/
_int.c
2219 lines (1903 loc) · 47.7 KB
/
_int.c
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/******************************************************************************
This file contains routines that can be bound to a Postgres backend and
called by the backend in the process of processing queries. The calling
format for these routines is dictated by Postgres architecture.
******************************************************************************/
/*
#define BS_DEBUG
#define GIST_DEBUG
#define GIST_QUERY_DEBUG
*/
#include "postgres.h"
#include <float.h>
#include "access/gist.h"
#include "access/itup.h"
#include "access/rtree.h"
#include "utils/elog.h"
#include "utils/palloc.h"
#include "utils/array.h"
#include "utils/builtins.h"
#include "storage/bufpage.h"
/* number ranges for compression */
#define MAXNUMRANGE 100
#define max(a,b) ((a) > (b) ? (a) : (b))
#define min(a,b) ((a) <= (b) ? (a) : (b))
#define abs(a) ((a) < (0) ? -(a) : (a))
/* dimension of array */
#define NDIM 1
/*
* flags for gist__int_ops, use ArrayType->flags
* which is unused (see array.h)
*/
#define LEAFKEY (1<<31)
#define ISLEAFKEY(x) ( ((ArrayType*)(x))->flags & LEAFKEY )
/* useful macros for accessing int4 arrays */
#define ARRPTR(x) ( (int4 *) ARR_DATA_PTR(x) )
#define ARRNELEMS(x) ArrayGetNItems( ARR_NDIM(x), ARR_DIMS(x))
#define ARRISVOID(x) ( (x) ? ( ( ARR_NDIM(x) == NDIM ) ? ( ( ARRNELEMS( x ) ) ? 0 : 1 ) : ( ( ARR_NDIM(x) ) ? (elog(ERROR,"Array is not one-dimensional: %d dimensions",ARRNELEMS( x )),1) : 0 ) ) : 0 )
#define SORT(x) \
do { \
if ( ARRNELEMS( x ) > 1 ) \
isort( ARRPTR( x ), ARRNELEMS( x ) ); \
} while(0)
#define PREPAREARR(x) \
do { \
if ( ARRNELEMS( x ) > 1 ) \
if ( isort( ARRPTR( x ), ARRNELEMS( x ) ) ) \
x = _int_unique( x ); \
} while(0)
/* "wish" function */
#define WISH_F(a,b,c) (double)( -(double)(((a)-(b))*((a)-(b))*((a)-(b)))*(c) )
/* bigint defines */
#define BITBYTE 8
#define SIGLENINT 64 /* >122 => key will toast, so very slow!!! */
#define SIGLEN ( sizeof(int)*SIGLENINT )
#define SIGLENBIT (SIGLEN*BITBYTE)
typedef char BITVEC[SIGLEN];
typedef char *BITVECP;
#define SIGPTR(x) ( (BITVECP) ARR_DATA_PTR(x) )
#define LOOPBYTE(a) \
for(i=0;i<SIGLEN;i++) {\
a;\
}
#define LOOPBIT(a) \
for(i=0;i<SIGLENBIT;i++) {\
a;\
}
/* beware of multiple evaluation of arguments to these macros! */
#define GETBYTE(x,i) ( *( (BITVECP)(x) + (int)( (i) / BITBYTE ) ) )
#define GETBITBYTE(x,i) ( (*((char*)(x)) >> (i)) & 0x01 )
#define CLRBIT(x,i) GETBYTE(x,i) &= ~( 0x01 << ( (i) % BITBYTE ) )
#define SETBIT(x,i) GETBYTE(x,i) |= ( 0x01 << ( (i) % BITBYTE ) )
#define GETBIT(x,i) ( (GETBYTE(x,i) >> ( (i) % BITBYTE )) & 0x01 )
#define HASHVAL(val) (((unsigned int)(val)) % SIGLENBIT)
#define HASH(sign, val) SETBIT((sign), HASHVAL(val))
#ifdef GIST_DEBUG
static void
printarr(ArrayType *a, int num)
{
char bbb[16384];
char *cur;
int l;
int *d;
d = ARRPTR(a);
*bbb = '\0';
cur = bbb;
for (l = 0; l < min(num, ARRNELEMS(a)); l++)
{
sprintf(cur, "%d ", d[l]);
