1 /*-------------------------------------------------------------------------
4 * Primary include file for PostgreSQL server .c files
6 * This should be the first file included by PostgreSQL backend modules.
7 * Client-side code should include postgres_fe.h instead.
10 * Portions Copyright (c) 1996-2019, PostgreSQL Global Development Group
11 * Portions Copyright (c) 1995, Regents of the University of California
13 * src/include/postgres.h
15 *-------------------------------------------------------------------------
18 *----------------------------------------------------------------
21 * When adding stuff to this file, please try to put stuff
22 * into the relevant section, or add new sections as appropriate.
25 * ------- ------------------------------------------------
26 * 1) variable-length datatypes (TOAST support)
27 * 2) Datum type + support macros
31 * In general, this file should contain declarations that are widely needed
32 * in the backend environment, but are of no interest outside the backend.
34 * Simple type definitions live in c.h, where they are shared with
35 * postgres_fe.h. We do that since those type definitions are needed by
36 * frontend modules that want to deal with binary data transmission to or
37 * from the backend. Type definitions in this file should be for
38 * representations that never escape the backend, such as Datum or
39 * TOASTed varlena objects.
41 *----------------------------------------------------------------
47 #include "utils/elog.h"
48 #include "utils/palloc.h"
50 /* ----------------------------------------------------------------
51 * Section 1: variable-length datatypes (TOAST support)
52 * ----------------------------------------------------------------
56 * struct varatt_external is a traditional "TOAST pointer", that is, the
57 * information needed to fetch a Datum stored out-of-line in a TOAST table.
58 * The data is compressed if and only if va_extsize < va_rawsize - VARHDRSZ.
59 * This struct must not contain any padding, because we sometimes compare
60 * these pointers using memcmp.
62 * Note that this information is stored unaligned within actual tuples, so
63 * you need to memcpy from the tuple into a local struct variable before
64 * you can look at these fields! (The reason we use memcmp is to avoid
65 * having to do that just to detect equality of two TOAST pointers...)
67 typedef struct varatt_external
69 int32 va_rawsize; /* Original data size (includes header) */
70 int32 va_extsize; /* External saved size (doesn't) */
71 Oid va_valueid; /* Unique ID of value within TOAST table */
72 Oid va_toastrelid; /* RelID of TOAST table containing it */
76 * struct varatt_indirect is a "TOAST pointer" representing an out-of-line
77 * Datum that's stored in memory, not in an external toast relation.
78 * The creator of such a Datum is entirely responsible that the referenced
79 * storage survives for as long as referencing pointer Datums can exist.
81 * Note that just as for struct varatt_external, this struct is stored
82 * unaligned within any containing tuple.
84 typedef struct varatt_indirect
86 struct varlena *pointer; /* Pointer to in-memory varlena */
90 * struct varatt_expanded is a "TOAST pointer" representing an out-of-line
91 * Datum that is stored in memory, in some type-specific, not necessarily
92 * physically contiguous format that is convenient for computation not
93 * storage. APIs for this, in particular the definition of struct
94 * ExpandedObjectHeader, are in src/include/utils/expandeddatum.h.
96 * Note that just as for struct varatt_external, this struct is stored
97 * unaligned within any containing tuple.
99 typedef struct ExpandedObjectHeader ExpandedObjectHeader;
101 typedef struct varatt_expanded
103 ExpandedObjectHeader *eohptr;
107 * Type tag for the various sorts of "TOAST pointer" datums. The peculiar
108 * value for VARTAG_ONDISK comes from a requirement for on-disk compatibility
109 * with a previous notion that the tag field was the pointer datum's length.
111 typedef enum vartag_external
114 VARTAG_EXPANDED_RO = 2,
115 VARTAG_EXPANDED_RW = 3,
119 /* this test relies on the specific tag values above */
120 #define VARTAG_IS_EXPANDED(tag) \
121 (((tag) & ~1) == VARTAG_EXPANDED_RO)
123 #define VARTAG_SIZE(tag) \
124 ((tag) == VARTAG_INDIRECT ? sizeof(varatt_indirect) : \
125 VARTAG_IS_EXPANDED(tag) ? sizeof(varatt_expanded) : \
126 (tag) == VARTAG_ONDISK ? sizeof(varatt_external) : \
127 TrapMacro(true, "unrecognized TOAST vartag"))
130 * These structs describe the header of a varlena object that may have been
131 * TOASTed. Generally, don't reference these structs directly, but use the
134 * We use separate structs for the aligned and unaligned cases because the
135 * compiler might otherwise think it could generate code that assumes
136 * alignment while touching fields of a 1-byte-header varlena.
