SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 3)
   ExpressionList (children 1)
    Function if (children 1)
     ExpressionList (children 3)
      Function less (children 1)
       ExpressionList (children 2)
        Identifier memory_usage
        Literal UInt64_300000000
      Literal \'Ok\'
      Function format (children 1)
       ExpressionList (children 2)
        Literal \'Fail: memory usage {}\'
        Function formatReadableSize (children 1)
         ExpressionList (children 1)
          Identifier memory_usage
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier system.query_log
   Function and (children 1)
    ExpressionList (children 3)
     Function equals (children 1)
      ExpressionList (children 2)
       Identifier current_database
       Function currentDatabase (children 1)
        ExpressionList
     Function like (children 1)
      ExpressionList (children 2)
       Identifier query
       Literal \'INSERT INTO t_100_columns%\'
     Function equals (children 1)
      ExpressionList (children 2)
       Identifier type
       Literal \'QueryFinish\'
