1 files changed, 235 insertions, 0 deletions
diff --git a/contrib/btree_gist/btree_uuid.c b/contrib/btree_gist/btree_uuid.c
new file mode 100644
index 0000000..b818759
--- /dev/null
+++ b/contrib/btree_gist/btree_uuid.c
@@ -0,0 +1,235 @@
+/*
+ * contrib/btree_gist/btree_uuid.c
+ */
+#include "postgres.h"
+
+#include "btree_gist.h"
+#include "btree_utils_num.h"
+#include "port/pg_bswap.h"
+#include "utils/uuid.h"
+
+typedef struct
+{
+	pg_uuid_t	lower,
+				upper;
+} uuidKEY;
+
+
+/*
+ * UUID ops
+ */
+PG_FUNCTION_INFO_V1(gbt_uuid_compress);
+PG_FUNCTION_INFO_V1(gbt_uuid_fetch);
+PG_FUNCTION_INFO_V1(gbt_uuid_union);
+PG_FUNCTION_INFO_V1(gbt_uuid_picksplit);
+PG_FUNCTION_INFO_V1(gbt_uuid_consistent);
+PG_FUNCTION_INFO_V1(gbt_uuid_penalty);
+PG_FUNCTION_INFO_V1(gbt_uuid_same);
+
+
+static int
+uuid_internal_cmp(const pg_uuid_t *arg1, const pg_uuid_t *arg2)
+{
+	return memcmp(arg1->data, arg2->data, UUID_LEN);
+}
+
+static bool
+gbt_uuidgt(const void *a, const void *b, FmgrInfo *flinfo)
+{
+	return uuid_internal_cmp((const pg_uuid_t *) a, (const pg_uuid_t *) b) > 0;
+}
+
+static bool
+gbt_uuidge(const void *a, const void *b, FmgrInfo *flinfo)
+{
+	return uuid_internal_cmp((const pg_uuid_t *) a, (const pg_uuid_t *) b) >= 0;
+}
+
+static bool
+gbt_uuideq(const void *a, const void *b, FmgrInfo *flinfo)
+{
+	return uuid_internal_cmp((const pg_uuid_t *) a, (const pg_uuid_t *) b) == 0;
+}
+
+static bool
+gbt_uuidle(const void *a, const void *b, FmgrInfo *flinfo)
+{
+	return uuid_internal_cmp((const pg_uuid_t *) a, (const pg_uuid_t *) b) <= 0;
+}
+
+static bool
+gbt_uuidlt(const void *a, const void *b, FmgrInfo *flinfo)
+{
+	return uuid_internal_cmp((const pg_uuid_t *) a, (const pg_uuid_t *) b) < 0;
+}
+
+static int
+gbt_uuidkey_cmp(const void *a, const void *b, FmgrInfo *flinfo)
+{
+	uuidKEY    *ia = (uuidKEY *) (((const Nsrt *) a)->t);
+	uuidKEY    *ib = (uuidKEY *) (((const Nsrt *) b)->t);
+	int			res;
+
+	res = uuid_internal_cmp(&ia->lower, &ib->lower);
+	if (res == 0)
+		res = uuid_internal_cmp(&ia->upper, &ib->upper);
+	return res;
+}
+
+
+static const gbtree_ninfo tinfo =
+{
+	gbt_t_uuid,
+	UUID_LEN,
+	32,							/* sizeof(gbtreekey32) */
+	gbt_uuidgt,
+	gbt_uuidge,
+	gbt_uuideq,
+	gbt_uuidle,
+	gbt_uuidlt,
+	gbt_uuidkey_cmp,
+	NULL
+};
+
+
+/**************************************************
+ * uuid ops
+ **************************************************/
+
+
+Datum
+gbt_uuid_compress(PG_FUNCTION_ARGS)
+{
+	GISTENTRY  *entry = (GISTENTRY *) PG_GETARG_POINTER(0);
+	GISTENTRY  *retval;
+
+	if (entry->leafkey)
+	{
+		char	   *r = (char *) palloc(2 * UUID_LEN);
+		pg_uuid_t  *key = DatumGetUUIDP(entry->key);
+
+		retval = palloc(sizeof(GISTENTRY));
+
+		memcpy((void *) r, (void *) key, UUID_LEN);
+		memcpy((void *) (r + UUID_LEN), (void *) key, UUID_LEN);
+		gistentryinit(*retval, PointerGetDatum(r),
+					  entry->rel, entry->page,
+					  entry->offset, false);
+	}
+	else
+		retval = entry;
+
+	PG_RETURN_POINTER(retval);
+}
+
+Datum
+gbt_uuid_fetch(PG_FUNCTION_ARGS)
+{
+	GISTENTRY  *entry = (GISTENTRY *) PG_GETARG_POINTER(0);
+
+	PG_RETURN_POINTER(gbt_num_fetch(entry, &tinfo));
