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Restore the LEFT JOIN strength reduction that was partially lost in

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[d747afda5683ca5f] when strength reduction was generalized to all OUTER JOINs.

FossilOrigin-Name: 2d962b84dd8ac2d0968f0283f8f082c1c2a7a1f99b59053b2ad8f58745396447
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drh
2023-06-02 18:05:54 +00:00
parent a3f943942c
commit 038158e94a
5 changed files with 31 additions and 16 deletions
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src/sqliteInt.h
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@@ -4169,6 +4169,7 @@ struct Walker {
void (*xSelectCallback2)(Walker*,Select*);/* Second callback for SELECTs */
int walkerDepth; /* Number of subqueries */
u16 eCode; /* A small processing code */
u16 mWFlags; /* Use-dependent flags */
union { /* Extra data for callback */
NameContext *pNC; /* Naming context */
int n; /* A counter */
@@ -4879,7 +4880,7 @@ int sqlite3ExprCompare(const Parse*,const Expr*,const Expr*, int);
int sqlite3ExprCompareSkip(Expr*,Expr*,int);
int sqlite3ExprListCompare(const ExprList*,const ExprList*, int);
int sqlite3ExprImpliesExpr(const Parse*,const Expr*,const Expr*, int);
int sqlite3ExprImpliesNonNullRow(Expr*,int);
int sqlite3ExprImpliesNonNullRow(Expr*,int,int);
void sqlite3AggInfoPersistWalkerInit(Walker*,Parse*);
void sqlite3ExprAnalyzeAggregates(NameContext*, Expr*);
void sqlite3ExprAnalyzeAggList(NameContext*,ExprList*);