cur = strchr(cur, '\0');
}
elog(NOTICE, "\t\t%s", bbb);
}
static void
printbitvec(BITVEC bv)
{
int i;
char str[SIGLENBIT + 1];
str[SIGLENBIT] = '\0';
LOOPBIT(str[i] = (GETBIT(bv, i)) ? '1' : '0');
elog(NOTICE, "BV: %s", str);
}
#endif
/*
** types for functions
*/
typedef ArrayType *(*formarray) (ArrayType *, ArrayType *);
typedef void (*formfloat) (ArrayType *, float *);
/*
** usefull function
*/
static bool isort(int4 *a, const int len);
static ArrayType *new_intArrayType(int num);
static ArrayType *copy_intArrayType(ArrayType *a);
static ArrayType *resize_intArrayType(ArrayType *a, int num);
static int internal_size(int *a, int len);
static ArrayType *_int_unique(ArrayType *a);
/* common GiST function*/
static GIST_SPLITVEC *_int_common_picksplit(bytea *entryvec,
GIST_SPLITVEC *v,
formarray unionf,
formarray interf,
formfloat sizef,
float coef);
static float *_int_common_penalty(GISTENTRY *origentry,
GISTENTRY *newentry,
float *result,
formarray unionf,
formfloat sizef);
static ArrayType *_int_common_union(bytea *entryvec,
int *sizep,
formarray unionf);
/*
** GiST support methods
*/
PG_FUNCTION_INFO_V1( g_int_consistent );
PG_FUNCTION_INFO_V1( g_int_compress );
PG_FUNCTION_INFO_V1( g_int_decompress );
PG_FUNCTION_INFO_V1( g_int_penalty );
PG_FUNCTION_INFO_V1( g_int_picksplit );
PG_FUNCTION_INFO_V1( g_int_union );
PG_FUNCTION_INFO_V1( g_int_same );
Datum g_int_consistent(PG_FUNCTION_ARGS);
Datum g_int_compress(PG_FUNCTION_ARGS);
Datum g_int_decompress(PG_FUNCTION_ARGS);
Datum g_int_penalty(PG_FUNCTION_ARGS);
Datum g_int_picksplit(PG_FUNCTION_ARGS);
Datum g_int_union(PG_FUNCTION_ARGS);
Datum g_int_same(PG_FUNCTION_ARGS);
/*
** R-tree support functions
*/
static bool inner_int_contains(ArrayType *a, ArrayType *b);
static bool inner_int_overlap(ArrayType *a, ArrayType *b);
static ArrayType *inner_int_union(ArrayType *a, ArrayType *b);
static ArrayType *inner_int_inter(ArrayType *a, ArrayType *b);
static void rt__int_size(ArrayType *a, float *sz);
PG_FUNCTION_INFO_V1( _int_different );
PG_FUNCTION_INFO_V1( _int_same );
PG_FUNCTION_INFO_V1( _int_contains );
PG_FUNCTION_INFO_V1( _int_contained );
PG_FUNCTION_INFO_V1( _int_overlap );
PG_FUNCTION_INFO_V1( _int_union );
PG_FUNCTION_INFO_V1( _int_inter );
Datum _int_different(PG_FUNCTION_ARGS);
Datum _int_same(PG_FUNCTION_ARGS);
Datum _int_contains(PG_FUNCTION_ARGS);
Datum _int_contained(PG_FUNCTION_ARGS);
Datum _int_overlap(PG_FUNCTION_ARGS);
Datum _int_union(PG_FUNCTION_ARGS);
Datum _int_inter(PG_FUNCTION_ARGS);
/*
** _intbig methods
*/
PG_FUNCTION_INFO_V1( g_intbig_consistent );
PG_FUNCTION_INFO_V1( g_intbig_compress );
PG_FUNCTION_INFO_V1( g_intbig_decompress );
PG_FUNCTION_INFO_V1( g_intbig_penalty );
PG_FUNCTION_INFO_V1( g_intbig_picksplit );
PG_FUNCTION_INFO_V1( g_intbig_union );
PG_FUNCTION_INFO_V1( g_intbig_same );
Datum g_intbig_consistent(PG_FUNCTION_ARGS);
Datum g_intbig_compress(PG_FUNCTION_ARGS);
Datum g_intbig_decompress(PG_FUNCTION_ARGS);
Datum g_intbig_penalty(PG_FUNCTION_ARGS);
