fix: set length of RecordMat::token with NAMEDATALEN (#17)

The length of `NAME` type can be customized in
`include/pg_config_manual.h` from postgre. It's better to use macro from
postgres instead of hard coding.

Signed-off-by: Mingzhuo Yin <[email protected]>

src/lib.rs

@@ -34,7 +34,7 @@ pub fn tokenize(t: &str) -> Vec<String> {
 #[derive(Debug)]
 #[repr(C)]
 struct RecordMat {
-    token: [u8; 64],
+    token: [u8; pgrx::pg_sys::NAMEDATALEN as usize],
     id: i32,
     how_many_tokens: i32,
     idf: f32,