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val eqb : char list -> char list -> bool
type attr_name = char list
type relation = { rel_name : char list; rel_finite : bool }
type database = (char list * relation) list
val db_lookup : char list -> database -> relation option
type literal =
| LitInt of int
| LitStr of char list
| LitBool of bool
type query =
| Base of char list
| Const of (attr_name * literal) list
| Select of query * query
| Join of attr_name list * query * query
| Cartesian of query * query
| Project of attr_name list * query
| Rename of (attr_name * attr_name) list * query
| Union of query * query
| Diff of query * query
| Take of int * query
val predicted_finite : database -> query -> bool option
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