Datum g_intbig_picksplit(PG_FUNCTION_ARGS);
Datum g_intbig_union(PG_FUNCTION_ARGS);
Datum g_intbig_same(PG_FUNCTION_ARGS);
static bool _intbig_contains(ArrayType *a, ArrayType *b);
static bool _intbig_overlap(ArrayType *a, ArrayType *b);
static ArrayType *_intbig_union(ArrayType *a, ArrayType *b);
static ArrayType * _intbig_inter(ArrayType *a, ArrayType *b);
static void rt__intbig_size(ArrayType *a, float *sz);
/*****************************************************************************
* Boolean Search
*****************************************************************************/
#define BooleanSearchStrategy 20
/*
* item in polish notation with back link
* to left operand
*/
typedef struct ITEM {
int2 type;
int2 left;
int4 val;
} ITEM;
typedef struct {
int4 len;
int4 size;
char data[1];
} QUERYTYPE;
#define HDRSIZEQT ( 2*sizeof(int4) )
#define COMPUTESIZE(size) ( HDRSIZEQT + size * sizeof(ITEM) )
#define GETQUERY(x) (ITEM*)( (char*)(x)+HDRSIZEQT )
PG_FUNCTION_INFO_V1(bqarr_in);
PG_FUNCTION_INFO_V1(bqarr_out);
Datum bqarr_in(PG_FUNCTION_ARGS);
Datum bqarr_out(PG_FUNCTION_ARGS);
PG_FUNCTION_INFO_V1(boolop);
Datum boolop(PG_FUNCTION_ARGS);
PG_FUNCTION_INFO_V1(rboolop);
Datum rboolop(PG_FUNCTION_ARGS);
PG_FUNCTION_INFO_V1(querytree);
Datum querytree(PG_FUNCTION_ARGS);
static bool signconsistent( QUERYTYPE *query, BITVEC sign, bool leaf );
static bool execconsistent( QUERYTYPE *query, ArrayType *array, bool leaf );
/*****************************************************************************
* GiST functions
*****************************************************************************/
/*
** The GiST Consistent method for _intments
** Should return false if for all data items x below entry,
** the predicate x op query == FALSE, where op is the oper
** corresponding to strategy in the pg_amop table.
*/
Datum
g_int_consistent(PG_FUNCTION_ARGS) {
GISTENTRY *entry = (GISTENTRY *)PG_GETARG_POINTER(0);
ArrayType *query = ( ArrayType * )PG_GETARG_POINTER(1);
StrategyNumber strategy = (StrategyNumber) PG_GETARG_UINT16(2);
bool retval;
if ( strategy == BooleanSearchStrategy )
PG_RETURN_BOOL(execconsistent( (QUERYTYPE*)query,
(ArrayType *) DatumGetPointer(entry->key),
ISLEAFKEY( (ArrayType *) DatumGetPointer(entry->key) ) ) );
/* XXX are we sure it's safe to scribble on the query object here? */
/* XXX what about toasted input? */
/* sort query for fast search, key is already sorted */
if ( ARRISVOID( query ) )
PG_RETURN_BOOL(false);
PREPAREARR(query);
switch (strategy)
{
case RTOverlapStrategyNumber:
retval = inner_int_overlap((ArrayType *) DatumGetPointer(entry->key),
query);
break;
case RTSameStrategyNumber:
if ( GIST_LEAF(entry) )
DirectFunctionCall3(
g_int_same,
entry->key,
PointerGetDatum(query),
PointerGetDatum(&retval)
);
else
retval = inner_int_contains((ArrayType *) DatumGetPointer(entry->key),
query);
break;
case RTContainsStrategyNumber:
retval = inner_int_contains((ArrayType *) DatumGetPointer(entry->key),
query);
break;
case RTContainedByStrategyNumber:
