database/sqlite
1
0
Fork 0
mirror of https://github.com/sqlite/sqlite.git synced 2025-11-12 13:01:09 +03:00
Code Activity

Optimizations to the Walker object and its methods to make the code a little

Browse Source 
smaller and to help it run a little faster.

FossilOrigin-Name: 6854a34ed708259f2280f7ee56cec09f7fc99810dc739dc2814ddeae286aa2c4
This commit is contained in:
drh
2017-05-29 14:26:07 +00:00
parent d8a295669c
commit 979dd1be57
7 changed files with 61 additions and 38 deletions
Download Patch File Download Diff File Expand all files Collapse all files

23
src/select.c
View File

@@ -4610,6 +4610,25 @@ int sqlite3ExprWalkNoop(Walker *NotUsed, Expr *NotUsed2){
return WRC_Continue;
}
/*
** No-op routine for the parse-tree walker for SELECT statements.
** subquery in the parser tree.
*/
int sqlite3SelectWalkNoop(Walker *NotUsed, Select *NotUsed2){
UNUSED_PARAMETER2(NotUsed, NotUsed2);
return WRC_Continue;
}
#if SQLITE_DEBUG
/*
** Always assert. This xSelectCallback2 implementation proves that the
** xSelectCallback2 is never invoked.
*/
void sqlite3SelectWalkAssert2(Walker *NotUsed, Select *NotUsed2){
UNUSED_PARAMETER2(NotUsed, NotUsed2);
assert( 0 );
}
#endif
/*
** This routine "expands" a SELECT statement and all of its subqueries.
** For additional information on what it means to "expand" a SELECT
@@ -4625,11 +4644,11 @@ int sqlite3ExprWalkNoop(Walker *NotUsed, Expr *NotUsed2){
*/
static void sqlite3SelectExpand(Parse *pParse, Select *pSelect){
Walker w;
memset(&w, 0, sizeof(w));
w.xExprCallback = sqlite3ExprWalkNoop;
w.pParse = pParse;
if( pParse->hasCompound ){
w.xSelectCallback = convertCompoundSelectToSubquery;
w.xSelectCallback2 = 0;
sqlite3WalkSelect(&w, pSelect);
}
w.xSelectCallback = selectExpander;
@@ -4689,7 +4708,7 @@ static void selectAddSubqueryTypeInfo(Walker *pWalker, Select *p){
static void sqlite3SelectAddTypeInfo(Parse *pParse, Select *pSelect){
#ifndef SQLITE_OMIT_SUBQUERY
Walker w;
memset(&w, 0, sizeof(w));
w.xSelectCallback = sqlite3SelectWalkNoop;
w.xSelectCallback2 = selectAddSubqueryTypeInfo;
w.xExprCallback = sqlite3ExprWalkNoop;
w.pParse = pParse;