CreateQuery hierarchy_flat_dictionary (children 3)
 Identifier hierarchy_flat_dictionary
 ExpressionList (children 2)
  DictionaryAttributeDeclaration id (children 1)
   DataType UInt64
  DictionaryAttributeDeclaration parent_id (children 1)
   DataType UInt64
 Dictionary definition (children 4)
  ExpressionList (children 1)
   Identifier id
  FunctionWithKeyValueArguments  clickhouse (children 1)
   ExpressionList (children 1)
    pair (children 1)
     Literal \'hierarchy_source_table\'
  Dictionary lifetime
  Dictionary layout (children 1)
   ExpressionList