printtup.c 11.1 KB
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461
/*-------------------------------------------------------------------------
 *
 * printtup.c
 *	  Routines to print out tuples to the destination (binary or non-binary
 *	  portals, frontend/interactive backend, etc.).
 *
 * Portions Copyright (c) 1996-2001, PostgreSQL Global Development Group
 * Portions Copyright (c) 1994, Regents of the University of California
 *
 *
 * IDENTIFICATION
 *	  $Header: /cvsroot/pgsql/src/backend/access/common/printtup.c,v 1.59 2001/03/22 06:16:06 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_internal(HeapTuple tuple, TupleDesc typeinfo, DestReceiver *self);
static void printtup_cleanup(DestReceiver *self);

/* ----------------------------------------------------------------
 *		printtup / debugtup support
 * ----------------------------------------------------------------
 */

/* ----------------
 *		getTypeOutputInfo -- get info needed for printing values of a type
 * ----------------
 */
bool
getTypeOutputInfo(Oid type, Oid *typOutput, Oid *typElem,
				  bool *typIsVarlena)
{
	HeapTuple	typeTuple;
	Form_pg_type pt;

	typeTuple = SearchSysCache(TYPEOID,
							   ObjectIdGetDatum(type),
							   0, 0, 0);
	if (!HeapTupleIsValid(typeTuple))
		elog(ERROR, "getTypeOutputInfo: Cache lookup of type %u failed", type);
	pt = (Form_pg_type) GETSTRUCT(typeTuple);

	*typOutput = pt->typoutput;
	*typElem = pt->typelem;
	*typIsVarlena = (!pt->typbyval) && (pt->typlen == -1);
	ReleaseSysCache(typeTuple);
	return OidIsValid(*typOutput);
}

/* ----------------
 *		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 */
	bool		typisvarlena;	/* is it varlena (ie possibly toastable)? */
	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(bool isBinary)
{
	DR_printtup *self = (DR_printtup *) palloc(sizeof(DR_printtup));

	self->pub.receiveTuple = isBinary ? printtup_internal : 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 (getTypeOutputInfo(typeinfo->attrs[i]->atttypid,
							  &thisState->typoutput, &thisState->typelem,
							  &thisState->typisvarlena))
			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			natts = tuple->t_data->t_natts;
	int			i,
				j,
				k;

	/* Set or update my derived attribute info, if needed */
	if (myState->attrinfo != typeinfo || myState->nattrs != natts)
		printtup_prepare_info(myState, typeinfo, 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 < 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 < natts; ++i)
	{
		PrinttupAttrInfo *thisState = myState->myinfo + i;
		Datum		origattr,
					attr;
		bool		isnull;
		char	   *outputstr;

		origattr = heap_getattr(tuple, i + 1, typeinfo, &isnull);
		if (isnull)
			continue;
		if (OidIsValid(thisState->typoutput))
		{

			/*
			 * If we have a toasted datum, forcibly detoast it here to
			 * avoid memory leakage inside the type's output routine.
			 */
			if (thisState->typisvarlena)
				attr = PointerGetDatum(PG_DETOAST_DATUM(origattr));
			else
				attr = origattr;

			outputstr = DatumGetCString(FunctionCall3(&thisState->finfo,
													  attr,
									ObjectIdGetDatum(thisState->typelem),
						  Int32GetDatum(typeinfo->attrs[i]->atttypmod)));

			pq_sendcountedtext(&buf, outputstr, strlen(outputstr));

			/* Clean up detoasted copy, if any */
			if (attr != origattr)
				pfree(DatumGetPointer(attr));
			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			natts = tuple->t_data->t_natts;
	int			i;
	Datum		origattr,
				attr;
	char	   *value;
	bool		isnull;
	Oid			typoutput,
				typelem;
	bool		typisvarlena;

	for (i = 0; i < natts; ++i)
	{
		origattr = heap_getattr(tuple, i + 1, typeinfo, &isnull);
		if (isnull)
			continue;
		if (getTypeOutputInfo(typeinfo->attrs[i]->atttypid,
							  &typoutput, &typelem, &typisvarlena))
		{

			/*
			 * If we have a toasted datum, forcibly detoast it here to
			 * avoid memory leakage inside the type's output routine.
			 */
			if (typisvarlena)
				attr = PointerGetDatum(PG_DETOAST_DATUM(origattr));
			else
				attr = origattr;

			value = DatumGetCString(OidFunctionCall3(typoutput,
													 attr,
											   ObjectIdGetDatum(typelem),
						  Int32GetDatum(typeinfo->attrs[i]->atttypmod)));

			printatt((unsigned) i + 1, typeinfo->attrs[i], value);

			/* Clean up detoasted copy, if any */
			if (attr != origattr)
				pfree(DatumGetPointer(attr));
			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 largely same as printtup, except we don't use the typout func.
 * ----------------
 */
static void
printtup_internal(HeapTuple tuple, TupleDesc typeinfo, DestReceiver *self)
{
	DR_printtup *myState = (DR_printtup *) self;
	StringInfoData buf;
	int			natts = tuple->t_data->t_natts;
	int			i,
				j,
				k;

	/* Set or update my derived attribute info, if needed */
	if (myState->attrinfo != typeinfo || myState->nattrs != natts)
		printtup_prepare_info(myState, typeinfo, natts);

	/*
	 * 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 < 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", natts);
#endif

	for (i = 0; i < natts; ++i)
	{
		PrinttupAttrInfo *thisState = myState->myinfo + i;
		Datum		origattr,
					attr;
		bool		isnull;
		int32		len;

		origattr = heap_getattr(tuple, i + 1, typeinfo, &isnull);
		if (isnull)
			continue;
		/* send # of bytes, and opaque data */
		if (thisState->typisvarlena)
		{

			/*
			 * If we have a toasted datum, must detoast before sending.
			 */
			attr = PointerGetDatum(PG_DETOAST_DATUM(origattr));

			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

			/* Clean up detoasted copy, if any */
			if (attr != origattr)
				pfree(DatumGetPointer(attr));
		}
		else
		{
			/* fixed size */
			attr = origattr;
			len = typeinfo->attrs[i]->attlen;
			pq_sendint(&buf, len, sizeof(int32));
			if (typeinfo->attrs[i]->attbyval)
			{
				Datum		datumBuf;

				/*
				 * We need this horsing around because we don't know how
				 * shorter data values are aligned within a Datum.
				 */
				store_att_byval(&datumBuf, attr, len);
				pq_sendbytes(&buf, (char *) &datumBuf, len);
#ifdef IPORTAL_DEBUG
				fprintf(stderr, "byval length %d data %ld\n", len,
						(long) attr);
#endif
			}
			else
			{
				pq_sendbytes(&buf, DatumGetPointer(attr), len);
#ifdef IPORTAL_DEBUG
				fprintf(stderr, "byref length %d data %p\n", len,
						DatumGetPointer(attr));
#endif
			}
		}
	}

	pq_endmessage(&buf);
}