Adding upstream version 15.5.upstream/15.5

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 555 insertions, 0 deletions

diff --git a/contrib/ltree/_ltree_gist.c b/contrib/ltree/_ltree_gist.c
new file mode 100644
index 0000000..72516c3
--- /dev/null
+++ b/contrib/ltree/_ltree_gist.c
@@ -0,0 +1,555 @@
+/*
+ * contrib/ltree/_ltree_gist.c
+ *
+ *
+ * GiST support for ltree[]
+ * Teodor Sigaev <teodor@stack.net>
+ */
+#include "postgres.h"
+
+#include "access/gist.h"
+#include "access/reloptions.h"
+#include "access/stratnum.h"
+#include "crc32.h"
+#include "ltree.h"
+#include "port/pg_bitutils.h"
+
+PG_FUNCTION_INFO_V1(_ltree_compress);
+PG_FUNCTION_INFO_V1(_ltree_same);
+PG_FUNCTION_INFO_V1(_ltree_union);
+PG_FUNCTION_INFO_V1(_ltree_penalty);
+PG_FUNCTION_INFO_V1(_ltree_picksplit);
+PG_FUNCTION_INFO_V1(_ltree_consistent);
+PG_FUNCTION_INFO_V1(_ltree_gist_options);
+
+#define GETENTRY(vec,pos) ((ltree_gist *) DatumGetPointer((vec)->vector[(pos)].key))
+#define NEXTVAL(x) ( (ltree*)( (char*)(x) + INTALIGN( VARSIZE(x) ) ) )
+
+#define WISH_F(a,b,c) (double)( -(double)(((a)-(b))*((a)-(b))*((a)-(b)))*(c) )
+
+
+static void
+hashing(BITVECP sign, ltree *t, int siglen)
+{
+	int			tlen = t->numlevel;
+	ltree_level *cur = LTREE_FIRST(t);
+	int			hash;
+
+	while (tlen > 0)
+	{
+		hash = ltree_crc32_sz(cur->name, cur->len);
+		AHASH(sign, hash, siglen);
+		cur = LEVEL_NEXT(cur);
+		tlen--;
+	}
+}
+
+Datum
+_ltree_compress(PG_FUNCTION_ARGS)
+{
+	GISTENTRY  *entry = (GISTENTRY *) PG_GETARG_POINTER(0);
+	GISTENTRY  *retval = entry;
+	int			siglen = LTREE_GET_ASIGLEN();
+
+	if (entry->leafkey)
+	{							/* ltree */
+		ltree_gist *key;
+		ArrayType  *val = DatumGetArrayTypeP(entry->key);
+		int			num = ArrayGetNItems(ARR_NDIM(val), ARR_DIMS(val));
+		ltree	   *item = (ltree *) ARR_DATA_PTR(val);
+
+		if (ARR_NDIM(val) > 1)
+			ereport(ERROR,
+					(errcode(ERRCODE_ARRAY_SUBSCRIPT_ERROR),
+					 errmsg("array must be one-dimensional")));
+		if (array_contains_nulls(val))
+			ereport(ERROR,
+					(errcode(ERRCODE_NULL_VALUE_NOT_ALLOWED),
+					 errmsg("array must not contain nulls")));
+
+		key = ltree_gist_alloc(false, NULL, siglen, NULL, NULL);
+
+		while (num > 0)
+		{
+			hashing(LTG_SIGN(key), item, siglen);
+			num--;
+			item = NEXTVAL(item);
+		}
+
+		retval = (GISTENTRY *) palloc(sizeof(GISTENTRY));
+		gistentryinit(*retval, PointerGetDatum(key),
+					  entry->rel, entry->page,
+					  entry->offset, false);
+	}
+	else if (!LTG_ISALLTRUE(entry->key))
+	{
+		int32		i;
+		ltree_gist *key;
+		BITVECP		sign = LTG_SIGN(DatumGetPointer(entry->key));
