1 files changed, 297 insertions, 0 deletions
diff --git a/contrib/btree_gist/btree_interval.c b/contrib/btree_gist/btree_interval.c
new file mode 100644
index 0000000..c2bf820
--- /dev/null
+++ b/contrib/btree_gist/btree_interval.c
@@ -0,0 +1,297 @@
+/*
+ * contrib/btree_gist/btree_interval.c
+ */
+#include "postgres.h"
+
+#include "btree_gist.h"
+#include "btree_utils_num.h"
+#include "utils/builtins.h"
+#include "utils/timestamp.h"
+
+typedef struct
+{
+	Interval	lower,
+				upper;
+} intvKEY;
+
+
+/*
+** Interval ops
+*/
+PG_FUNCTION_INFO_V1(gbt_intv_compress);
+PG_FUNCTION_INFO_V1(gbt_intv_fetch);
+PG_FUNCTION_INFO_V1(gbt_intv_decompress);
+PG_FUNCTION_INFO_V1(gbt_intv_union);
+PG_FUNCTION_INFO_V1(gbt_intv_picksplit);
+PG_FUNCTION_INFO_V1(gbt_intv_consistent);
+PG_FUNCTION_INFO_V1(gbt_intv_distance);
+PG_FUNCTION_INFO_V1(gbt_intv_penalty);
+PG_FUNCTION_INFO_V1(gbt_intv_same);
+
+
+static bool
+gbt_intvgt(const void *a, const void *b, FmgrInfo *flinfo)
+{
+	return DatumGetBool(DirectFunctionCall2(interval_gt, IntervalPGetDatum(a), IntervalPGetDatum(b)));
+}
+
+static bool
+gbt_intvge(const void *a, const void *b, FmgrInfo *flinfo)
+{
+	return DatumGetBool(DirectFunctionCall2(interval_ge, IntervalPGetDatum(a), IntervalPGetDatum(b)));
+}
+
+static bool
+gbt_intveq(const void *a, const void *b, FmgrInfo *flinfo)
+{
+	return DatumGetBool(DirectFunctionCall2(interval_eq, IntervalPGetDatum(a), IntervalPGetDatum(b)));
+}
+
+static bool
+gbt_intvle(const void *a, const void *b, FmgrInfo *flinfo)
+{
+	return DatumGetBool(DirectFunctionCall2(interval_le, IntervalPGetDatum(a), IntervalPGetDatum(b)));
+}
+
+static bool
+gbt_intvlt(const void *a, const void *b, FmgrInfo *flinfo)
+{
+	return DatumGetBool(DirectFunctionCall2(interval_lt, IntervalPGetDatum(a), IntervalPGetDatum(b)));
+}
+
+static int
+gbt_intvkey_cmp(const void *a, const void *b, FmgrInfo *flinfo)
+{
+	intvKEY    *ia = (intvKEY *) (((const Nsrt *) a)->t);
+	intvKEY    *ib = (intvKEY *) (((const Nsrt *) b)->t);
+	int			res;
+
+	res = DatumGetInt32(DirectFunctionCall2(interval_cmp, IntervalPGetDatum(&ia->lower), IntervalPGetDatum(&ib->lower)));
+	if (res == 0)
+		return DatumGetInt32(DirectFunctionCall2(interval_cmp, IntervalPGetDatum(&ia->upper), IntervalPGetDatum(&ib->upper)));
+
+	return res;
+}
+
+
+static double
+intr2num(const Interval *i)
+{
+	return INTERVAL_TO_SEC(i);
+}
+
+static float8
+gbt_intv_dist(const void *a, const void *b, FmgrInfo *flinfo)
+{
+	return (float8) Abs(intr2num((const Interval *) a) - intr2num((const Interval *) b));
+}
+
+/*
+ * INTERVALSIZE should be the actual size-on-disk of an Interval, as shown
+ * in pg_type.  This might be less than sizeof(Interval) if the compiler
+ * insists on adding alignment padding at the end of the struct.  (Note:
+ * this concern is obsolete with the current definition of Interval, but
+ * was real before a separate "day" field was added to it.)
