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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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src/sqliteInt.h
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@@ -1064,6 +1064,7 @@ struct sqlite3 {
#define SQLITE_OmitNoopJoin 0x0400 /* Omit unused tables in joins */
#define SQLITE_Stat3 0x0800 /* Use the SQLITE_STAT3 table */
#define SQLITE_AdjustOutEst 0x1000 /* Adjust output estimates using WHERE */
#define SQLITE_CursorHints 0x2000 /* Add OP_CursorHint opcodes */
#define SQLITE_AllOpts 0xffff /* All optimizations */
/*