+
+		ALOOPBYTE(siglen)
+		{
+			if ((sign[i] & 0xff) != 0xff)
+				PG_RETURN_POINTER(retval);
+		}
+
+		key = ltree_gist_alloc(true, sign, siglen, NULL, NULL);
+		retval = (GISTENTRY *) palloc(sizeof(GISTENTRY));
+		gistentryinit(*retval, PointerGetDatum(key),
+					  entry->rel, entry->page,
+					  entry->offset, false);
+	}
+	PG_RETURN_POINTER(retval);
+}
+
+Datum
+_ltree_same(PG_FUNCTION_ARGS)
+{
+	ltree_gist *a = (ltree_gist *) PG_GETARG_POINTER(0);
+	ltree_gist *b = (ltree_gist *) PG_GETARG_POINTER(1);
+	bool	   *result = (bool *) PG_GETARG_POINTER(2);
+	int			siglen = LTREE_GET_ASIGLEN();
+
+	if (LTG_ISALLTRUE(a) && LTG_ISALLTRUE(b))
+		*result = true;
+	else if (LTG_ISALLTRUE(a))
+		*result = false;
+	else if (LTG_ISALLTRUE(b))
+		*result = false;
+	else
+	{
+		int32		i;
+		BITVECP		sa = LTG_SIGN(a),
+					sb = LTG_SIGN(b);
+
+		*result = true;
+		ALOOPBYTE(siglen)
+		{
+			if (sa[i] != sb[i])
+			{
+				*result = false;
+				break;
+			}
+		}
+	}
+	PG_RETURN_POINTER(result);
+}
+
+static int32
+unionkey(BITVECP sbase, ltree_gist *add, int siglen)
+{
+	int32		i;
+	BITVECP		sadd = LTG_SIGN(add);
+
+	if (LTG_ISALLTRUE(add))
+		return 1;
+
+	ALOOPBYTE(siglen)
+		sbase[i] |= sadd[i];
+	return 0;
+}
+
+Datum
+_ltree_union(PG_FUNCTION_ARGS)
+{
+	GistEntryVector *entryvec = (GistEntryVector *) PG_GETARG_POINTER(0);
+	int		   *size = (int *) PG_GETARG_POINTER(1);
+	int			siglen = LTREE_GET_ASIGLEN();
+	int32		i;
+	ltree_gist *result = ltree_gist_alloc(false, NULL, siglen, NULL, NULL);
+	BITVECP		base = LTG_SIGN(result);
+
+	for (i = 0; i < entryvec->n; i++)
+	{
+		if (unionkey(base, GETENTRY(entryvec, i), siglen))
+		{
+			result->flag |= LTG_ALLTRUE;
+			SET_VARSIZE(result, LTG_HDRSIZE);
+			break;
+		}
+	}
+
+	*size = VARSIZE(result);
+
+	PG_RETURN_POINTER(result);
+}
+
+static int32
+sizebitvec(BITVECP sign, int siglen)
+{
+	return pg_popcount((const char *) sign, siglen);
+}
+
+static int
+hemdistsign(BITVECP a, BITVECP b, int siglen)
+{
+	int			i,
+				diff,
+				dist = 0;
+
+	ALOOPBYTE(siglen)
+	{
+		diff = (unsigned char) (a[i] ^ b[i]);
+		/* Using the popcount functions here isn't likely to win */
+		dist += pg_number_of_ones[diff];
+	}
+	return dist;
+}
+
+static int
+hemdist(ltree_gist *a, ltree_gist *b, int siglen)
+{
+	if (LTG_ISALLTRUE(a))
+	{
+		if (LTG_ISALLTRUE(b))
+			return 0;
+		else
+			return ASIGLENBIT(siglen) - sizebitvec(LTG_SIGN(b), siglen);
+	}
+	else if (LTG_ISALLTRUE(b))
+		return ASIGLENBIT(siglen) - sizebitvec(LTG_SIGN(a), siglen);
+
+	return hemdistsign(LTG_SIGN(a), LTG_SIGN(b), siglen);
+}
+
+
