CreateQuery t1__fuzz_4 (children 3)
 Identifier t1__fuzz_4
 Columns definition (children 1)
  ExpressionList (children 2)
   ColumnDeclaration x (children 1)
    DataType Nullable (children 1)
     ExpressionList (children 1)
      DataType UInt32
   ColumnDeclaration y (children 1)
    DataType Int64
 Storage definition (children 3)
  Function MergeTree
  Function tuple (children 1)
   ExpressionList (children 2)
    Identifier x
    Identifier y
  Set