if ( GIST_LEAF(entry) )
retval = inner_int_contains(query,
(ArrayType *) DatumGetPointer(entry->key) );
else
retval = inner_int_overlap((ArrayType *) DatumGetPointer(entry->key),
query);
break;
default:
retval = FALSE;
}
PG_RETURN_BOOL(retval);
}
Datum
g_int_union(PG_FUNCTION_ARGS)
{
PG_RETURN_POINTER( _int_common_union(
(bytea *) PG_GETARG_POINTER(0),
(int *) PG_GETARG_POINTER(1),
inner_int_union
) );
}
/*
** GiST Compress and Decompress methods
*/
Datum
g_int_compress(PG_FUNCTION_ARGS)
{
GISTENTRY *entry = (GISTENTRY *)PG_GETARG_POINTER(0);
GISTENTRY *retval;
ArrayType *r;
int len;
int *dr;
int i,
min,
cand;
if (entry->leafkey) {
r = (ArrayType *) PG_DETOAST_DATUM_COPY(entry->key);
PREPAREARR(r);
r->flags |= LEAFKEY;
retval = palloc(sizeof(GISTENTRY));
gistentryinit(*retval, PointerGetDatum(r),
entry->rel, entry->page, entry->offset, VARSIZE(r), FALSE);
PG_RETURN_POINTER(retval);
}
r = (ArrayType *) PG_DETOAST_DATUM(entry->key);
if ( ISLEAFKEY( r ) || ARRISVOID(r) ) {
if ( r != (ArrayType*)DatumGetPointer(entry->key) )
pfree(r);
PG_RETURN_POINTER(entry);
}
if ( (len=ARRNELEMS(r)) >= 2 * MAXNUMRANGE) { /* compress */
if ( r == (ArrayType*)DatumGetPointer( entry->key) )
r = (ArrayType *) PG_DETOAST_DATUM_COPY(entry->key);
r = resize_intArrayType(r, 2 * (len));
dr = ARRPTR(r);
for (i = len - 1; i >= 0; i--)
dr[2 * i] = dr[2 * i + 1] = dr[i];
len *= 2;
cand = 1;
while (len > MAXNUMRANGE * 2)
{
min = 0x7fffffff;
for (i = 2; i < len; i += 2)
if (min > (dr[i] - dr[i - 1]))
{
min = (dr[i] - dr[i - 1]);
cand = i;
}
memmove((void *) &dr[cand - 1], (void *) &dr[cand + 1], (len - cand - 1) * sizeof(int));
len -= 2;
}
r = resize_intArrayType(r, len);
retval = palloc(sizeof(GISTENTRY));
gistentryinit(*retval, PointerGetDatum(r),
entry->rel, entry->page, entry->offset, VARSIZE(r), FALSE);
PG_RETURN_POINTER(retval);
} else {
PG_RETURN_POINTER(entry);
}
PG_RETURN_POINTER(entry);
}
Datum
g_int_decompress(PG_FUNCTION_ARGS)
{
GISTENTRY *entry = (GISTENTRY *)PG_GETARG_POINTER(0);
GISTENTRY *retval;
ArrayType *r;
int *dr,
lenr;
ArrayType *in;
int lenin;
int *din;
int i,
j;
in = (ArrayType *) PG_DETOAST_DATUM(entry->key);
if ( ARRISVOID(in) ) {
PG_RETURN_POINTER(entry);
}
lenin = ARRNELEMS(in);
if (lenin < 2 * MAXNUMRANGE || ISLEAFKEY( in ) ) { /* not comressed value */
if ( in != (ArrayType *) DatumGetPointer(entry->key)) {
retval = palloc(sizeof(GISTENTRY));
gistentryinit(*retval, PointerGetDatum(in),
entry->rel, entry->page, entry->offset, VARSIZE(in), FALSE);
PG_RETURN_POINTER(retval);
}
PG_RETURN_POINTER(entry);
}
din = ARRPTR(in);
lenr = internal_size(din, lenin);
r = new_intArrayType(lenr);
dr = ARRPTR(r);
for (i = 0; i < lenin; i += 2)
for (j = din[i]; j <= din[i + 1]; j++)
if ((!i) || *(dr - 1) != j)
*dr++ = j;
if (in != (ArrayType *) DatumGetPointer(entry->key))
pfree(in);
retval = palloc(sizeof(GISTENTRY));
gistentryinit(*retval, PointerGetDatum(r),
entry->rel, entry->page, entry->offset, VARSIZE(r), FALSE);
PG_RETURN_POINTER(retval);
}
/*