+ */
+#define INTERVALSIZE 16
+
+static const gbtree_ninfo tinfo =
+{
+	gbt_t_intv,
+	sizeof(Interval),
+	32,							/* sizeof(gbtreekey32) */
+	gbt_intvgt,
+	gbt_intvge,
+	gbt_intveq,
+	gbt_intvle,
+	gbt_intvlt,
+	gbt_intvkey_cmp,
+	gbt_intv_dist
+};
+
+
+Interval *
+abs_interval(Interval *a)
+{
+	static Interval zero = {0, 0, 0};
+
+	if (DatumGetBool(DirectFunctionCall2(interval_lt,
+										 IntervalPGetDatum(a),
+										 IntervalPGetDatum(&zero))))
+		a = DatumGetIntervalP(DirectFunctionCall1(interval_um,
+												  IntervalPGetDatum(a)));
+
+	return a;
+}
+
+PG_FUNCTION_INFO_V1(interval_dist);
+Datum
+interval_dist(PG_FUNCTION_ARGS)
+{
+	Datum		diff = DirectFunctionCall2(interval_mi,
+										   PG_GETARG_DATUM(0),
+										   PG_GETARG_DATUM(1));
+
+	PG_RETURN_INTERVAL_P(abs_interval(DatumGetIntervalP(diff)));
+}
+
+
+/**************************************************
+ * interval ops
+ **************************************************/
+
+
+Datum
+gbt_intv_compress(PG_FUNCTION_ARGS)
+{
+	GISTENTRY  *entry = (GISTENTRY *) PG_GETARG_POINTER(0);
+	GISTENTRY  *retval = entry;
+
+	if (entry->leafkey || INTERVALSIZE != sizeof(Interval))
+	{
+		char	   *r = (char *) palloc(2 * INTERVALSIZE);
+
+		retval = palloc(sizeof(GISTENTRY));
+
+		if (entry->leafkey)
+		{
+			Interval   *key = DatumGetIntervalP(entry->key);
+
+			memcpy((void *) r, (void *) key, INTERVALSIZE);
+			memcpy((void *) (r + INTERVALSIZE), (void *) key, INTERVALSIZE);
+		}
+		else
+		{
+			intvKEY    *key = (intvKEY *) DatumGetPointer(entry->key);
+
+			memcpy(r, &key->lower, INTERVALSIZE);
+			memcpy(r + INTERVALSIZE, &key->upper, INTERVALSIZE);
+		}
+		gistentryinit(*retval, PointerGetDatum(r),
+					  entry->rel, entry->page,
+					  entry->offset, false);
+	}
+
+	PG_RETURN_POINTER(retval);
+}
+
+Datum
+gbt_intv_fetch(PG_FUNCTION_ARGS)
+{
+	GISTENTRY  *entry = (GISTENTRY *) PG_GETARG_POINTER(0);
+
+	PG_RETURN_POINTER(gbt_num_fetch(entry, &tinfo));
+}
+
+Datum
+gbt_intv_decompress(PG_FUNCTION_ARGS)
+{
+	GISTENTRY  *entry = (GISTENTRY *) PG_GETARG_POINTER(0);
+	GISTENTRY  *retval = entry;
+
+	if (INTERVALSIZE != sizeof(Interval))
+	{
+		intvKEY    *r = palloc(sizeof(intvKEY));
+		char	   *key = DatumGetPointer(entry->key);
+
+		retval = palloc(sizeof(GISTENTRY));
+		memcpy(&r->lower, key, INTERVALSIZE);
+		memcpy(&r->upper, key + INTERVALSIZE, INTERVALSIZE);
+
+		gistentryinit(*retval, PointerGetDatum(r),
+					  entry->rel, entry->page,
+					  entry->offset, false);
+	}
+	PG_RETURN_POINTER(retval);
+}
+
+
+Datum
+gbt_intv_consistent(PG_FUNCTION_ARGS)
+{
+	GISTENTRY  *entry = (GISTENTRY *) PG_GETARG_POINTER(0);
+	Interval   *query = PG_GETARG_INTERVAL_P(1);
+	StrategyNumber strategy = (StrategyNumber) PG_GETARG_UINT16(2);
+
+	/* Oid		subtype = PG_GETARG_OID(3); */
+	bool	   *recheck = (bool *) PG_GETARG_POINTER(4);
+	intvKEY    *kkk = (intvKEY *) 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_intv_distance(PG_FUNCTION_ARGS)
+{
+	GISTENTRY  *entry = (GISTENTRY *) PG_GETARG_POINTER(0);
+	Interval   *query = PG_GETARG_INTERVAL_P(1);
+
+	/* Oid		subtype = PG_GETARG_OID(3); */
+	intvKEY    *kkk = (intvKEY *) DatumGetPointer(entry->key);
+	GBT_NUMKEY_R key;
+
+	key.lower = (GBT_NUMKEY *) &kkk->lower;
+	key.upper = (GBT_NUMKEY *) &kkk->upper;
+
+	PG_RETURN_FLOAT8(gbt_num_distance(&key, (void *) query, GIST_LEAF(entry),
+									  &tinfo, fcinfo->flinfo));
+}
+
+
+Datum
+gbt_intv_union(PG_FUNCTION_ARGS)
+{
+	GistEntryVector *entryvec = (GistEntryVector *) PG_GETARG_POINTER(0);
+	void	   *out = palloc(sizeof(intvKEY));
+
+	*(int *) PG_GETARG_POINTER(1) = sizeof(intvKEY);
+	PG_RETURN_POINTER(gbt_num_union((void *) out, entryvec, &tinfo, fcinfo->flinfo));
+}
+
+
+Datum
+gbt_intv_penalty(PG_FUNCTION_ARGS)
+{
+	intvKEY    *origentry = (intvKEY *) DatumGetPointer(((GISTENTRY *) PG_GETARG_POINTER(0))->key);
+	intvKEY    *newentry = (intvKEY *) DatumGetPointer(((GISTENTRY *) PG_GETARG_POINTER(1))->key);
+	float	   *result = (float *) PG_GETARG_POINTER(2);
+	double		iorg[2],
+				inew[2];
+
+	iorg[0] = intr2num(&origentry->lower);
+	iorg[1] = intr2num(&origentry->upper);
+	inew[0] = intr2num(&newentry->lower);
+	inew[1] = intr2num(&newentry->upper);
+
+	penalty_num(result, iorg[0], iorg[1], inew[0], inew[1]);
+
+	PG_RETURN_POINTER(result);
+}
+
+Datum
+gbt_intv_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_intv_same(PG_FUNCTION_ARGS)
+{
+	intvKEY    *b1 = (intvKEY *) PG_GETARG_POINTER(0);
+	intvKEY    *b2 = (intvKEY *) 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);
+}