SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 4)
   ExpressionList (children 1)
    Function sum (children 1)
     ExpressionList (children 1)
      Identifier data_uncompressed_bytes
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier system.columns
   Function and (children 1)
    ExpressionList (children 3)
     Function equals (children 1)
      ExpressionList (children 2)
       Identifier database
       Function currentDatabase (children 1)
        ExpressionList
     Function like (children 1)
      ExpressionList (children 2)
       Identifier table
       Literal \'clear_column_\'
     Function or (children 1)
      ExpressionList (children 2)
       Function equals (children 1)
        ExpressionList (children 2)
         Identifier name
         Literal \'i\'
       Function equals (children 1)
        ExpressionList (children 2)
         Identifier name
         Literal \'s\'
   ExpressionList (children 1)
    Identifier table
