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Add the ability to disable the covering-index-scan optimization at compile-time,

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start-time, or at run-time.  Add test cases to check this configurability.

FossilOrigin-Name: ccb8ecc30c8e6c7760131250297c2e452bbac43b
This commit is contained in:
drh
2012-09-17 20:44:46 +00:00
parent ee4b21e9f3
commit de9a7b8a94
11 changed files with 170 additions and 16 deletions
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2
src/sqliteInt.h
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@@ -968,6 +968,7 @@ struct sqlite3 {
#define SQLITE_FactorOutConst 0x08 /* Disable factoring out constants */
#define SQLITE_IdxRealAsInt 0x10 /* Store REAL as INT in indices */
#define SQLITE_DistinctOpt 0x20 /* DISTINCT using indexes */
#define SQLITE_CoverIdxScan 0x40 /* Disable covering index scans */
#define SQLITE_OptMask 0xff /* Mask of all disablable opts */
/*
@@ -2461,6 +2462,7 @@ struct Sqlite3Config {
int bCoreMutex; /* True to enable core mutexing */
int bFullMutex; /* True to enable full mutexing */
int bOpenUri; /* True to interpret filenames as URIs */
int bUseCis; /* Use covering indices for full-scans */
int mxStrlen; /* Maximum string length */
int szLookaside; /* Default lookaside buffer size */
int nLookaside; /* Default lookaside buffer count */