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Support INCLUDE'd columns in SP-GiST.

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Not much to say here: does what it says on the tin.
We steal a previously-always-zero bit from the nextOffset
field of leaf index tuples in order to track whether there
is a nulls bitmap.  Otherwise it works about like included
columns in other index types.

Pavel Borisov, reviewed by Andrey Borodin and Anastasia Lubennikova,
and rather heavily editorialized on by me

Discussion: https://postgr.es/m/CALT9ZEFi-vMp4faht9f9Junb1nO3NOSjhpxTmbm1UGLMsLqiEQ@mail.gmail.com
This commit is contained in:
Tom Lane
2021-04-05 18:41:09 -04:00
parent 49f49defe7
commit 09c1c6ab4b
21 changed files with 630 additions and 232 deletions
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33
src/backend/access/common/indextuple.c
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@@ -446,22 +446,37 @@ void
index_deform_tuple(IndexTuple tup, TupleDesc tupleDescriptor,
Datum *values, bool *isnull)
{
int hasnulls = IndexTupleHasNulls(tup);
int natts = tupleDescriptor->natts; /* number of atts to extract */
int attnum;
char *tp; /* ptr to tuple data */
int off; /* offset in tuple data */
bits8 *bp; /* ptr to null bitmap in tuple */
bool slow = false; /* can we use/set attcacheoff? */
/* Assert to protect callers who allocate fixed-size arrays */
Assert(natts <= INDEX_MAX_KEYS);
/* XXX "knows" t_bits are just after fixed tuple header! */
bp = (bits8 *) ((char *) tup + sizeof(IndexTupleData));
tp = (char *) tup + IndexInfoFindDataOffset(tup->t_info);
off = 0;
index_deform_tuple_internal(tupleDescriptor, values, isnull,
tp, bp, IndexTupleHasNulls(tup));
}
/*
* Convert an index tuple into Datum/isnull arrays,
* without assuming any specific layout of the index tuple header.
*
* Caller must supply pointer to data area, pointer to nulls bitmap
* (which can be NULL if !hasnulls), and hasnulls flag.
*/
void
index_deform_tuple_internal(TupleDesc tupleDescriptor,
Datum *values, bool *isnull,
char *tp, bits8 *bp, int hasnulls)
{
int natts = tupleDescriptor->natts; /* number of atts to extract */
int attnum;
int off = 0; /* offset in tuple data */
bool slow = false; /* can we use/set attcacheoff? */
/* Assert to protect callers who allocate fixed-size arrays */
Assert(natts <= INDEX_MAX_KEYS);
for (attnum = 0; attnum < natts; attnum++)
{