CreateQuery test_string (children 3)
 Identifier test_string
 Columns definition (children 1)
  ExpressionList (children 3)
   ColumnDeclaration id (children 1)
    DataType UInt64
   ColumnDeclaration unhexed (children 2)
    DataType String
    Function defaultValueOfTypeName
   ColumnDeclaration hexed (children 2)
    DataType FixedString (children 1)
     ExpressionList (children 1)
      Literal UInt64_4
    Function unhex (children 1)
     ExpressionList (children 1)
      Identifier unhexed
 Storage definition (children 3)
  Function MergeTree
  Identifier id
  Set
