 
+  @Override
+  protected boolean isParallelDdlSupported() {
+    return false;
+  }
+
   @Override
   protected Map<String, String> getCreationOptions() {
     return CosmosEnv.getCreationOptions();