sqliteLocateTable
pTab = sqliteLocateTable(pParse, zTab, zDb);
sqliteLocateTable(pParse,pTabList->a[i].zName,pTabList->a[i].zDatabase);
Table *sqliteLocateTable(Parse*,const char*, const char*);
pTab = sqliteLocateTable(pParse, nt->table, db->aDb[nt->iTabDb].zName);