AlterQuery  ttl (children 2)
 ExpressionList (children 1)
  AlterCommand MODIFY_COLUMN (children 1)
   ColumnDeclaration s (children 2)
    DataType String
    Function if (children 1)
     ExpressionList (children 3)
      Function equals (children 1)
       ExpressionList (children 2)
        Function modulo (children 1)
         ExpressionList (children 2)
          Identifier i
          Literal UInt64_2
        Literal UInt64_0
      Function minus (children 1)
       ExpressionList (children 2)
        Function today (children 1)
         ExpressionList
        Literal UInt64_10
      Function toDate (children 1)
       ExpressionList (children 1)
        Literal \'2100-01-01\'
 Identifier ttl