116   explain_cursor *pCur;  in explainOpen()  local
117   pCur = sqlite3_malloc( sizeof(*pCur) );  in explainOpen()
118   if( pCur==0 ) return SQLITE_NOMEM;  in explainOpen()
119   memset(pCur, 0, sizeof(*pCur));  in explainOpen()
120   pCur->db = ((explain_vtab*)p)->db;  in explainOpen()
121   *ppCursor = &pCur->base;  in explainOpen()
129   explain_cursor *pCur = (explain_cursor*)cur;  in explainClose()  local
130   sqlite3_finalize(pCur->pExplain);  in explainClose()
131   sqlite3_free(pCur->zSql);  in explainClose()
132   sqlite3_free(pCur);  in explainClose()
141   explain_cursor *pCur = (explain_cursor*)cur;  in explainNext()  local
142   pCur->rc = sqlite3_step(pCur->pExplain);  in explainNext()
143   if( pCur->rc!=SQLITE_DONE && pCur->rc!=SQLITE_ROW ) return pCur->rc;  in explainNext()
156   explain_cursor *pCur = (explain_cursor*)cur;  in explainColumn()  local
158     sqlite3_result_text(ctx, pCur->zSql, -1, SQLITE_TRANSIENT);  in explainColumn()
160     sqlite3_result_value(ctx, sqlite3_column_value(pCur->pExplain, i));  in explainColumn()
170   explain_cursor *pCur = (explain_cursor*)cur;  in explainRowid()  local
171   *pRowid = sqlite3_column_int64(pCur->pExplain, 0);  in explainRowid()
180   explain_cursor *pCur = (explain_cursor*)cur;  in explainEof()  local
181   return pCur->rc!=SQLITE_ROW;  in explainEof()
197   explain_cursor *pCur = (explain_cursor *)pVtabCursor;  in explainFilter()  local
200   sqlite3_finalize(pCur->pExplain);  in explainFilter()
201   pCur->pExplain = 0;  in explainFilter()
203     pCur->rc = SQLITE_DONE;  in explainFilter()
206   sqlite3_free(pCur->zSql);  in explainFilter()
207   pCur->zSql = sqlite3_mprintf("%s", sqlite3_value_text(argv[0]));  in explainFilter()
208   if( pCur->zSql ){  in explainFilter()
209     zSql = sqlite3_mprintf("EXPLAIN %s", pCur->zSql);  in explainFilter()
214     rc = sqlite3_prepare_v2(pCur->db, zSql, -1, &pCur->pExplain, 0);  in explainFilter()
218     sqlite3_finalize(pCur->pExplain);  in explainFilter()
219     pCur->pExplain = 0;  in explainFilter()
220     sqlite3_free(pCur->zSql);  in explainFilter()
221     pCur->zSql = 0;  in explainFilter()
223     pCur->rc = sqlite3_step(pCur->pExplain);  in explainFilter()
224     rc = (pCur->rc==SQLITE_DONE || pCur->rc==SQLITE_ROW) ? SQLITE_OK : pCur->rc;  in explainFilter()