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Fix a problem reading from temp databases in SQLITE_DIRECT_OVERFLOW_READ

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FossilOrigin-Name: 81629ba91475938b6ad528e7b1dbef4ad22239782bb2e9c1bb59413aba11da87
This commit is contained in:
dan
2018-11-22 19:10:14 +00:00
parent 8055a3ead4
commit 09236755ee
8 changed files with 78 additions and 20 deletions
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24
src/pager.c
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@@ -825,6 +825,30 @@ static const unsigned char aJournalMagic[] = {
*/
#define isOpen(pFd) ((pFd)->pMethods!=0)
#ifdef SQLITE_DIRECT_OVERFLOW_READ
/*
** Return true if page pgno can be read directly from the database file
** by the b-tree layer. This is the case if:
**
** * the database file is open,
** * there are no dirty pages in the cache, and
** * the desired page is not currently in the wal file.
*/
int sqlite3PagerDirectReadOk(Pager *pPager, Pgno pgno){
if( pPager->fd->pMethods==0 ) return 0;
if( sqlite3PCacheIsDirty(pPager->pPCache) ) return 0;
#ifndef SQLITE_OMIT_WAL
if( pPager->pWal ){
u32 iRead = 0;
int rc;
rc = sqlite3WalFindFrame(pPager->pWal, pgno, &iRead);
return (rc==SQLITE_OK && iRead==0);
}
#endif
return 1;
}
#endif
/*
** Return true if this pager uses a write-ahead log to read page pgno.
** Return false if the pager reads pgno directly from the database.