140 struct /* Normal varlena (4-byte length) */
143 char va_data[FLEXIBLE_ARRAY_MEMBER];
145 struct /* Compressed-in-line format */
148 uint32 va_rawsize; /* Original data size (excludes header) */
149 char va_data[FLEXIBLE_ARRAY_MEMBER]; /* Compressed data */
156 char va_data[FLEXIBLE_ARRAY_MEMBER]; /* Data begins here */
159 /* TOAST pointers are a subset of varattrib_1b with an identifying tag byte */
162 uint8 va_header; /* Always 0x80 or 0x01 */
163 uint8 va_tag; /* Type of datum */
164 char va_data[FLEXIBLE_ARRAY_MEMBER]; /* Type-specific data */
168 * Bit layouts for varlena headers on big-endian machines:
170 * 00xxxxxx 4-byte length word, aligned, uncompressed data (up to 1G)
171 * 01xxxxxx 4-byte length word, aligned, *compressed* data (up to 1G)
172 * 10000000 1-byte length word, unaligned, TOAST pointer
173 * 1xxxxxxx 1-byte length word, unaligned, uncompressed data (up to 126b)
175 * Bit layouts for varlena headers on little-endian machines:
177 * xxxxxx00 4-byte length word, aligned, uncompressed data (up to 1G)
178 * xxxxxx10 4-byte length word, aligned, *compressed* data (up to 1G)
179 * 00000001 1-byte length word, unaligned, TOAST pointer
180 * xxxxxxx1 1-byte length word, unaligned, uncompressed data (up to 126b)
182 * The "xxx" bits are the length field (which includes itself in all cases).
183 * In the big-endian case we mask to extract the length, in the little-endian
184 * case we shift. Note that in both cases the flag bits are in the physically
185 * first byte. Also, it is not possible for a 1-byte length word to be zero;
186 * this lets us disambiguate alignment padding bytes from the start of an
187 * unaligned datum. (We now *require* pad bytes to be filled with zero!)
189 * In TOAST pointers the va_tag field (see varattrib_1b_e) is used to discern
190 * the specific type and length of the pointer datum.
194 * Endian-dependent macros. These are considered internal --- use the
195 * external macros below instead of using these directly.
197 * Note: IS_1B is true for external toast records but VARSIZE_1B will return 0
198 * for such records. Hence you should usually check for IS_EXTERNAL before
199 * checking for IS_1B.
202 #ifdef WORDS_BIGENDIAN
204 #define VARATT_IS_4B(PTR) \
205 ((((varattrib_1b *) (PTR))->va_header & 0x80) == 0x00)
206 #define VARATT_IS_4B_U(PTR) \
207 ((((varattrib_1b *) (PTR))->va_header & 0xC0) == 0x00)
208 #define VARATT_IS_4B_C(PTR) \
209 ((((varattrib_1b *) (PTR))->va_header & 0xC0) == 0x40)
210 #define VARATT_IS_1B(PTR) \
211 ((((varattrib_1b *) (PTR))->va_header & 0x80) == 0x80)
212 #define VARATT_IS_1B_E(PTR) \
213 ((((varattrib_1b *) (PTR))->va_header) == 0x80)
214 #define VARATT_NOT_PAD_BYTE(PTR) \
215 (*((uint8 *) (PTR)) != 0)
217 /* VARSIZE_4B() should only be used on known-aligned data */
218 #define VARSIZE_4B(PTR) \
219 (((varattrib_4b *) (PTR))->va_4byte.va_header & 0x3FFFFFFF)
220 #define VARSIZE_1B(PTR) \
221 (((varattrib_1b *) (PTR))->va_header & 0x7F)
222 #define VARTAG_1B_E(PTR) \
223 (((varattrib_1b_e *) (PTR))->va_tag)
225 #define SET_VARSIZE_4B(PTR,len) \
