AlterQuery  index_test (children 2)
 ExpressionList (children 4)
  AlterCommand ADD_INDEX (children 1)
   Index (children 2)
    Function tupleElement (children 1)
     ExpressionList (children 2)
      Function mortonDecode (children 1)
       ExpressionList (children 2)
        Literal UInt64_2
        Identifier z
      Literal UInt64_1
    Function minmax (children 1)
     ExpressionList
  AlterCommand ADD_INDEX (children 1)
   Index (children 2)
    Function tupleElement (children 1)
     ExpressionList (children 2)
      Function mortonDecode (children 1)
       ExpressionList (children 2)
        Literal UInt64_2
        Identifier z
      Literal UInt64_2
    Function minmax (children 1)
     ExpressionList
  AlterCommand MATERIALIZE_INDEX (children 1)
   Identifier i_x
  AlterCommand MATERIALIZE_INDEX (children 1)
   Identifier i_y
 Identifier index_test
