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Fix contrib/bloom to not fail under CLOBBER_CACHE_ALWAYS. 

The code was supposing that rd_amcache wouldn't disappear from under it
during a scan; which is wrong.  Copy the data out of the relcache rather
than trying to reference it there.
This commit is contained in:
Tom Lane 2016-04-03 15:16:07 -04:00
parent a9284849b4
commit 8f75fd1f40
3 changed files with 8 additions and 9 deletions
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5
contrib/bloom/bloom.h
View File

@ -110,12 +110,11 @@ typedef struct BloomMetaPageData
typedef struct BloomState
{
FmgrInfo hashFn[INDEX_MAX_KEYS];
BloomOptions *opts; /* stored in rd_amcache and defined at
* creation time */
BloomOptions opts; /* copy of options on index's metapage */
int32 nColumns;
/*
* sizeOfBloomTuple is index's specific, and it depends on reloptions, so
* sizeOfBloomTuple is index-specific, and it depends on reloptions, so
* precompute it
*/
Size sizeOfBloomTuple;

4
contrib/bloom/blscan.c
View File

@ -99,7 +99,7 @@ blgetbitmap(IndexScanDesc scan, TIDBitmap *tbm)
/* New search: have to calculate search signature */
ScanKey skey = scan->keyData;
so->sign = palloc0(sizeof(SignType) * so->state.opts->bloomLength);
so->sign = palloc0(sizeof(SignType) * so->state.opts.bloomLength);
for (i = 0; i < scan->numberOfKeys; i++)
{
@ -151,7 +151,7 @@ blgetbitmap(IndexScanDesc scan, TIDBitmap *tbm)
bool res = true;
/* Check index signature with scan signature */
for (i = 0; i < so->state.opts->bloomLength; i++)
for (i = 0; i < so->state.opts.bloomLength; i++)
{
if ((itup->sign[i] & so->sign[i]) != so->sign[i])
{

8
contrib/bloom/blutils.c
View File

@ -155,9 +155,9 @@ initBloomState(BloomState *state, Relation index)
index->rd_amcache = (void *) opts;
}
state->opts = (BloomOptions *) index->rd_amcache;
memcpy(&state->opts, index->rd_amcache, sizeof(state->opts));
state->sizeOfBloomTuple = BLOOMTUPLEHDRSZ +
sizeof(SignType) * state->opts->bloomLength;
sizeof(SignType) * state->opts.bloomLength;
}
/*
@ -228,10 +228,10 @@ signValue(BloomState *state, SignType *sign, Datum value, int attno)
hashVal = DatumGetInt32(FunctionCall1(&state->hashFn[attno], value));
mySrand(hashVal ^ myRand());
for (j = 0; j < state->opts->bitSize[attno]; j++)
for (j = 0; j < state->opts.bitSize[attno]; j++)
{
/* prevent mutiple evaluation */
nBit = myRand() % (state->opts->bloomLength * BITSIGNTYPE);
nBit = myRand() % (state->opts.bloomLength * BITSIGNTYPE);
SETBIT(sign, nBit);
}
}