226 (((varattrib_4b *) (PTR))->va_4byte.va_header = (len) & 0x3FFFFFFF)
227 #define SET_VARSIZE_4B_C(PTR,len) \
228 (((varattrib_4b *) (PTR))->va_4byte.va_header = ((len) & 0x3FFFFFFF) | 0x40000000)
229 #define SET_VARSIZE_1B(PTR,len) \
230 (((varattrib_1b *) (PTR))->va_header = (len) | 0x80)
231 #define SET_VARTAG_1B_E(PTR,tag) \
232 (((varattrib_1b_e *) (PTR))->va_header = 0x80, \
233 ((varattrib_1b_e *) (PTR))->va_tag = (tag))
234 #else /* !WORDS_BIGENDIAN */
236 #define VARATT_IS_4B(PTR) \
237 ((((varattrib_1b *) (PTR))->va_header & 0x01) == 0x00)
238 #define VARATT_IS_4B_U(PTR) \
239 ((((varattrib_1b *) (PTR))->va_header & 0x03) == 0x00)
240 #define VARATT_IS_4B_C(PTR) \
241 ((((varattrib_1b *) (PTR))->va_header & 0x03) == 0x02)
242 #define VARATT_IS_1B(PTR) \
243 ((((varattrib_1b *) (PTR))->va_header & 0x01) == 0x01)
244 #define VARATT_IS_1B_E(PTR) \
245 ((((varattrib_1b *) (PTR))->va_header) == 0x01)
246 #define VARATT_NOT_PAD_BYTE(PTR) \
247 (*((uint8 *) (PTR)) != 0)
249 /* VARSIZE_4B() should only be used on known-aligned data */
250 #define VARSIZE_4B(PTR) \
251 ((((varattrib_4b *) (PTR))->va_4byte.va_header >> 2) & 0x3FFFFFFF)
252 #define VARSIZE_1B(PTR) \
253 ((((varattrib_1b *) (PTR))->va_header >> 1) & 0x7F)
254 #define VARTAG_1B_E(PTR) \
255 (((varattrib_1b_e *) (PTR))->va_tag)
257 #define SET_VARSIZE_4B(PTR,len) \
258 (((varattrib_4b *) (PTR))->va_4byte.va_header = (((uint32) (len)) << 2))
259 #define SET_VARSIZE_4B_C(PTR,len) \
260 (((varattrib_4b *) (PTR))->va_4byte.va_header = (((uint32) (len)) << 2) | 0x02)
261 #define SET_VARSIZE_1B(PTR,len) \
262 (((varattrib_1b *) (PTR))->va_header = (((uint8) (len)) << 1) | 0x01)
263 #define SET_VARTAG_1B_E(PTR,tag) \
264 (((varattrib_1b_e *) (PTR))->va_header = 0x01, \
265 ((varattrib_1b_e *) (PTR))->va_tag = (tag))
266 #endif /* WORDS_BIGENDIAN */
268 #define VARHDRSZ_SHORT offsetof(varattrib_1b, va_data)
269 #define VARATT_SHORT_MAX 0x7F
270 #define VARATT_CAN_MAKE_SHORT(PTR) \
271 (VARATT_IS_4B_U(PTR) && \
272 (VARSIZE(PTR) - VARHDRSZ + VARHDRSZ_SHORT) <= VARATT_SHORT_MAX)
273 #define VARATT_CONVERTED_SHORT_SIZE(PTR) \
274 (VARSIZE(PTR) - VARHDRSZ + VARHDRSZ_SHORT)
276 #define VARHDRSZ_EXTERNAL offsetof(varattrib_1b_e, va_data)
278 #define VARDATA_4B(PTR) (((varattrib_4b *) (PTR))->va_4byte.va_data)
279 #define VARDATA_4B_C(PTR) (((varattrib_4b *) (PTR))->va_compressed.va_data)
280 #define VARDATA_1B(PTR) (((varattrib_1b *) (PTR))->va_data)
281 #define VARDATA_1B_E(PTR) (((varattrib_1b_e *) (PTR))->va_data)
283 #define VARRAWSIZE_4B_C(PTR) \
284 (((varattrib_4b *) (PTR))->va_compressed.va_rawsize)
286 /* Externally visible macros */
289 * In consumers oblivious to data alignment, call PG_DETOAST_DATUM_PACKED(),
290 * VARDATA_ANY(), VARSIZE_ANY() and VARSIZE_ANY_EXHDR(). Elsewhere, call
291 * PG_DETOAST_DATUM(), VARDATA() and VARSIZE(). Directly fetching an int16,
292 * int32 or wider field in the struct representing the datum layout requires
293 * aligned data. memcpy() is alignment-oblivious, as are most operations on
294 * datatypes, such as text, whose layout struct contains only char fields.