+Datum
+_ltree_penalty(PG_FUNCTION_ARGS)
+{
+	ltree_gist *origval = (ltree_gist *) DatumGetPointer(((GISTENTRY *) PG_GETARG_POINTER(0))->key);
+	ltree_gist *newval = (ltree_gist *) DatumGetPointer(((GISTENTRY *) PG_GETARG_POINTER(1))->key);
+	float	   *penalty = (float *) PG_GETARG_POINTER(2);
+	int			siglen = LTREE_GET_ASIGLEN();
+
+	*penalty = hemdist(origval, newval, siglen);
+	PG_RETURN_POINTER(penalty);
+}
+
+typedef struct
+{
+	OffsetNumber pos;
+	int32		cost;
+} SPLITCOST;
+
+static int
+comparecost(const void *a, const void *b)
+{
+	return ((const SPLITCOST *) a)->cost - ((const SPLITCOST *) b)->cost;
+}
+
+Datum
+_ltree_picksplit(PG_FUNCTION_ARGS)
+{
+	GistEntryVector *entryvec = (GistEntryVector *) PG_GETARG_POINTER(0);
+	GIST_SPLITVEC *v = (GIST_SPLITVEC *) PG_GETARG_POINTER(1);
+	int			siglen = LTREE_GET_ASIGLEN();
+	OffsetNumber k,
+				j;
+	ltree_gist *datum_l,
+			   *datum_r;
+	BITVECP		union_l,
+				union_r;
+	int32		size_alpha,
+				size_beta;
+	int32		size_waste,
+				waste = -1;
+	int32		nbytes;
+	OffsetNumber seed_1 = 0,
+				seed_2 = 0;
+	OffsetNumber *left,
+			   *right;
+	OffsetNumber maxoff;
+	BITVECP		ptr;
+	int			i;
+	SPLITCOST  *costvector;
+	ltree_gist *_k,
+			   *_j;
+
+	maxoff = entryvec->n - 2;
+	nbytes = (maxoff + 2) * sizeof(OffsetNumber);
+	v->spl_left = (OffsetNumber *) palloc(nbytes);
+	v->spl_right = (OffsetNumber *) palloc(nbytes);
+
+	for (k = FirstOffsetNumber; k < maxoff; k = OffsetNumberNext(k))
+	{
+		_k = GETENTRY(entryvec, k);
+		for (j = OffsetNumberNext(k); j <= maxoff; j = OffsetNumberNext(j))
+		{
+			size_waste = hemdist(_k, GETENTRY(entryvec, j), siglen);
+			if (size_waste > waste)
+			{
+				waste = size_waste;
+				seed_1 = k;
+				seed_2 = j;
+			}
+		}
+	}
+
+	left = v->spl_left;
+	v->spl_nleft = 0;
+	right = v->spl_right;
+	v->spl_nright = 0;
+
+	if (seed_1 == 0 || seed_2 == 0)
+	{
+		seed_1 = 1;
+		seed_2 = 2;
+	}
+
+	/* form initial .. */
+	datum_l = ltree_gist_alloc(LTG_ISALLTRUE(GETENTRY(entryvec, seed_1)),
+							   LTG_SIGN(GETENTRY(entryvec, seed_1)),
+							   siglen, NULL, NULL);
+
+	datum_r = ltree_gist_alloc(LTG_ISALLTRUE(GETENTRY(entryvec, seed_2)),
+							   LTG_SIGN(GETENTRY(entryvec, seed_2)),
+							   siglen, NULL, NULL);
+
+	maxoff = OffsetNumberNext(maxoff);
+	/* sort before ... */
+	costvector = (SPLITCOST *) palloc(sizeof(SPLITCOST) * maxoff);
+	for (j = FirstOffsetNumber; j <= maxoff; j = OffsetNumberNext(j))
+	{
+		costvector[j - 1].pos = j;
+		_j = GETENTRY(entryvec, j);
+		size_alpha = hemdist(datum_l, _j, siglen);
+		size_beta = hemdist(datum_r, _j, siglen);
