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This experimental branch attempts to use columns for an index-on-expression

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in place of the expression that is being indexed.  This particular check-in
mostly works, but there are still issues.

FossilOrigin-Name: 2e8d4fd4cfd9e82f33c707ba246fe2bb3ca01762cf5ac5905058fbc7adf0abe7
This commit is contained in:
drh
2022-10-13 21:08:34 +00:00
parent d92c652ac1
commit 4bc1cc1847
10 changed files with 123 additions and 15 deletions
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20
src/sqliteInt.h
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@@ -1189,6 +1189,7 @@ typedef struct FuncDef FuncDef;
typedef struct FuncDefHash FuncDefHash;
typedef struct IdList IdList;
typedef struct Index Index;
typedef struct IndexExpr IndexExpr;
typedef struct IndexSample IndexSample;
typedef struct KeyClass KeyClass;
typedef struct KeyInfo KeyInfo;
@@ -2616,6 +2617,7 @@ struct Index {
unsigned bNoQuery:1; /* Do not use this index to optimize queries */
unsigned bAscKeyBug:1; /* True if the bba7b69f9849b5bf bug applies */
unsigned bHasVCol:1; /* Index references one or more VIRTUAL columns */
unsigned bHasExpr:1; /* This is an index on an expression */
#ifdef SQLITE_ENABLE_STAT4
int nSample; /* Number of elements in aSample[] */
int nSampleCol; /* Size of IndexSample.anEq[] and so on */
@@ -3563,6 +3565,23 @@ struct TriggerPrg {
# define DbMaskNonZero(M) (M)!=0
#endif
/*
** If there is an index on an expression in scope such that the value
** of the expression pExpr can be read out of the index with cursor iCur
** at column iCol, then an instance of this object records that fact.
**
** A linked list of these objects is attached to Parse and records all
** expressions that can be short-circuited by extracting a valid from
** an index.
*/
struct IndexExpr {
Expr *pExpr; /* The expression contained in the index */
int iDataCur; /* The data cursor associated with the index */
int iIdxCur; /* The index cursor */
int iIdxCol; /* The column of the index that contains pExpr */
IndexExpr *pIENext; /* Next in a list of all indexed expressions */
};
/*
** An instance of the ParseCleanup object specifies an operation that
** should be performed after parsing to deallocation resources obtained
@@ -3621,6 +3640,7 @@ struct Parse {
int nLabelAlloc; /* Number of slots in aLabel */
int *aLabel; /* Space to hold the labels */
ExprList *pConstExpr;/* Constant expressions */
IndexExpr *pIdxExpr; /* List of all expression in active indexes */
Token constraintName;/* Name of the constraint currently being parsed */
yDbMask writeMask; /* Start a write transaction on these databases */
yDbMask cookieMask; /* Bitmask of schema verified databases */