mirror of
https://git.postgresql.org/git/postgresql.git
synced 2024-09-04 03:37:19 +02:00
Make all system indexes unique. Make all cache loads use system indexes. Rename *rel to *relid in inheritance tables. Rename cache names to be clearer.
429 lines
10 KiB
C
429 lines
10 KiB
C
/*-------------------------------------------------------------------------
|
|
*
|
|
* printtup.c
|
|
* Routines to print out tuples to the destination (binary or non-binary
|
|
* portals, frontend/interactive backend, etc.).
|
|
*
|
|
* Copyright (c) 1994, Regents of the University of California
|
|
*
|
|
*
|
|
* IDENTIFICATION
|
|
* $Header: /cvsroot/pgsql/src/backend/access/common/printtup.c,v 1.51 1999/11/22 17:55:52 momjian Exp $
|
|
*
|
|
*-------------------------------------------------------------------------
|
|
*/
|
|
|
|
|
|
#include "postgres.h"
|
|
|
|
#include "access/heapam.h"
|
|
#include "access/printtup.h"
|
|
#include "catalog/pg_type.h"
|
|
#include "libpq/pqformat.h"
|
|
#include "utils/syscache.h"
|
|
|
|
static void printtup_setup(DestReceiver *self, TupleDesc typeinfo);
|
|
static void printtup(HeapTuple tuple, TupleDesc typeinfo, DestReceiver *self);
|
|
static void printtup_cleanup(DestReceiver *self);
|
|
|
|
/* ----------------------------------------------------------------
|
|
* printtup / debugtup support
|
|
* ----------------------------------------------------------------
|
|
*/
|
|
|
|
/* ----------------
|
|
* getTypeOutAndElem -- get both typoutput and typelem for a type
|
|
*
|
|
* We used to fetch these with two separate function calls,
|
|
* typtoout() and gettypelem(), which each called SearchSysCacheTuple.
|
|
* This way takes half the time.
|
|
* ----------------
|
|
*/
|
|
int
|
|
getTypeOutAndElem(Oid type, Oid *typOutput, Oid *typElem)
|
|
{
|
|
HeapTuple typeTuple;
|
|
|
|
typeTuple = SearchSysCacheTuple(TYPEOID,
|
|
ObjectIdGetDatum(type),
|
|
0, 0, 0);
|
|
|
|
if (HeapTupleIsValid(typeTuple))
|
|
{
|
|
Form_pg_type pt = (Form_pg_type) GETSTRUCT(typeTuple);
|
|
|
|
*typOutput = (Oid) pt->typoutput;
|
|
*typElem = (Oid) pt->typelem;
|
|
return OidIsValid(*typOutput);
|
|
}
|
|
|
|
elog(ERROR, "getTypeOutAndElem: Cache lookup of type %u failed", type);
|
|
|
|
*typOutput = InvalidOid;
|
|
*typElem = InvalidOid;
|
|
return 0;
|
|
}
|
|
|
|
/* ----------------
|
|
* Private state for a printtup destination object
|
|
* ----------------
|
|
*/
|
|
typedef struct
|
|
{ /* Per-attribute information */
|
|
Oid typoutput; /* Oid for the attribute's type output fn */
|
|
Oid typelem; /* typelem value to pass to the output fn */
|
|
FmgrInfo finfo; /* Precomputed call info for typoutput */
|
|
} PrinttupAttrInfo;
|
|
|
|
typedef struct
|
|
{
|
|
DestReceiver pub; /* publicly-known function pointers */
|
|
TupleDesc attrinfo; /* The attr info we are set up for */
|
|
int nattrs;
|
|
PrinttupAttrInfo *myinfo; /* Cached info about each attr */
|
|
} DR_printtup;
|
|
|
|
/* ----------------
|
|
* Initialize: create a DestReceiver for printtup
|
|
* ----------------
|
|
*/
|
|
DestReceiver *
|
|
printtup_create_DR()
|
|
{
|
|
DR_printtup *self = (DR_printtup *) palloc(sizeof(DR_printtup));
|
|
|
|
self->pub.receiveTuple = printtup;
|
|
self->pub.setup = printtup_setup;
|
|
self->pub.cleanup = printtup_cleanup;
|
|
|
|
self->attrinfo = NULL;
|
|
self->nattrs = 0;
|
|
self->myinfo = NULL;
|
|
|
|
return (DestReceiver *) self;
|
|
}
|
|
|
|
static void
|
|
printtup_setup(DestReceiver *self, TupleDesc typeinfo)
|
|
{
|
|
/* ----------------
|
|
* We could set up the derived attr info at this time, but we postpone it
|
|
* until the first call of printtup, for 3 reasons:
|
|
* 1. We don't waste time (compared to the old way) if there are no
|
|
* tuples at all to output.