+		costvector[j - 1].cost = Abs(size_alpha - size_beta);
+	}
+	qsort((void *) costvector, maxoff, sizeof(SPLITCOST), comparecost);
+
+	union_l = LTG_SIGN(datum_l);
+	union_r = LTG_SIGN(datum_r);
+
+	for (k = 0; k < maxoff; k++)
+	{
+		j = costvector[k].pos;
+		if (j == seed_1)
+		{
+			*left++ = j;
+			v->spl_nleft++;
+			continue;
+		}
+		else if (j == seed_2)
+		{
+			*right++ = j;
+			v->spl_nright++;
+			continue;
+		}
+		_j = GETENTRY(entryvec, j);
+		size_alpha = hemdist(datum_l, _j, siglen);
+		size_beta = hemdist(datum_r, _j, siglen);
+
+		if (size_alpha < size_beta + WISH_F(v->spl_nleft, v->spl_nright, 0.00001))
+		{
+			if (LTG_ISALLTRUE(datum_l) || LTG_ISALLTRUE(_j))
+			{
+				if (!LTG_ISALLTRUE(datum_l))
+					MemSet((void *) union_l, 0xff, siglen);
+			}
+			else
+			{
+				ptr = LTG_SIGN(_j);
+				ALOOPBYTE(siglen)
+					union_l[i] |= ptr[i];
+			}
+			*left++ = j;
+			v->spl_nleft++;
+		}
+		else
+		{
+			if (LTG_ISALLTRUE(datum_r) || LTG_ISALLTRUE(_j))
+			{
+				if (!LTG_ISALLTRUE(datum_r))
+					MemSet((void *) union_r, 0xff, siglen);
+			}
+			else
+			{
+				ptr = LTG_SIGN(_j);
+				ALOOPBYTE(siglen)
+					union_r[i] |= ptr[i];
+			}
+			*right++ = j;
+			v->spl_nright++;
+		}
+	}
+
+	*right = *left = FirstOffsetNumber;
+
+	v->spl_ldatum = PointerGetDatum(datum_l);
+	v->spl_rdatum = PointerGetDatum(datum_r);
+
+	PG_RETURN_POINTER(v);
+}
+
+static bool
+gist_te(ltree_gist *key, ltree *query, int siglen)
+{
+	ltree_level *curq = LTREE_FIRST(query);
+	BITVECP		sign = LTG_SIGN(key);
+	int			qlen = query->numlevel;
+	unsigned int hv;
+
+	if (LTG_ISALLTRUE(key))
+		return true;
+
+	while (qlen > 0)
+	{
+		hv = ltree_crc32_sz(curq->name, curq->len);
+		if (!GETBIT(sign, AHASHVAL(hv, siglen)))
+			return false;
+		curq = LEVEL_NEXT(curq);
+		qlen--;
+	}
+
+	return true;
+}
+
+typedef struct LtreeSignature
+{
+	BITVECP		sign;
+	int			siglen;
+} LtreeSignature;
+
+static bool
+checkcondition_bit(void *cxt, ITEM *val)
+{
+	LtreeSignature *sig = cxt;
+
+	return (FLG_CANLOOKSIGN(val->flag)) ? GETBIT(sig->sign, AHASHVAL(val->val, sig->siglen)) : true;
+}
+
+static bool
+gist_qtxt(ltree_gist *key, ltxtquery *query, int siglen)
+{
+	LtreeSignature sig;
+
+	if (LTG_ISALLTRUE(key))
+		return true;
+
+	sig.sign = LTG_SIGN(key);
+	sig.siglen = siglen;
+
+	return ltree_execute(GETQUERY(query),
+						 &sig, false,
+						 checkcondition_bit);
+}
+
+static bool
+gist_qe(ltree_gist *key, lquery *query, int siglen)
+{
+	lquery_level *curq = LQUERY_FIRST(query);
+	BITVECP		sign = LTG_SIGN(key);
+	int			qlen = query->numlevel;