296 * Code assembling a new datum should call VARDATA() and SET_VARSIZE().
297 * (Datums begin life untoasted.)
299 * Other macros here should usually be used only by tuple assembly/disassembly
300 * code and code that specifically wants to work with still-toasted Datums.
302 #define VARDATA(PTR) VARDATA_4B(PTR)
303 #define VARSIZE(PTR) VARSIZE_4B(PTR)
305 #define VARSIZE_SHORT(PTR) VARSIZE_1B(PTR)
306 #define VARDATA_SHORT(PTR) VARDATA_1B(PTR)
308 #define VARTAG_EXTERNAL(PTR) VARTAG_1B_E(PTR)
309 #define VARSIZE_EXTERNAL(PTR) (VARHDRSZ_EXTERNAL + VARTAG_SIZE(VARTAG_EXTERNAL(PTR)))
310 #define VARDATA_EXTERNAL(PTR) VARDATA_1B_E(PTR)
312 #define VARATT_IS_COMPRESSED(PTR) VARATT_IS_4B_C(PTR)
313 #define VARATT_IS_EXTERNAL(PTR) VARATT_IS_1B_E(PTR)
314 #define VARATT_IS_EXTERNAL_ONDISK(PTR) \
315 (VARATT_IS_EXTERNAL(PTR) && VARTAG_EXTERNAL(PTR) == VARTAG_ONDISK)
316 #define VARATT_IS_EXTERNAL_INDIRECT(PTR) \
317 (VARATT_IS_EXTERNAL(PTR) && VARTAG_EXTERNAL(PTR) == VARTAG_INDIRECT)
318 #define VARATT_IS_EXTERNAL_EXPANDED_RO(PTR) \
319 (VARATT_IS_EXTERNAL(PTR) && VARTAG_EXTERNAL(PTR) == VARTAG_EXPANDED_RO)
320 #define VARATT_IS_EXTERNAL_EXPANDED_RW(PTR) \
321 (VARATT_IS_EXTERNAL(PTR) && VARTAG_EXTERNAL(PTR) == VARTAG_EXPANDED_RW)
322 #define VARATT_IS_EXTERNAL_EXPANDED(PTR) \
323 (VARATT_IS_EXTERNAL(PTR) && VARTAG_IS_EXPANDED(VARTAG_EXTERNAL(PTR)))
324 #define VARATT_IS_EXTERNAL_NON_EXPANDED(PTR) \
325 (VARATT_IS_EXTERNAL(PTR) && !VARTAG_IS_EXPANDED(VARTAG_EXTERNAL(PTR)))
326 #define VARATT_IS_SHORT(PTR) VARATT_IS_1B(PTR)
327 #define VARATT_IS_EXTENDED(PTR) (!VARATT_IS_4B_U(PTR))
329 #define SET_VARSIZE(PTR, len) SET_VARSIZE_4B(PTR, len)
330 #define SET_VARSIZE_SHORT(PTR, len) SET_VARSIZE_1B(PTR, len)
331 #define SET_VARSIZE_COMPRESSED(PTR, len) SET_VARSIZE_4B_C(PTR, len)
333 #define SET_VARTAG_EXTERNAL(PTR, tag) SET_VARTAG_1B_E(PTR, tag)
335 #define VARSIZE_ANY(PTR) \
336 (VARATT_IS_1B_E(PTR) ? VARSIZE_EXTERNAL(PTR) : \
337 (VARATT_IS_1B(PTR) ? VARSIZE_1B(PTR) : \
340 /* Size of a varlena data, excluding header */
341 #define VARSIZE_ANY_EXHDR(PTR) \
342 (VARATT_IS_1B_E(PTR) ? VARSIZE_EXTERNAL(PTR)-VARHDRSZ_EXTERNAL : \
343 (VARATT_IS_1B(PTR) ? VARSIZE_1B(PTR)-VARHDRSZ_SHORT : \
344 VARSIZE_4B(PTR)-VARHDRSZ))
346 /* caution: this will not work on an external or compressed-in-line Datum */
347 /* caution: this will return a possibly unaligned pointer */
348 #define VARDATA_ANY(PTR) \
349 (VARATT_IS_1B(PTR) ? VARDATA_1B(PTR) : VARDATA_4B(PTR))
352 /* ----------------------------------------------------------------
353 * Section 2: Datum type + support macros
354 * ----------------------------------------------------------------
358 * A Datum contains either a value of a pass-by-value type or a pointer to a
359 * value of a pass-by-reference type. Therefore, we require:
361 * sizeof(Datum) == sizeof(void *) == 4 or 8
363 * The macros below and the analogous macros for other types should be used to
364 * convert between a Datum and the appropriate C type.
