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Attempt to use sqlite_stat4 data to estimate the number of rows visited by a range query that uses a skip-scan. This code is largely untested.

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FossilOrigin-Name: 01dc8102592427b71a18c2cb82301d2266dd59c2
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dan
2014-06-26 20:21:46 +00:00
parent a9bc3cf736
commit b0b8290ecb
5 changed files with 300 additions and 123 deletions
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src/sqliteInt.h
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@@ -3431,7 +3431,9 @@ void sqlite3BackupUpdate(sqlite3_backup *, Pgno, const u8 *);
#ifdef SQLITE_ENABLE_STAT3_OR_STAT4
void sqlite3AnalyzeFunctions(void);
int sqlite3Stat4ProbeSetValue(Parse*,Index*,UnpackedRecord**,Expr*,u8,int,int*);
int sqlite3Stat4ValueFromExpr(Parse*, Expr*, u8, sqlite3_value**);
void sqlite3Stat4ProbeFree(UnpackedRecord*);
int sqlite3Stat4Column(sqlite3*, const void*, int, int, sqlite3_value**);
#endif
/*