GISTENTRY *
gbt_num_compress(GISTENTRY *retval, GISTENTRY *entry, const gbtree_ninfo *tinfo)
{
if (entry->leafkey)
{
union
{
int16 i2;
int32 i4;
int64 i8;
float4 f4;
float8 f8;
DateADT dt;
TimeADT tm;
Timestamp ts;
Cash ch;
} v;
GBT_NUMKEY *r = (GBT_NUMKEY *) palloc0(2 * tinfo->size);
void *leaf = NULL;
switch (tinfo->t)
{
case gbt_t_int2:
v.i2 = DatumGetInt16(entry->key);
leaf = &v.i2;
break;
case gbt_t_int4:
v.i4 = DatumGetInt32(entry->key);
leaf = &v.i4;
break;
case gbt_t_int8:
v.i8 = DatumGetInt64(entry->key);
leaf = &v.i8;
break;
case gbt_t_oid:
v.i4 = DatumGetObjectId(entry->key);
leaf = &v.i4;
break;
case gbt_t_float4:
v.f4 = DatumGetFloat4(entry->key);
leaf = &v.f4;
break;
case gbt_t_float8:
v.f8 = DatumGetFloat8(entry->key);
leaf = &v.f8;
break;
case gbt_t_date:
v.dt = DatumGetDateADT(entry->key);
leaf = &v.dt;
break;
case gbt_t_time:
v.tm = DatumGetTimeADT(entry->key);
leaf = &v.tm;
break;
case gbt_t_ts:
v.ts = DatumGetTimestamp(entry->key);
leaf = &v.ts;
break;
case gbt_t_cash:
v.ch = DatumGetCash(entry->key);
leaf = &v.ch;
break;
default:
leaf = DatumGetPointer(entry->key);
}
memcpy((void *) &r[0], leaf, tinfo->size);
memcpy((void *) &r[tinfo->size], leaf, tinfo->size);
retval = palloc(sizeof(GISTENTRY));
gistentryinit(*retval, PointerGetDatum(r), entry->rel, entry->page,
entry->offset, FALSE);
}
else
retval = entry;
return retval;
}
/*
* Add an attribute to the hash calculation.
* **IMPORTANT: any new hard coded support for a data type in here
* must be added to isGreenplumDbHashable() below!
*
* Note that the caller should provide the base type if the datum is
* of a domain type. It is quite expensive to call get_typtype() and
* getBaseType() here since this function gets called a lot for the
* same set of Datums.
*
* @param hashFn called to update the hash value.
* @param clientData passed to hashFn.
*/
void
hashDatum(Datum datum, Oid type, datumHashFunction hashFn, void *clientData)
{
void *buf = NULL; /* pointer to the data */
size_t len = 0; /* length for the data buffer */
int64 intbuf; /* an 8 byte buffer for all integer sizes */
float4 buf_f4;
float8 buf_f8;
Timestamp tsbuf; /* timestamp data dype is either a double or
* int8 (determined in compile time) */
TimestampTz tstzbuf;
DateADT datebuf;
TimeADT timebuf;
TimeTzADT *timetzptr;
Interval *intervalptr;
AbsoluteTime abstime_buf;
RelativeTime reltime_buf;
TimeInterval tinterval;
AbsoluteTime tinterval_len;
Numeric num;
bool bool_buf;
char char_buf;
Name namebuf;
ArrayType *arrbuf;
inet *inetptr; /* inet/cidr */
unsigned char inet_hkey[sizeof(inet_struct)];
macaddr *macptr; /* MAC address */
VarBit *vbitptr;
int2vector *i2vec_buf;
oidvector *oidvec_buf;
Cash cash_buf;
AclItem *aclitem_ptr;
uint32 aclitem_buf;
/*
* special case buffers
*/
uint32 nanbuf;
uint32 invalidbuf;
void *tofree = NULL;
/*
* Select the hash to be performed according to the field type we are adding to the
* hash.