367 typedef uintptr_t Datum;
370 * A NullableDatum is used in places where both a Datum and its nullness needs
371 * to be stored. This can be more efficient than storing datums and nullness
372 * in separate arrays, due to better spatial locality, even if more space may
373 * be wasted due to padding.
375 typedef struct NullableDatum
377 #define FIELDNO_NULLABLE_DATUM_DATUM 0
379 #define FIELDNO_NULLABLE_DATUM_ISNULL 1
381 /* due to alignment padding this could be used for flags for free */
384 #define SIZEOF_DATUM SIZEOF_VOID_P
388 * Returns boolean value of a datum.
390 * Note: any nonzero value will be considered true.
393 #define DatumGetBool(X) ((bool) ((X) != 0))
397 * Returns datum representation for a boolean.
399 * Note: any nonzero value will be considered true.
402 #define BoolGetDatum(X) ((Datum) ((X) ? 1 : 0))
406 * Returns character value of a datum.
409 #define DatumGetChar(X) ((char) (X))
413 * Returns datum representation for a character.
416 #define CharGetDatum(X) ((Datum) (X))
420 * Returns datum representation for an 8-bit integer.
423 #define Int8GetDatum(X) ((Datum) (X))
427 * Returns 8-bit unsigned integer value of a datum.
430 #define DatumGetUInt8(X) ((uint8) (X))
434 * Returns datum representation for an 8-bit unsigned integer.
437 #define UInt8GetDatum(X) ((Datum) (X))
441 * Returns 16-bit integer value of a datum.
444 #define DatumGetInt16(X) ((int16) (X))
448 * Returns datum representation for a 16-bit integer.
451 #define Int16GetDatum(X) ((Datum) (X))
455 * Returns 16-bit unsigned integer value of a datum.
458 #define DatumGetUInt16(X) ((uint16) (X))
462 * Returns datum representation for a 16-bit unsigned integer.
465 #define UInt16GetDatum(X) ((Datum) (X))
469 * Returns 32-bit integer value of a datum.
472 #define DatumGetInt32(X) ((int32) (X))
476 * Returns datum representation for a 32-bit integer.
479 #define Int32GetDatum(X) ((Datum) (X))
483 * Returns 32-bit unsigned integer value of a datum.
486 #define DatumGetUInt32(X) ((uint32) (X))
490 * Returns datum representation for a 32-bit unsigned integer.
493 #define UInt32GetDatum(X) ((Datum) (X))
497 * Returns object identifier value of a datum.
500 #define DatumGetObjectId(X) ((Oid) (X))
504 * Returns datum representation for an object identifier.
507 #define ObjectIdGetDatum(X) ((Datum) (X))
510 * DatumGetTransactionId
511 * Returns transaction identifier value of a datum.
514 #define DatumGetTransactionId(X) ((TransactionId) (X))
517 * TransactionIdGetDatum
518 * Returns datum representation for a transaction identifier.
521 #define TransactionIdGetDatum(X) ((Datum) (X))
524 * MultiXactIdGetDatum
525 * Returns datum representation for a multixact identifier.
528 #define MultiXactIdGetDatum(X) ((Datum) (X))
532 * Returns command identifier value of a datum.
535 #define DatumGetCommandId(X) ((CommandId) (X))
539 * Returns datum representation for a command identifier.
542 #define CommandIdGetDatum(X) ((Datum) (X))
546 * Returns pointer value of a datum.
549 #define DatumGetPointer(X) ((Pointer) (X))
553 * Returns datum representation for a pointer.
556 #define PointerGetDatum(X) ((Datum) (X))
560 * Returns C string (null-terminated string) value of a datum.
562 * Note: C string is not a full-fledged Postgres type at present,
563 * but type input functions use this conversion for their inputs.
566 #define DatumGetCString(X) ((char *) DatumGetPointer(X))
570 * Returns datum representation for a C string (null-terminated string).
572 * Note: C string is not a full-fledged Postgres type at present,
573 * but type output functions use this conversion for their outputs.
574 * Note: CString is pass-by-reference; caller must ensure the pointed-to
575 * value has adequate lifetime.
