CreateQuery ttl (children 3)
 Identifier ttl
 Columns definition (children 1)
  ExpressionList (children 2)
   ColumnDeclaration i (children 1)
    DataType Int
   ColumnDeclaration s (children 1)
    DataType String
 Storage definition (children 3)
  Function MergeTree
  Identifier i
  ExpressionList (children 1)
   TTLElement (children 1)
    Function toDate (children 1)
     ExpressionList (children 1)
      Literal \'2000-01-01\'