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If the SQLITE_ENABLE_CURSOR_HINTS macro is defined, then invoke the

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sqlite3BtreeCursorHint() interface to provide hints to the storage engine
about rows that need not be returned.  Hints can be disabled using
SQLITE_TESTCTRL_OPTIMIZATIONS with SQLITE_CursorHints (0x2000).  Cursor
hints are not used by the built-in storage engine of SQLite but might
be useful to applications that provide their own storage engine.  The
current code is work-in-progrss and contains bugs.

FossilOrigin-Name: 3a9bec524ef2de44028b4058e67dc962082888d3
This commit is contained in:
drh
2013-12-07 20:39:19 +00:00
parent 9dcc7cd527
commit 28935364ef
9 changed files with 124 additions and 13 deletions
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3
src/btree.h
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@@ -167,6 +167,9 @@ int sqlite3BtreeMovetoUnpacked(
int *pRes
);
int sqlite3BtreeCursorHasMoved(BtCursor*, int*);
#ifdef SQLITE_ENABLE_CURSOR_HINTS
void sqlite3BtreeCursorHint(BtCursor*, int, const Expr*);
#endif
int sqlite3BtreeDelete(BtCursor*);
int sqlite3BtreeInsert(BtCursor*, const void *pKey, i64 nKey,
const void *pData, int nData,