+
+	if (LTG_ISALLTRUE(key))
+		return true;
+
+	while (qlen > 0)
+	{
+		if (curq->numvar && LQL_CANLOOKSIGN(curq))
+		{
+			bool		isexist = false;
+			int			vlen = curq->numvar;
+			lquery_variant *curv = LQL_FIRST(curq);
+
+			while (vlen > 0)
+			{
+				if (GETBIT(sign, AHASHVAL(curv->val, siglen)))
+				{
+					isexist = true;
+					break;
+				}
+				curv = LVAR_NEXT(curv);
+				vlen--;
+			}
+			if (!isexist)
+				return false;
+		}
+
+		curq = LQL_NEXT(curq);
+		qlen--;
+	}
+
+	return true;
+}
+
+static bool
+_arrq_cons(ltree_gist *key, ArrayType *_query, int siglen)
+{
+	lquery	   *query = (lquery *) ARR_DATA_PTR(_query);
+	int			num = ArrayGetNItems(ARR_NDIM(_query), ARR_DIMS(_query));
+
+	if (ARR_NDIM(_query) > 1)
+		ereport(ERROR,
+				(errcode(ERRCODE_ARRAY_SUBSCRIPT_ERROR),
+				 errmsg("array must be one-dimensional")));
+	if (array_contains_nulls(_query))
+		ereport(ERROR,
+				(errcode(ERRCODE_NULL_VALUE_NOT_ALLOWED),
+				 errmsg("array must not contain nulls")));
+
+	while (num > 0)
+	{
+		if (gist_qe(key, query, siglen))
+			return true;
+		num--;
+		query = (lquery *) NEXTVAL(query);
+	}
+	return false;
+}
+
+Datum
+_ltree_consistent(PG_FUNCTION_ARGS)
+{
+	GISTENTRY  *entry = (GISTENTRY *) PG_GETARG_POINTER(0);
+	void	   *query = (void *) PG_DETOAST_DATUM(PG_GETARG_DATUM(1));
+	StrategyNumber strategy = (StrategyNumber) PG_GETARG_UINT16(2);
+
+	/* Oid		subtype = PG_GETARG_OID(3); */
+	bool	   *recheck = (bool *) PG_GETARG_POINTER(4);
+	int			siglen = LTREE_GET_ASIGLEN();
+	ltree_gist *key = (ltree_gist *) DatumGetPointer(entry->key);
+	bool		res = false;
+
+	/* All cases served by this function are inexact */
+	*recheck = true;
+
+	switch (strategy)
+	{
+		case 10:
+		case 11:
+			res = gist_te(key, (ltree *) query, siglen);
+			break;
+		case 12:
+		case 13:
+			res = gist_qe(key, (lquery *) query, siglen);
+			break;
+		case 14:
+		case 15:
+			res = gist_qtxt(key, (ltxtquery *) query, siglen);
+			break;
+		case 16:
+		case 17:
+			res = _arrq_cons(key, (ArrayType *) query, siglen);
+			break;
+		default:
+			/* internal error */
+			elog(ERROR, "unrecognized StrategyNumber: %d", strategy);
+	}
+	PG_FREE_IF_COPY(query, 1);
+	PG_RETURN_BOOL(res);
+}
+
+Datum
+_ltree_gist_options(PG_FUNCTION_ARGS)
+{
+	local_relopts *relopts = (local_relopts *) PG_GETARG_POINTER(0);
+
+	init_local_reloptions(relopts, sizeof(LtreeGistOptions));
+	add_local_int_reloption(relopts, "siglen", "signature length",
+							LTREE_ASIGLEN_DEFAULT, 1, LTREE_ASIGLEN_MAX,
+							offsetof(LtreeGistOptions, siglen));
+
+	PG_RETURN_VOID();
+}