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Add header comment for sqlite3_vtab_collation().

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FossilOrigin-Name: d238694ca445ccb4eeb3e3269a5f872f998f795945d0f9dd95c11d0e42d4d538
This commit is contained in:
dan
2017-04-15 14:30:01 +00:00
parent 79610f5d09
commit e01b9281fc
5 changed files with 39 additions and 14 deletions
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19
src/where.c
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@@ -3117,14 +3117,25 @@ static int whereLoopAddVirtualOne(
}
/*
** Context object used to pass information from whereLoopAddVirtual()
** to sqlite3_vtab_collation().
*/
struct BestIndexCtx {
WhereClause *pWC;
sqlite3_index_info *pIdxInfo;
Parse *pParse;
};
/*
** If this function is invoked from within an xBestIndex() callback, it
** returns a pointer to a buffer containing the name of the collation
** sequence associated with element iCons of the sqlite3_index_info.aConstraint
** array. Or, if iCons is out of range or there is no active xBestIndex
** call, return NULL.
*/
const char *sqlite3_vtab_collation(sqlite3 *db, int iCons){
struct BestIndexCtx *p = (struct BestIndexCtx*)db->pVtabWC;
struct BestIndexCtx *p = (struct BestIndexCtx*)db->pBestIndexCtx;
const char *zRet = 0;
if( p && iCons>=0 && iCons<p->pIdxInfo->nConstraint ){
int iTerm = p->pIdxInfo->aConstraint[iCons].iTermOffset;
@@ -3202,8 +3213,8 @@ static int whereLoopAddVirtual(
bic.pWC = pWC;
bic.pIdxInfo = p;
bic.pParse = pParse;
pSaved = pParse->db->pVtabWC;
pParse->db->pVtabWC = (void*)&bic;
pSaved = pParse->db->pBestIndexCtx;
pParse->db->pBestIndexCtx = (void*)&bic;
/* First call xBestIndex() with all constraints usable. */
WHERETRACE(0x40, (" VirtualOne: all usable\n"));
@@ -3281,7 +3292,7 @@ static int whereLoopAddVirtual(
if( p->needToFreeIdxStr ) sqlite3_free(p->idxStr);
sqlite3DbFreeNN(pParse->db, p);
pParse->db->pVtabWC = pSaved;
pParse->db->pBestIndexCtx = pSaved;
return rc;
}
#endif /* SQLITE_OMIT_VIRTUALTABLE */