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Overview
| Comment: | On the ".scanstats on" output in the shell, initialize the estimated count for the first loop of each subquery to the actual loop count. |
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| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | scanstatus |
| Files: | files | file ages | folders |
| SHA1: |
d1c51c8455d5ce972a77720c2d562286 |
| User & Date: | drh 2014-11-06 12:17:24 |
Context
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2014-11-06
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| 12:46 | Further improvements to the ".scanstats on" display in the shell. Be sure to show the results of all subqueries even if there are gaps in the SELECTID values. Add ".scanstats" to the ".help" output. (Closed-Leaf check-in: ee922682 user: drh tags: scanstatus) | |
| 12:17 | On the ".scanstats on" output in the shell, initialize the estimated count for the first loop of each subquery to the actual loop count. (check-in: d1c51c84 user: drh tags: scanstatus) | |
| 12:08 | Changes the formatting of ".scanstats on" in the shell so that the stats for subqueries are grouped together and occur after the main query. (check-in: eacbbd88 user: drh tags: scanstatus) | |
Changes
Changes to src/shell.c.
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int iSid;
const char *zExplain;
if( sqlite3_stmt_scanstatus(p, i, SQLITE_SCANSTAT_NLOOP, (void*)&nLoop) ){
break;
}
sqlite3_stmt_scanstatus(p, i, SQLITE_SCANSTAT_SELECTID, (void*)&iSid);
if( iSid!=k ) continue;
if( n==0 && k>0 ) fprintf(pArg->out, "-------- subquery %d --------\n", k);
n++;
sqlite3_stmt_scanstatus(p, i, SQLITE_SCANSTAT_NVISIT, (void*)&nVisit);
sqlite3_stmt_scanstatus(p, i, SQLITE_SCANSTAT_EST, (void*)&rEst);
sqlite3_stmt_scanstatus(p, i, SQLITE_SCANSTAT_EXPLAIN, (void*)&zExplain);
fprintf(pArg->out, "Loop %2d: %s\n", n, zExplain);
rEstLoop *= rEst;
fprintf(pArg->out, " nLoop=%-8lld nRow=%-8lld estRow=%-8lld estRow/Loop=%-8g\n",
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> > | > |
1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 |
int iSid;
const char *zExplain;
if( sqlite3_stmt_scanstatus(p, i, SQLITE_SCANSTAT_NLOOP, (void*)&nLoop) ){
break;
}
sqlite3_stmt_scanstatus(p, i, SQLITE_SCANSTAT_SELECTID, (void*)&iSid);
if( iSid!=k ) continue;
if( n==0 ){
rEstLoop = (double)nLoop;
if( k>0 ) fprintf(pArg->out, "-------- subquery %d --------\n", k);
}
n++;
sqlite3_stmt_scanstatus(p, i, SQLITE_SCANSTAT_NVISIT, (void*)&nVisit);
sqlite3_stmt_scanstatus(p, i, SQLITE_SCANSTAT_EST, (void*)&rEst);
sqlite3_stmt_scanstatus(p, i, SQLITE_SCANSTAT_EXPLAIN, (void*)&zExplain);
fprintf(pArg->out, "Loop %2d: %s\n", n, zExplain);
rEstLoop *= rEst;
fprintf(pArg->out, " nLoop=%-8lld nRow=%-8lld estRow=%-8lld estRow/Loop=%-8g\n",
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