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Alternative fix to ticket [c8d3b9f0a750a529]: Prior to deleting or modifying

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an Expr not that is referenced by an AggInfo, modify the AggInfo to get its
own copy of the original Expr.

FossilOrigin-Name: 7682d8a768fbccfe0cc956e9f6481637146e1ab9763b248ff11052761ce32e32
This commit is contained in:
drh
2020-06-07 17:33:18 +00:00
parent a0365c487c
commit 896366282d
9 changed files with 276 additions and 23 deletions
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17
src/sqliteInt.h
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@@ -2506,11 +2506,11 @@ struct AggInfo {
ExprList *pGroupBy; /* The group by clause */
struct AggInfo_col { /* For each column used in source tables */
Table *pTab; /* Source table */
int iTable; /* Cursor number of the source table */
int iColumn; /* Column number within the source table */
int iSorterColumn; /* Column number in the sorting index */
int iMem; /* Memory location that acts as accumulator */
Expr *pExpr; /* The original expression */
int iTable; /* Cursor number of the source table */
int iMem; /* Memory location that acts as accumulator */
i16 iColumn; /* Column number within the source table */
i16 iSorterColumn; /* Column number in the sorting index */
} *aCol;
int nColumn; /* Number of used entries in aCol[] */
int nAccumulator; /* Number of columns that show through to the output.
@@ -2523,8 +2523,16 @@ struct AggInfo {
int iDistinct; /* Ephemeral table used to enforce DISTINCT */
} *aFunc;
int nFunc; /* Number of entries in aFunc[] */
#ifdef SQLITE_DEBUG
int iAggMagic; /* Magic number when valid */
#endif
};
/*
** Value for AggInfo.iAggMagic when the structure is valid
*/
#define AggInfoMagic 0x2059e99e
/*
** The datatype ynVar is a signed integer, either 16-bit or 32-bit.
** Usually it is 16-bits. But if SQLITE_MAX_VARIABLE_NUMBER is greater
@@ -4287,6 +4295,7 @@ int sqlite3ExprCompareSkip(Expr*, Expr*, int);
int sqlite3ExprListCompare(ExprList*, ExprList*, int);
int sqlite3ExprImpliesExpr(Parse*,Expr*, Expr*, int);
int sqlite3ExprImpliesNonNullRow(Expr*,int);
void sqlite3AggInfoPersistWalkerInit(Walker*,Parse*);
void sqlite3ExprAnalyzeAggregates(NameContext*, Expr*);
void sqlite3ExprAnalyzeAggList(NameContext*,ExprList*);
int sqlite3ExprCoveredByIndex(Expr*, int iCur, Index *pIdx);