|
|
* 2. Checking in printtup allows us to handle the case that the tuples
|
|
* change type midway through (although this probably can't happen in
|
|
* the current executor).
|
|
* 3. Right now, ExecutorRun passes a NULL for typeinfo anyway :-(
|
|
* ----------------
|
|
*/
|
|
}
|
|
|
|
static void
|
|
printtup_prepare_info(DR_printtup *myState, TupleDesc typeinfo, int numAttrs)
|
|
{
|
|
int i;
|
|
|
|
if (myState->myinfo)
|
|
pfree(myState->myinfo); /* get rid of any old data */
|
|
myState->myinfo = NULL;
|
|
myState->attrinfo = typeinfo;
|
|
myState->nattrs = numAttrs;
|
|
if (numAttrs <= 0)
|
|
return;
|
|
myState->myinfo = (PrinttupAttrInfo *)
|
|
palloc(numAttrs * sizeof(PrinttupAttrInfo));
|
|
for (i = 0; i < numAttrs; i++)
|
|
{
|
|
PrinttupAttrInfo *thisState = myState->myinfo + i;
|
|
|
|
if (getTypeOutAndElem((Oid) typeinfo->attrs[i]->atttypid,
|
|
&thisState->typoutput, &thisState->typelem))
|
|
fmgr_info(thisState->typoutput, &thisState->finfo);
|
|
}
|
|
}
|
|
|
|
/* ----------------
|
|
* printtup
|
|
* ----------------
|
|
*/
|
|
static void
|
|
printtup(HeapTuple tuple, TupleDesc typeinfo, DestReceiver *self)
|
|
{
|
|
DR_printtup *myState = (DR_printtup *) self;
|
|
StringInfoData buf;
|
|
int i,
|
|
j,
|
|
k;
|
|
char *outputstr;
|
|
Datum attr;
|
|
bool isnull;
|
|
|
|
/* Set or update my derived attribute info, if needed */
|
|
if (myState->attrinfo != typeinfo ||
|
|
myState->nattrs != tuple->t_data->t_natts)
|
|
printtup_prepare_info(myState, typeinfo, tuple->t_data->t_natts);
|
|
|
|
/* ----------------
|
|
* tell the frontend to expect new tuple data (in ASCII style)
|
|
* ----------------
|
|
*/
|
|
pq_beginmessage(&buf);
|
|
pq_sendbyte(&buf, 'D');
|
|
|
|
/* ----------------
|
|
* send a bitmap of which attributes are not null
|
|
* ----------------
|
|
*/
|
|
j = 0;
|
|
k = 1 << 7;
|
|
for (i = 0; i < tuple->t_data->t_natts; ++i)
|
|
{
|
|
if (!heap_attisnull(tuple, i + 1))
|
|
j |= k; /* set bit if not null */
|
|
k >>= 1;
|
|
if (k == 0) /* end of byte? */
|
|
{
|
|
pq_sendint(&buf, j, 1);
|
|
j = 0;
|
|
k = 1 << 7;
|
|
}
|
|
}
|
|
if (k != (1 << 7)) /* flush last partial byte */
|
|
pq_sendint(&buf, j, 1);
|
|
|
|
/* ----------------
|
|
* send the attributes of this tuple
|
|
* ----------------
|
|
*/
|
|
for (i = 0; i < tuple->t_data->t_natts; ++i)
|
|
{
|
|
PrinttupAttrInfo *thisState = myState->myinfo + i;
|
|
|
|
attr = heap_getattr(tuple, i + 1, typeinfo, &isnull);
|
|
if (isnull)
|
|
continue;
|
|
if (OidIsValid(thisState->typoutput))
|
|
{
|
|
