SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 3)
   ExpressionList (children 1)
    Function sum (children 1)
     ExpressionList (children 1)
      Function ignore (children 1)
       ExpressionList (children 4)
        Asterisk
        Identifier metadata_modification_time
        Identifier engine_full
        Identifier create_table_query
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier system.tables
   Function equals (children 1)
    ExpressionList (children 2)
     Identifier database
     Literal \'{CLICKHOUSE_DATABASE:String}\'