** The GiST Penalty method for _intments
*/
Datum
g_int_penalty(PG_FUNCTION_ARGS)
{
PG_RETURN_POINTER( _int_common_penalty(
(GISTENTRY *)PG_GETARG_POINTER(0),
(GISTENTRY *)PG_GETARG_POINTER(1),
(float *) PG_GETARG_POINTER(2),
inner_int_union, rt__int_size
) );
}
Datum
g_int_picksplit(PG_FUNCTION_ARGS)
{
PG_RETURN_POINTER( _int_common_picksplit(
(bytea *)PG_GETARG_POINTER(0),
(GIST_SPLITVEC *)PG_GETARG_POINTER(1),
inner_int_union,
inner_int_inter,
rt__int_size,
0.01
) );
}
/*
** Equality methods
*/
Datum
g_int_same(PG_FUNCTION_ARGS)
{
ArrayType *a = (ArrayType*)PointerGetDatum(PG_GETARG_POINTER(0));
ArrayType *b = (ArrayType*)PointerGetDatum(PG_GETARG_POINTER(1));
bool *result = (bool *)PG_GETARG_POINTER(2);
int4 n = ARRNELEMS(a);
int4 *da, *db;
if ( n != ARRNELEMS(b) ) {
*result = false;
PG_RETURN_POINTER(result);
}
*result = TRUE;
da = ARRPTR(a);
db = ARRPTR(b);
while(n--)
if (*da++ != *db++) {
*result = FALSE;
break;
}
PG_RETURN_POINTER(result);
}
Datum
_int_contained(PG_FUNCTION_ARGS)
{
PG_RETURN_BOOL( DatumGetBool(
DirectFunctionCall2(
_int_contains,
PointerGetDatum(PG_GETARG_POINTER(1)),
PointerGetDatum(PG_GETARG_POINTER(0))
)
));
}
Datum
_int_contains(PG_FUNCTION_ARGS)
{
ArrayType *a = (ArrayType *)DatumGetPointer(PG_DETOAST_DATUM_COPY(PG_GETARG_DATUM(0)));
ArrayType *b = (ArrayType *)DatumGetPointer(PG_DETOAST_DATUM_COPY(PG_GETARG_DATUM(1)));
bool res;
if (ARRISVOID(a) || ARRISVOID(b))
return FALSE;
PREPAREARR(a);
PREPAREARR(b);
res = inner_int_contains(a, b);
pfree(a);
pfree(b);
PG_RETURN_BOOL( res );
}
static bool
inner_int_contains(ArrayType *a, ArrayType *b)
{
int na,
nb;
int i,
j,
n;
int *da,
*db;
if (ARRISVOID(a) || ARRISVOID(b))
return FALSE;
na = ARRNELEMS(a);
nb = ARRNELEMS(b);
da = ARRPTR(a);
db = ARRPTR(b);
#ifdef GIST_DEBUG
elog(NOTICE, "contains %d %d", na, nb);
#endif
i = j = n = 0;
while (i < na && j < nb)
if (da[i] < db[j])
i++;
else if (da[i] == db[j])
{
n++;
i++;
j++;
}
else
j++;
return (n == nb) ? TRUE : FALSE;
}
/*****************************************************************************
* Operator class for R-tree indexing
*****************************************************************************/
Datum
_int_different(PG_FUNCTION_ARGS)
{
PG_RETURN_BOOL( ! DatumGetBool(
DirectFunctionCall2(
_int_same,
PointerGetDatum(PG_GETARG_POINTER(0)),
PointerGetDatum(PG_GETARG_POINTER(1))
)
));
}
Datum
_int_same(PG_FUNCTION_ARGS)
{
ArrayType *a = (ArrayType *)DatumGetPointer(PG_DETOAST_DATUM_COPY(PG_GETARG_DATUM(0)));
ArrayType *b = (ArrayType *)DatumGetPointer(PG_DETOAST_DATUM_COPY(PG_GETARG_DATUM(1)));
int na,
nb;
int n;
int *da,
*db;
bool result;
bool avoid = ARRISVOID(a);
bool bvoid = ARRISVOID(b);
if (avoid || bvoid)
return (avoid && bvoid) ? TRUE : FALSE;
SORT(a);
SORT(b);
na = ARRNELEMS(a);
nb = ARRNELEMS(b);
da = ARRPTR(a);
db = ARRPTR(b);
result = FALSE;
if (na == nb)
{
result = TRUE;
for (n = 0; n < na; n++)
if (da[n] != db[n])
{
result = FALSE;
break;
}
}
pfree(a);
pfree(b);
PG_RETURN_BOOL(result);
}
/* _int_overlap -- does a overlap b?