outputstr = (char *) (*fmgr_faddr(&thisState->finfo))
|
|
(attr, thisState->typelem, typeinfo->attrs[i]->atttypmod);
|
|
pq_sendcountedtext(&buf, outputstr, strlen(outputstr));
|
|
pfree(outputstr);
|
|
}
|
|
else
|
|
{
|
|
outputstr = "<unprintable>";
|
|
pq_sendcountedtext(&buf, outputstr, strlen(outputstr));
|
|
}
|
|
}
|
|
|
|
pq_endmessage(&buf);
|
|
}
|
|
|
|
/* ----------------
|
|
* printtup_cleanup
|
|
* ----------------
|
|
*/
|
|
static void
|
|
printtup_cleanup(DestReceiver *self)
|
|
{
|
|
DR_printtup *myState = (DR_printtup *) self;
|
|
|
|
if (myState->myinfo)
|
|
pfree(myState->myinfo);
|
|
pfree(myState);
|
|
}
|
|
|
|
/* ----------------
|
|
* printatt
|
|
* ----------------
|
|
*/
|
|
static void
|
|
printatt(unsigned attributeId,
|
|
Form_pg_attribute attributeP,
|
|
char *value)
|
|
{
|
|
printf("\t%2d: %s%s%s%s\t(typeid = %u, len = %d, typmod = %d, byval = %c)\n",
|
|
attributeId,
|
|
NameStr(attributeP->attname),
|
|
value != NULL ? " = \"" : "",
|
|
value != NULL ? value : "",
|
|
value != NULL ? "\"" : "",
|
|
(unsigned int) (attributeP->atttypid),
|
|
attributeP->attlen,
|
|
attributeP->atttypmod,
|
|
attributeP->attbyval ? 't' : 'f');
|
|
}
|
|
|
|
/* ----------------
|
|
* showatts
|
|
* ----------------
|
|
*/
|
|
void
|
|
showatts(char *name, TupleDesc tupleDesc)
|
|
{
|
|
int i;
|
|
int natts = tupleDesc->natts;
|
|
Form_pg_attribute *attinfo = tupleDesc->attrs;
|
|
|
|
puts(name);
|
|
for (i = 0; i < natts; ++i)
|
|
printatt((unsigned) i + 1, attinfo[i], (char *) NULL);
|
|
printf("\t----\n");
|
|
}
|
|
|
|
/* ----------------
|
|
* debugtup
|
|
* ----------------
|
|
*/
|
|
void
|
|
debugtup(HeapTuple tuple, TupleDesc typeinfo, DestReceiver *self)
|
|
{
|
|
int i;
|
|
Datum attr;
|
|
char *value;
|
|
bool isnull;
|
|
Oid typoutput,
|
|
typelem;
|
|
|
|
for (i = 0; i < tuple->t_data->t_natts; ++i)
|
|
{
|
|
attr = heap_getattr(tuple, i + 1, typeinfo, &isnull);
|
|
if (isnull)
|
|
continue;
|
|
if (getTypeOutAndElem((Oid) typeinfo->attrs[i]->atttypid,
|
|
&typoutput, &typelem))
|
|
{
|
|
value = fmgr(typoutput, attr, typelem,
|
|
typeinfo->attrs[i]->atttypmod);
|
|
printatt((unsigned) i + 1, typeinfo->attrs[i], value);
|
|
pfree(value);
|
|
}
|
|
}
|
|
printf("\t----\n");
|
|
}
|
|
|
|
/* ----------------
|
|
* printtup_internal
|
|
* We use a different data prefix, e.g. 'B' instead of 'D' to
|
|
* indicate a tuple in internal (binary) form.
|
|
*
|
|
* This is same as printtup, except we don't use the typout func,
|
|
* and therefore have no need for persistent state.
