31 typedef struct TypeCacheEntry  struct
34 	Oid			type_id;		/* OID of the data type */
37 	int16		typlen;
38 	bool		typbyval;
39 	char		typalign;
40 	char		typstorage;
41 	char		typtype;
42 	Oid			typrelid;
43 	Oid			typelem;
44 	Oid			typcollation;
54 	Oid			btree_opf;		/* the default btree opclass' family */
55 	Oid			btree_opintype; /* the default btree opclass' opcintype */
56 	Oid			hash_opf;		/* the default hash opclass' family */
57 	Oid			hash_opintype;	/* the default hash opclass' opcintype */
58 	Oid			eq_opr;			/* the equality operator */
59 	Oid			lt_opr;			/* the less-than operator */
60 	Oid			gt_opr;			/* the greater-than operator */
61 	Oid			cmp_proc;		/* the btree comparison function */
62 	Oid			hash_proc;		/* the hash calculation function */
63 	Oid			hash_extended_proc; /* the extended hash calculation function */
95 	struct TypeCacheEntry *rngelemtype; /* range's element type */  argument
96 	Oid			rng_collation;	/* collation for comparisons, if any */
97 	FmgrInfo	rng_cmp_proc_finfo; /* comparison function */
98 	FmgrInfo	rng_canonical_finfo;	/* canonicalization function, if any */
99 	FmgrInfo	rng_subdiff_finfo;	/* difference function, if any */
124 	struct TypeCacheEntry *nextDomain;  argument
125 } TypeCacheEntry;  typedef