AlterQuery  minmax_idx (children 2)
 ExpressionList (children 1)
  AlterCommand ADD_INDEX (children 2)
   Index (children 2)
    Function minus (children 1)
     ExpressionList (children 2)
      Identifier u64
      Identifier i32
    Function minmax (children 1)
     ExpressionList
   Identifier idx1
 Identifier minmax_idx