|
|
* ----------------
|
|
*/
|
|
void
|
|
printtup_internal(HeapTuple tuple, TupleDesc typeinfo, DestReceiver *self)
|
|
{
|
|
StringInfoData buf;
|
|
int i,
|
|
j,
|
|
k;
|
|
Datum attr;
|
|
bool isnull;
|
|
|
|
/* ----------------
|
|
* tell the frontend to expect new tuple data (in binary style)
|
|
* ----------------
|
|
*/
|
|
pq_beginmessage(&buf);
|
|
pq_sendbyte(&buf, 'B');
|
|
|
|
/* ----------------
|
|
* send a bitmap of which attributes are not null
|
|
* ----------------
|
|
*/
|
|
j = 0;
|
|
k = 1 << 7;
|
|
for (i = 0; i < tuple->t_data->t_natts; ++i)
|
|
{
|
|
if (!heap_attisnull(tuple, i + 1))
|
|
j |= k; /* set bit if not null */
|
|
k >>= 1;
|
|
if (k == 0) /* end of byte? */
|
|
{
|
|
pq_sendint(&buf, j, 1);
|
|
j = 0;
|
|
k = 1 << 7;
|
|
}
|
|
}
|
|
if (k != (1 << 7)) /* flush last partial byte */
|
|
pq_sendint(&buf, j, 1);
|
|
|
|
/* ----------------
|
|
* send the attributes of this tuple
|
|
* ----------------
|
|
*/
|
|
#ifdef IPORTAL_DEBUG
|
|
fprintf(stderr, "sending tuple with %d atts\n", tuple->t_data->t_natts);
|
|
#endif
|
|
for (i = 0; i < tuple->t_data->t_natts; ++i)
|
|
{
|
|
int32 len = typeinfo->attrs[i]->attlen;
|
|
|
|
attr = heap_getattr(tuple, i + 1, typeinfo, &isnull);
|
|
if (!isnull)
|
|
{
|
|
/* # of bytes, and opaque data */
|
|
if (len == -1)
|
|
{
|
|
/* variable length, assume a varlena structure */
|
|
len = VARSIZE(attr) - VARHDRSZ;
|
|
|
|
pq_sendint(&buf, len, VARHDRSZ);
|
|
pq_sendbytes(&buf, VARDATA(attr), len);
|
|
|
|
#ifdef IPORTAL_DEBUG
|
|
{
|
|
char *d = VARDATA(attr);
|
|
|
|
fprintf(stderr, "length %d data %x%x%x%x\n",
|
|
len, *d, *(d + 1), *(d + 2), *(d + 3));
|
|
}
|
|
#endif
|
|
}
|
|
else
|
|
{
|
|
/* fixed size */
|
|
if (typeinfo->attrs[i]->attbyval)
|
|
{
|
|
int8 i8;
|
|
int16 i16;
|
|
int32 i32;
|
|
|
|
pq_sendint(&buf, len, sizeof(int32));
|
|
switch (len)
|
|
{
|
|
case sizeof(int8):
|
|
i8 = DatumGetChar(attr);
|
|
pq_sendbytes(&buf, (char *) &i8, len);
|
|
break;
|
|
case sizeof(int16):
|
|
i16 = DatumGetInt16(attr);
|
|
pq_sendbytes(&buf, (char *) &i16, len);
|
|
break;
|
|
case sizeof(int32):
|
|
i32 = DatumGetInt32(attr);
|
|
pq_sendbytes(&buf, (char *) &i32, len);
|
|
break;
|
|
}
|
|
#ifdef IPORTAL_DEBUG
|
|
fprintf(stderr, "byval length %d data %d\n", len, attr);
|
|
#endif
|
|
}
|
|
else
|
|
{
|
|
pq_sendint(&buf, len, sizeof(int32));
|
|
pq_sendbytes(&buf, DatumGetPointer(attr), len);
|
|
#ifdef IPORTAL_DEBUG
|
|
fprintf(stderr, "byref length %d data %x\n", len,
|
|
DatumGetPointer(attr));
|
|
#endif
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
pq_endmessage(&buf);
|
|
}
|