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Further comments on WITH-clause processing routines in select.c.

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FossilOrigin-Name: c948384dfdd9f68a832d5a452af44f35337f66e7
This commit is contained in:
drh
2014-01-15 18:35:52 +00:00
parent 60c1a2f0b5
commit c49832c208
4 changed files with 27 additions and 20 deletions
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13
src/select.c
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@@ -3482,9 +3482,9 @@ static int convertCompoundSelectToSubquery(Walker *pWalker, Select *p){
return WRC_Continue;
}
/* If the table identified by p is a transient table of
/* If the table identified by FROM clause element p is really
** a common-table-expression (CTE) then return a pointer to the
** CTE that defines table p. If p is not a CTE, then return NULL.
** CTE definition for that table.
*/
static struct Cte *searchWith(Parse *pParse, struct SrcList_item *p){
if( p->zDatabase==0 ){
@@ -3503,6 +3503,11 @@ static struct Cte *searchWith(Parse *pParse, struct SrcList_item *p){
return 0;
}
/* The code generator maintains a stack of active WITH clauses
** with the inner-most WITH clause being at the top of the stack.
**
** These routines push and pull WITH clauses on the stack.
*/
void sqlite3WithPush(Parse *pParse, With *pWith){
if( pWith ){
pWith->pOuter = pParse->pWith;
@@ -3516,6 +3521,9 @@ static void withPop(Parse *pParse, With *pWith){
}
}
/* Push or pull a CTE on the stack of all CTEs currently being
** coded.
*/
static int ctePush(Parse *pParse, struct Cte *pCte){
if( pCte ){
struct Cte *p;
@@ -3533,7 +3541,6 @@ static int ctePush(Parse *pParse, struct Cte *pCte){
}
return SQLITE_OK;
}
static void ctePop(Parse *pParse, struct Cte *pCte){
if( pCte ){
assert( pParse->pCte==pCte );