CreateQuery 01778_db hierarchy_source_table (children 4)
 Identifier 01778_db
 Identifier hierarchy_source_table
 Columns definition (children 1)
  ExpressionList (children 2)
   ColumnDeclaration id (children 1)
    DataType UInt64
   ColumnDeclaration parent_id (children 1)
    DataType UInt64
 Storage definition (children 1)
  Function TinyLog