*/
switch (type)
{
/*
* ======= NUMERIC TYPES ========
*/
case INT2OID: /* -32 thousand to 32 thousand, 2-byte storage */
intbuf = (int64) DatumGetInt16(datum); /* cast to 8 byte before
* hashing */
buf = &intbuf;
len = sizeof(intbuf);
break;
case INT4OID: /* -2 billion to 2 billion integer, 4-byte
* storage */
intbuf = (int64) DatumGetInt32(datum); /* cast to 8 byte before
* hashing */
buf = &intbuf;
len = sizeof(intbuf);
break;
case INT8OID: /* ~18 digit integer, 8-byte storage */
intbuf = DatumGetInt64(datum); /* cast to 8 byte before
* hashing */
buf = &intbuf;
len = sizeof(intbuf);
break;
case FLOAT4OID: /* single-precision floating point number,
* 4-byte storage */
buf_f4 = DatumGetFloat4(datum);
/*
* On IEEE-float machines, minus zero and zero have different bit
* patterns but should compare as equal. We must ensure that they
* have the same hash value, which is most easily done this way:
*/
if (buf_f4 == (float4) 0)
buf_f4 = 0.0;
buf = &buf_f4;
len = sizeof(buf_f4);
break;
case FLOAT8OID: /* double-precision floating point number,
* 8-byte storage */
buf_f8 = DatumGetFloat8(datum);
/*
* On IEEE-float machines, minus zero and zero have different bit
* patterns but should compare as equal. We must ensure that they
* have the same hash value, which is most easily done this way:
*/
if (buf_f8 == (float8) 0)
buf_f8 = 0.0;
buf = &buf_f8;
len = sizeof(buf_f8);
break;
case NUMERICOID:
num = DatumGetNumeric(datum);
if (NUMERIC_IS_NAN(num))
{
nanbuf = NAN_VAL;
buf = &nanbuf;
len = sizeof(nanbuf);
}
else
/* not a nan */
{
buf = num->n_data;
len = (VARSIZE(num) - NUMERIC_HDRSZ);
}
/*
* If we did a pg_detoast_datum, we need to remember to pfree,
* or we will leak memory. Because of the 1-byte varlena header stuff.
*/
if (num != DatumGetPointer(datum))
tofree = num;
break;
/*
* ====== CHARACTER TYPES =======
*/
case CHAROID: /* char(1), single character */
char_buf = DatumGetChar(datum);
buf = &char_buf;
len = 1;
break;
case BPCHAROID: /* char(n), blank-padded string, fixed storage */
case TEXTOID: /* text */
case VARCHAROID: /* varchar */
case BYTEAOID: /* bytea */
{
int tmplen;
varattrib_untoast_ptr_len(datum, (char **) &buf, &tmplen, &tofree);
/* adjust length to not include trailing blanks */
if (type != BYTEAOID && tmplen > 1)
tmplen = ignoreblanks((char *) buf, tmplen);
len = tmplen;
break;
}
case NAMEOID:
namebuf = DatumGetName(datum);
len = NAMEDATALEN;
buf = NameStr(*namebuf);
/* adjust length to not include trailing blanks */
if (len > 1)
len = ignoreblanks((char *) buf, len);
break;
/*
* ====== OBJECT IDENTIFIER TYPES ======
*/
case OIDOID: /* object identifier(oid), maximum 4 billion */
case REGPROCOID: /* function name */
case REGPROCEDUREOID: /* function name with argument types */
case REGOPEROID: /* operator name */
case REGOPERATOROID: /* operator with argument types */
case REGCLASSOID: /* relation name */
case REGTYPEOID: /* data type name */
intbuf = (int64) DatumGetUInt32(datum); /* cast to 8 byte before hashing */
buf = &intbuf;
len = sizeof(intbuf);
break;
case TIDOID: /* tuple id (6 bytes) */
buf = DatumGetPointer(datum);
len = SizeOfIptrData;
break;
/*
* ====== DATE/TIME TYPES ======
*/
case TIMESTAMPOID: /* date and time */
tsbuf = DatumGetTimestamp(datum);
buf = &tsbuf;
len = sizeof(tsbuf);
break;
case TIMESTAMPTZOID: /* date and time with time zone */
tstzbuf = DatumGetTimestampTz(datum);
buf = &tstzbuf;
len = sizeof(tstzbuf);
break;
case DATEOID: /* ANSI SQL date */
datebuf = DatumGetDateADT(datum);
buf = &datebuf;
len = sizeof(datebuf);
break;
case TIMEOID: /* hh:mm:ss, ANSI SQL time */
timebuf = DatumGetTimeADT(datum);
buf = &timebuf;
len = sizeof(timebuf);
break;
case TIMETZOID: /* time with time zone */
/*
* will not compare to TIMEOID on equal values.
* Postgres never attempts to compare the two as well.
*/
timetzptr = DatumGetTimeTzADTP(datum);
buf = (unsigned char *) timetzptr;
/*
* Specify hash length as sizeof(double) + sizeof(int4), not as
* sizeof(TimeTzADT), so that any garbage pad bytes in the structure
* won't be included in the hash!
*/
len = sizeof(timetzptr->time) + sizeof(timetzptr->zone);
break;
case INTERVALOID: /* @ <number> <units>, time interval */
intervalptr = DatumGetIntervalP(datum);
buf = (unsigned char *) intervalptr;
/*
* Specify hash length as sizeof(double) + sizeof(int4), not as
* sizeof(Interval), so that any garbage pad bytes in the structure
* won't be included in the hash!