+}
+
+Datum
+gbt_uuid_consistent(PG_FUNCTION_ARGS)
+{
+	GISTENTRY  *entry = (GISTENTRY *) PG_GETARG_POINTER(0);
+	pg_uuid_t  *query = PG_GETARG_UUID_P(1);
+	StrategyNumber strategy = (StrategyNumber) PG_GETARG_UINT16(2);
+
+	/* Oid		subtype = PG_GETARG_OID(3); */
+	bool	   *recheck = (bool *) PG_GETARG_POINTER(4);
+	uuidKEY    *kkk = (uuidKEY *) DatumGetPointer(entry->key);
+	GBT_NUMKEY_R key;
+
+	/* All cases served by this function are exact */
+	*recheck = false;
+
+	key.lower = (GBT_NUMKEY *) &kkk->lower;
+	key.upper = (GBT_NUMKEY *) &kkk->upper;
+
+	PG_RETURN_BOOL(gbt_num_consistent(&key, (void *) query, &strategy,
+									  GIST_LEAF(entry), &tinfo,
+									  fcinfo->flinfo));
+}
+
+Datum
+gbt_uuid_union(PG_FUNCTION_ARGS)
+{
+	GistEntryVector *entryvec = (GistEntryVector *) PG_GETARG_POINTER(0);
+	void	   *out = palloc(sizeof(uuidKEY));
+
+	*(int *) PG_GETARG_POINTER(1) = sizeof(uuidKEY);
+	PG_RETURN_POINTER(gbt_num_union((void *) out, entryvec, &tinfo, fcinfo->flinfo));
+}
+
+/*
+ * Convert a uuid to a "double" value for estimating sizes of ranges.
+ */
+static double
+uuid_2_double(const pg_uuid_t *u)
+{
+	uint64		uu[2];
+	const double two64 = 18446744073709551616.0;	/* 2^64 */
+
+	/* Source data may not be suitably aligned, so copy */
+	memcpy(uu, u->data, UUID_LEN);
+
+	/*
+	 * uuid values should be considered as big-endian numbers, since that
+	 * corresponds to how memcmp will compare them.  On a little-endian
+	 * machine, byte-swap each half so we can use native uint64 arithmetic.
+	 */
+#ifndef WORDS_BIGENDIAN
+	uu[0] = pg_bswap64(uu[0]);
+	uu[1] = pg_bswap64(uu[1]);
+#endif
+
+	/*
+	 * 2^128 is about 3.4e38, which in theory could exceed the range of
+	 * "double" (POSIX only requires 1e37).  To avoid any risk of overflow,
+	 * put the decimal point between the two halves rather than treating the
+	 * uuid value as a 128-bit integer.
+	 */
+	return (double) uu[0] + (double) uu[1] / two64;
+}
+
+Datum
+gbt_uuid_penalty(PG_FUNCTION_ARGS)
+{
+	uuidKEY    *origentry = (uuidKEY *) DatumGetPointer(((GISTENTRY *) PG_GETARG_POINTER(0))->key);
+	uuidKEY    *newentry = (uuidKEY *) DatumGetPointer(((GISTENTRY *) PG_GETARG_POINTER(1))->key);
+	float	   *result = (float *) PG_GETARG_POINTER(2);
+	double		olower,
+				oupper,
+				nlower,
+				nupper;
+
+	olower = uuid_2_double(&origentry->lower);
+	oupper = uuid_2_double(&origentry->upper);
+	nlower = uuid_2_double(&newentry->lower);
+	nupper = uuid_2_double(&newentry->upper);
+
+	penalty_num(result, olower, oupper, nlower, nupper);
+
+	PG_RETURN_POINTER(result);
+}
+
+Datum
+gbt_uuid_picksplit(PG_FUNCTION_ARGS)
+{
+	PG_RETURN_POINTER(gbt_num_picksplit((GistEntryVector *) PG_GETARG_POINTER(0),
+										(GIST_SPLITVEC *) PG_GETARG_POINTER(1),
+										&tinfo, fcinfo->flinfo));
+}
+
+Datum
+gbt_uuid_same(PG_FUNCTION_ARGS)
+{
+	uuidKEY    *b1 = (uuidKEY *) PG_GETARG_POINTER(0);
+	uuidKEY    *b2 = (uuidKEY *) PG_GETARG_POINTER(1);
+	bool	   *result = (bool *) PG_GETARG_POINTER(2);
+
+	*result = gbt_num_same((void *) b1, (void *) b2, &tinfo, fcinfo->flinfo);
+	PG_RETURN_POINTER(result);
+}