*/
Datum
_int_overlap(PG_FUNCTION_ARGS)
{
ArrayType *a = (ArrayType *)DatumGetPointer(PG_DETOAST_DATUM_COPY(PG_GETARG_DATUM(0)));
ArrayType *b = (ArrayType *)DatumGetPointer(PG_DETOAST_DATUM_COPY(PG_GETARG_DATUM(1)));
bool result;
if (ARRISVOID(a) || ARRISVOID(b))
return FALSE;
SORT(a);
SORT(b);
result = inner_int_overlap(a, b);
pfree(a);
pfree(b);
PG_RETURN_BOOL( result );
}
static bool
inner_int_overlap(ArrayType *a, ArrayType *b)
{
int na,
nb;
int i,
j;
int *da,
*db;
if (ARRISVOID(a) || ARRISVOID(b))
return FALSE;
na = ARRNELEMS(a);
nb = ARRNELEMS(b);
da = ARRPTR(a);
db = ARRPTR(b);
#ifdef GIST_DEBUG
elog(NOTICE, "g_int_overlap");
#endif
i = j = 0;
while (i < na && j < nb)
if (da[i] < db[j])
i++;
else if (da[i] == db[j])
return TRUE;
else
j++;
return FALSE;
}
Datum
_int_union(PG_FUNCTION_ARGS)
{
ArrayType *a = (ArrayType *)DatumGetPointer(PG_DETOAST_DATUM_COPY(PG_GETARG_DATUM(0)));
ArrayType *b = (ArrayType *)DatumGetPointer(PG_DETOAST_DATUM_COPY(PG_GETARG_DATUM(1)));
ArrayType *result;
if (!ARRISVOID(a))
SORT(a);
if (!ARRISVOID(b))
SORT(b);
result = inner_int_union(a, b);
if (a)
pfree(a);
if (b)
pfree(b);
PG_RETURN_POINTER( result );
}
static ArrayType *
inner_int_union(ArrayType *a, ArrayType *b)
{
ArrayType *r = NULL;
int na,
nb;
int *da,
*db,
*dr;
int i,
j;
if (ARRISVOID(a) && ARRISVOID(b))
return new_intArrayType(0);
if (ARRISVOID(a))
r = copy_intArrayType(b);
if (ARRISVOID(b))
r = copy_intArrayType(a);
if (r)
dr = ARRPTR(r);
else
{
na = ARRNELEMS(a);
nb = ARRNELEMS(b);
da = ARRPTR(a);
db = ARRPTR(b);
r = new_intArrayType(na + nb);
dr = ARRPTR(r);
/* union */
i = j = 0;
while (i < na && j < nb)
if (da[i] < db[j])
*dr++ = da[i++];
else
*dr++ = db[j++];
while (i < na)
*dr++ = da[i++];
while (j < nb)
*dr++ = db[j++];
}
if (ARRNELEMS(r) > 1)
r = _int_unique(r);
return r;
}
Datum
_int_inter(PG_FUNCTION_ARGS)
{
ArrayType *a = (ArrayType *)DatumGetPointer(PG_DETOAST_DATUM_COPY(PG_GETARG_DATUM(0)));
ArrayType *b = (ArrayType *)DatumGetPointer(PG_DETOAST_DATUM_COPY(PG_GETARG_DATUM(1)));
ArrayType *result;
if (ARRISVOID(a) || ARRISVOID(b))
PG_RETURN_POINTER(new_intArrayType(0));
SORT(a);
SORT(b);
result = inner_int_inter(a, b);
pfree(a);
pfree(b);
PG_RETURN_POINTER( result );
}
static ArrayType *
inner_int_inter(ArrayType *a, ArrayType *b)
{
ArrayType *r;
int na,
nb;
int *da,
*db,
*dr;
int i,
j;
if (ARRISVOID(a) || ARRISVOID(b))
return new_intArrayType(0);
na = ARRNELEMS(a);
nb = ARRNELEMS(b);
da = ARRPTR(a);
db = ARRPTR(b);
r = new_intArrayType(min(na, nb));
dr = ARRPTR(r);
i = j = 0;