*/
len = sizeof(intervalptr->time) + sizeof(intervalptr->month);
break;
case ABSTIMEOID:
abstime_buf = DatumGetAbsoluteTime(datum);
if (abstime_buf == INVALID_ABSTIME)
{
/* hash to a constant value */
invalidbuf = INVALID_VAL;
len = sizeof(invalidbuf);
buf = &invalidbuf;
}
else
{
len = sizeof(abstime_buf);
buf = &abstime_buf;
}
break;
case RELTIMEOID:
reltime_buf = DatumGetRelativeTime(datum);
if (reltime_buf == INVALID_RELTIME)
{
/* hash to a constant value */
invalidbuf = INVALID_VAL;
len = sizeof(invalidbuf);
buf = &invalidbuf;
}
else
{
len = sizeof(reltime_buf);
buf = &reltime_buf;
}
break;
case TINTERVALOID:
tinterval = DatumGetTimeInterval(datum);
/*
* check if a valid interval. the '0' status code
* stands for T_INTERVAL_INVAL which is defined in
* nabstime.c. We use the actual value instead
* of defining it again here.
*/
if(tinterval->status == 0 ||
tinterval->data[0] == INVALID_ABSTIME ||
tinterval->data[1] == INVALID_ABSTIME)
{
/* hash to a constant value */
invalidbuf = INVALID_VAL;
len = sizeof(invalidbuf);
buf = &invalidbuf;
}
else
{
/* normalize on length of the time interval */
tinterval_len = tinterval->data[1] - tinterval->data[0];
len = sizeof(tinterval_len);
buf = &tinterval_len;
}
break;
/*
* ======= NETWORK TYPES ========
*/
case INETOID:
case CIDROID:
inetptr = DatumGetInetP(datum);
len = inet_getkey(inetptr, inet_hkey, sizeof(inet_hkey)); /* fill-in inet_key & get len */
buf = inet_hkey;
break;
case MACADDROID:
macptr = DatumGetMacaddrP(datum);
len = sizeof(macaddr);
buf = (unsigned char *) macptr;
break;
/*
* ======== BIT STRINGS ========
*/
case BITOID:
case VARBITOID:
/*
* Note that these are essentially strings.
* we don't need to worry about '10' and '010'
* to compare, b/c they will not, by design.
* (see SQL standard, and varbit.c)
*/
vbitptr = DatumGetVarBitP(datum);
len = VARBITBYTES(vbitptr);
buf = (char *) VARBITS(vbitptr);
break;
/*
* ======= other types =======
*/
case BOOLOID: /* boolean, 'true'/'false' */
bool_buf = DatumGetBool(datum);
buf = &bool_buf;
len = sizeof(bool_buf);
break;
/*
* We prepare the hash key for aclitems just like postgresql does.
* (see code and comment in acl.c: hash_aclitem() ).
*/
case ACLITEMOID:
aclitem_ptr = DatumGetAclItemP(datum);
aclitem_buf = (uint32) (aclitem_ptr->ai_privs + aclitem_ptr->ai_grantee + aclitem_ptr->ai_grantor);
buf = &aclitem_buf;
len = sizeof(aclitem_buf);
break;
/*
* ANYARRAY is a pseudo-type. We use it to include
* any of the array types (OIDs 1007-1033 in pg_type.h).
* caller needs to be sure the type is ANYARRAYOID
* before calling cdbhash on an array (INSERT and COPY do so).
*/
case ANYARRAYOID:
arrbuf = DatumGetArrayTypeP(datum);
len = VARSIZE(arrbuf) - VARHDRSZ;
buf = VARDATA(arrbuf);
break;
case INT2VECTOROID:
i2vec_buf = (int2vector *) DatumGetPointer(datum);
len = i2vec_buf->dim1 * sizeof(int2);
buf = (void *)i2vec_buf->values;
break;
case OIDVECTOROID:
oidvec_buf = (oidvector *) DatumGetPointer(datum);
len = oidvec_buf->dim1 * sizeof(Oid);
buf = oidvec_buf->values;
break;
case CASHOID: /* cash is stored in int32 internally */
cash_buf = (* (Cash *)DatumGetPointer(datum));
len = sizeof(Cash);
buf = &cash_buf;
break;
default:
ereport(ERROR,
(errcode(ERRCODE_CDB_FEATURE_NOT_YET),
errmsg("Type %u is not hashable.", type)));
} /* switch(type) */
/* do the hash using the selected algorithm */
hashFn(clientData, buf, len);
if(tofree)
pfree(tofree);
}