SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 3)
   ExpressionList (children 3)
    Identifier name
    Identifier database
    Identifier element_count
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier system.dictionaries
   Function and (children 1)
    ExpressionList (children 2)
     Function equals (children 1)
      ExpressionList (children 2)
       Identifier database
       Literal \'test_truncate_database\'
     Function equals (children 1)
      ExpressionList (children 2)
       Identifier name
       Literal \'dest_dictionary\'
