docs: public void ensureNamespace(String schema)
      {
          try {
              // If the table schema is not "default" and the namespace does not exist, create it
              if (!schema.equals(DEFAULT) && !connector.namespaceOperations().exists(schema)) {
                  connector.namespaceOperations().create(schema);
              }
          }
          catch (AccumuloException | AccumuloSecurityException e) {
              throw new PrestoException(UNEXPECTED_ACCUMULO_ERROR, "Failed to check for existence or create Accumulo namespace", e);
          }
          catch (NamespaceExistsException e) {
              // Suppress race condition between test for existence and creation
              LOG.warn("NamespaceExistsException suppressed when creating " + schema);
          }
      }