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When estimating the number of rows scanned using data from the sqlite_stat4 table, avoid allocating UnpackedRecord and KeyInfo structures until they are definitely required.

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FossilOrigin-Name: 353950a5269fa439cc3e57b62e16558a84ea2557
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dan
2013-08-07 15:52:41 +00:00
parent ddc2d6e8f5
commit 87cd93215e
5 changed files with 183 additions and 97 deletions
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5
src/sqliteInt.h
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@@ -1545,7 +1545,7 @@ struct Index {
unsigned autoIndex:2; /* 1==UNIQUE, 2==PRIMARY KEY, 0==CREATE INDEX */
unsigned bUnordered:1; /* Use this index for == or IN queries only */
unsigned uniqNotNull:1; /* True if UNIQUE and NOT NULL for all columns */
#ifdef SQLITE_ENABLE_STAT3
#ifdef SQLITE_ENABLE_STAT4
int nSample; /* Number of elements in aSample[] */
tRowcnt avgEq; /* Average nEq value for key values not in aSample */
IndexSample *aSample; /* Samples of the left-most key */
@@ -3101,9 +3101,8 @@ Expr *sqlite3CreateColumnExpr(sqlite3 *, SrcList *, int, int);
void sqlite3BackupRestart(sqlite3_backup *);
void sqlite3BackupUpdate(sqlite3_backup *, Pgno, const u8 *);
int sqlite3Stat4ProbeSetValue(Parse*, UnpackedRecord*, Expr*, u8, int, int*);
int sqlite3Stat4ProbeSetValue(Parse*,Index*,UnpackedRecord**,Expr*,u8,int,int*);
void sqlite3Stat4ProbeFree(UnpackedRecord*);
int sqlite3Stat4ProbeNew(Parse*, Index*, UnpackedRecord**);
/*
** The interface to the LEMON-generated parser