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Refactor the sqlite3BtreeCursorHint() interface for improved maintainability.

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FossilOrigin-Name: fc3fb5cd0d2c123a069e5b18b62bb1f708c8698a
This commit is contained in:
drh
2015-08-14 15:05:55 +00:00
parent fe66352d17
commit 0df57012da
6 changed files with 90 additions and 43 deletions
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40
src/btree.c
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@@ -839,16 +839,32 @@ int sqlite3BtreeCursorRestore(BtCursor *pCur, int *pDifferentRow){
#ifdef SQLITE_ENABLE_CURSOR_HINTS
/*
** Give a hint to the cursor that it only has to deliver rows for which
** the expression pExpr is true. Within this expression, rows of the
** cursor are identified by Expr.op==TK_COLUMN with Expr.iTable==iTable.
** Provide hints to the cursor. The particular hint given (and the type
** and number of the varargs parameters) is determined by the eHintType
** parameter. See the definitions of the BTREE_HINT_* macros for details.
**
** This interfaces is not used by the standard storage engine of SQLite.
** It is only useful to application that replace SQLite's built-in storage
** engine with their own.
** Hints are not (currently) used by the native SQLite implementation.
** This mechanism is provided for systems that substitute an alternative
** storage engine.
*/
void sqlite3BtreeCursorHint(BtCursor *pCur, int iTable, const Expr *pExpr){
/* Alternative storage engines might use this. */
void sqlite3BtreeCursorHint(BtCursor *pCur, int eHintType, ...){
va_list ap;
va_start(ap, eHintType);
switch( eHintType ){
case BTREE_HINT_FLAGS: {
pCur->hints = va_arg(ap, unsigned int);
assert( pCur->hints==BTREE_SEEK_EQ || pCur->hints==BTREE_BULKLOAD
|| pCur->hints==0 );
break;
}
case BTREE_HINT_RANGE: {
(void)va_arg(ap, Expr*);
(void)va_arg(ap, struct Mem*);
/* Range expression not used in this implementation */
break;
}
}
va_end(ap);
}
#endif /* SQLITE_ENABLE_CURSOR_HINTS */
@@ -9564,14 +9580,6 @@ int sqlite3BtreeSetVersion(Btree *pBtree, int iVersion){
return rc;
}
/*
** set the mask of hint flags for cursor pCsr.
*/
void sqlite3BtreeCursorHints(BtCursor *pCsr, unsigned int mask){
assert( mask==BTREE_BULKLOAD || mask==BTREE_SEEK_EQ || mask==0 );
pCsr->hints = mask;
}
#ifdef SQLITE_DEBUG
/*
** Return true if the cursor has a hint specified. This routine is