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Enhance the use of the column cache for UPDATE statements, making them

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more efficient for the case where a column is modified to be an expression
of other unmodified columns.

FossilOrigin-Name: 871e091df651b2275a672c35ff938bd4b6db0d7f
This commit is contained in:
drh
2015-10-15 19:21:51 +00:00
parent fed7ac6f04
commit ce78bc6e7e
7 changed files with 34 additions and 28 deletions
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src/sqliteInt.h
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@@ -3393,6 +3393,7 @@ int sqlite3WhereOkOnePass(WhereInfo*, int*);
#define ONEPASS_MULTI 2 /* ONEPASS is valid for multiple rows */
void sqlite3ExprCodeLoadIndexColumn(Parse*, Index*, int, int, int);
int sqlite3ExprCodeGetColumn(Parse*, Table*, int, int, int, u8);
void sqlite3ExprCodeGetColumnToReg(Parse*, Table*, int, int, int);
void sqlite3ExprCodeGetColumnOfTable(Vdbe*, Table*, int, int, int);
void sqlite3ExprCodeMove(Parse*, int, int, int);
void sqlite3ExprCacheStore(Parse*, int, int, int);