while (i < na && j < nb)
if (da[i] < db[j])
i++;
else if (da[i] == db[j])
{
if (i + j == 0 || (i + j > 0 && *(dr - 1) != db[j]))
*dr++ = db[j];
i++;
j++;
}
else
j++;
if ((dr - ARRPTR(r)) == 0)
{
pfree(r);
return new_intArrayType(0);
}
else
return resize_intArrayType(r, dr - ARRPTR(r));
}
static void
rt__int_size(ArrayType *a, float *size)
{
*size = (float) ARRNELEMS(a);
return;
}
/*****************************************************************************
* Miscellaneous operators and functions
*****************************************************************************/
/* len >= 2 */
static bool
isort(int4 *a, int len)
{
int4 tmp,
index;
int4 *cur,
*end;
bool r = FALSE;
end = a + len;
do
{
index = 0;
cur = a + 1;
while (cur < end)
{
if (*(cur - 1) > *cur)
{
tmp = *(cur - 1);
*(cur - 1) = *cur;
*cur = tmp;
index = 1;
}
else if (!r && *(cur - 1) == *cur)
r = TRUE;
cur++;
}
} while (index);
return r;
}
static ArrayType *
new_intArrayType(int num)
{
ArrayType *r;
int nbytes = ARR_OVERHEAD(NDIM) + sizeof(int) * num;
r = (ArrayType *) palloc(nbytes);
MemSet(r, 0, nbytes);
r->size = nbytes;
r->ndim = NDIM;
r->flags &= ~LEAFKEY;
*((int *) ARR_DIMS(r)) = num;
*((int *) ARR_LBOUND(r)) = 1;
return r;
}
static ArrayType *
resize_intArrayType(ArrayType *a, int num)
{
int nbytes = ARR_OVERHEAD(NDIM) + sizeof(int) * num;
if (num == ARRNELEMS(a))
return a;
a = (ArrayType *) repalloc(a, nbytes);
a->size = nbytes;
*((int *) ARR_DIMS(a)) = num;
return a;
}
static ArrayType *
copy_intArrayType(ArrayType *a)
{
ArrayType *r;
r = new_intArrayType(ARRNELEMS(a));
memmove(r, a, VARSIZE(a));
return r;
}
/* num for compressed key */
static int
internal_size(int *a, int len)
{
int i,
size = 0;
for (i = 0; i < len; i += 2)
if (!i || a[i] != a[i - 1]) /* do not count repeated range */
size += a[i + 1] - a[i] + 1;
return size;
}
/* r is sorted and size of r > 1 */
static ArrayType *
_int_unique(ArrayType *r)
{
int *tmp,
*dr,
*data;
int num = ARRNELEMS(r);
data = tmp = dr = ARRPTR(r);
while (tmp - data < num)
if (*tmp != *dr)
*(++dr) = *tmp++;
else
tmp++;
return resize_intArrayType(r, dr + 1 - ARRPTR(r));
}
/*********************************************************************
** intbig functions
*********************************************************************/
static void
gensign(BITVEC sign, int *a, int len)
{
int i;
/* we assume that the sign vector is previously zeroed */
for (i = 0; i < len; i++)
{
HASH(sign, *a);
a++;
}
}
static bool
_intbig_overlap(ArrayType *a, ArrayType *b)
{
int i;
BITVECP da,