578 #define CStringGetDatum(X) PointerGetDatum(X)
582 * Returns name value of a datum.
585 #define DatumGetName(X) ((Name) DatumGetPointer(X))
589 * Returns datum representation for a name.
591 * Note: Name is pass-by-reference; caller must ensure the pointed-to
592 * value has adequate lifetime.
595 #define NameGetDatum(X) CStringGetDatum(NameStr(*(X)))
599 * Returns 64-bit integer value of a datum.
601 * Note: this macro hides whether int64 is pass by value or by reference.
604 #ifdef USE_FLOAT8_BYVAL
605 #define DatumGetInt64(X) ((int64) (X))
607 #define DatumGetInt64(X) (* ((int64 *) DatumGetPointer(X)))
612 * Returns datum representation for a 64-bit integer.
614 * Note: if int64 is pass by reference, this function returns a reference
618 #ifdef USE_FLOAT8_BYVAL
619 #define Int64GetDatum(X) ((Datum) (X))
621 extern Datum Int64GetDatum(int64 X);
626 * Returns 64-bit unsigned integer value of a datum.
628 * Note: this macro hides whether int64 is pass by value or by reference.
631 #ifdef USE_FLOAT8_BYVAL
632 #define DatumGetUInt64(X) ((uint64) (X))
634 #define DatumGetUInt64(X) (* ((uint64 *) DatumGetPointer(X)))
639 * Returns datum representation for a 64-bit unsigned integer.
641 * Note: if int64 is pass by reference, this function returns a reference
645 #ifdef USE_FLOAT8_BYVAL
646 #define UInt64GetDatum(X) ((Datum) (X))
648 #define UInt64GetDatum(X) Int64GetDatum((int64) (X))
652 * Float <-> Datum conversions
654 * These have to be implemented as inline functions rather than macros, when
655 * passing by value, because many machines pass int and float function
656 * parameters/results differently; so we need to play weird games with unions.
661 * Returns 4-byte floating point value of a datum.
663 * Note: this macro hides whether float4 is pass by value or by reference.
666 #ifdef USE_FLOAT4_BYVAL
668 DatumGetFloat4(Datum X)
676 myunion.value = DatumGetInt32(X);
677 return myunion.retval;
680 #define DatumGetFloat4(X) (* ((float4 *) DatumGetPointer(X)))
685 * Returns datum representation for a 4-byte floating point number.
687 * Note: if float4 is pass by reference, this function returns a reference
690 #ifdef USE_FLOAT4_BYVAL
692 Float4GetDatum(float4 X)
701 return Int32GetDatum(myunion.retval);
704 extern Datum Float4GetDatum(float4 X);
709 * Returns 8-byte floating point value of a datum.
711 * Note: this macro hides whether float8 is pass by value or by reference.
714 #ifdef USE_FLOAT8_BYVAL
716 DatumGetFloat8(Datum X)
724 myunion.value = DatumGetInt64(X);
725 return myunion.retval;
728 #define DatumGetFloat8(X) (* ((float8 *) DatumGetPointer(X)))
733 * Returns datum representation for an 8-byte floating point number.
735 * Note: if float8 is pass by reference, this function returns a reference
739 #ifdef USE_FLOAT8_BYVAL
741 Float8GetDatum(float8 X)
750 return Int64GetDatum(myunion.retval);
753 extern Datum Float8GetDatum(float8 X);
762 * These macros are intended to allow writing code that does not depend on
763 * whether int64, float8, float4 are pass-by-reference types, while not
764 * sacrificing performance when they are. The argument must be a variable
765 * that will exist and have the same value for as long as the Datum is needed.
766 * In the pass-by-ref case, the address of the variable is taken to use as
767 * the Datum. In the pass-by-val case, these will be the same as the non-Fast
771 #ifdef USE_FLOAT8_BYVAL
772 #define Int64GetDatumFast(X) Int64GetDatum(X)
773 #define Float8GetDatumFast(X) Float8GetDatum(X)
775 #define Int64GetDatumFast(X) PointerGetDatum(&(X))
776 #define Float8GetDatumFast(X) PointerGetDatum(&(X))
779 #ifdef USE_FLOAT4_BYVAL
780 #define Float4GetDatumFast(X) Float4GetDatum(X)
782 #define Float4GetDatumFast(X) PointerGetDatum(&(X))
785 #endif /* POSTGRES_H */