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Comment: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.
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SHA1:ee922682bb7235dbcd23a22fcfdfa188f6d3228a
User & Date: drh 2014-11-06 12:46:16
Context
2014-11-06
14:43
Added SQLITE_SCANSTAT_SELECTID. Change the value returned by SQLITE_SCANSTAT_EST from sqlite3_int64 to double. Enhanced the formatting and display of scan statistics using the ".scanstats on" command in the shell. check-in: 20c7614a user: drh tags: trunk
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
Changes
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Changes to src/shell.c.

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** Display scan stats.
*/
static void display_scanstats(
  sqlite3 *db,                    /* Database to query */
  ShellState *pArg                /* Pointer to ShellState */
){
#ifdef SQLITE_ENABLE_STMT_SCANSTATUS
  int i, k, n = 1;
  fprintf(pArg->out, "-------- scanstats --------\n");

  for(k=0; n>0; k++){
    double rEstLoop = 1.0;
    for(i=n=0; 1; i++){
      sqlite3_stmt *p = pArg->pStmt;
      sqlite3_int64 nLoop, nVisit;
      double rEst;
      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",
          nLoop, nVisit, (sqlite3_int64)rEstLoop, rEst
      );
    }
  }
#else
  fprintf(pArg->out, "-------- scanstats --------\n");
  fprintf(pArg->out,
      "sqlite3_stmt_scanstatus() unavailable - "
      "rebuild with SQLITE_ENABLE_STMT_SCANSTATUS\n"
  );
#endif
  fprintf(pArg->out, "---------------------------\n");
}

/*
** Parameter azArray points to a zero-terminated array of strings. zStr
** points to a single nul-terminated string. Return non-zero if zStr
** is equal, according to strcmp(), to any of the strings in the array.
** Otherwise, return zero.
................................................................................
  ".output ?FILENAME?     Send output to FILENAME or stdout\n"
  ".print STRING...       Print literal STRING\n"
  ".prompt MAIN CONTINUE  Replace the standard prompts\n"
  ".quit                  Exit this program\n"
  ".read FILENAME         Execute SQL in FILENAME\n"
  ".restore ?DB? FILE     Restore content of DB (default \"main\") from FILE\n"
  ".save FILE             Write in-memory database into FILE\n"

  ".schema ?TABLE?        Show the CREATE statements\n"
  "                         If TABLE specified, only show tables matching\n"
  "                         LIKE pattern TABLE.\n"
  ".separator STRING ?NL? Change separator used by output mode and .import\n"
  "                         NL is the end-of-line mark for CSV\n"
  ".shell CMD ARGS...     Run CMD ARGS... in a system shell\n"
  ".show                  Show the current values for various settings\n"
................................................................................
    sqlite3_close(pSrc);
  }else


  if( c=='s' && strncmp(azArg[0], "scanstats", n)==0 ){
    if( nArg==2 ){
      p->scanstatsOn = booleanValue(azArg[1]);



    }else{
      fprintf(stderr, "Usage: .scanstats on|off\n");
      rc = 1;
    }
  }else

  if( c=='s' && strncmp(azArg[0], "schema", n)==0 ){







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** Display scan stats.
*/
static void display_scanstats(
  sqlite3 *db,                    /* Database to query */
  ShellState *pArg                /* Pointer to ShellState */
){
#ifdef SQLITE_ENABLE_STMT_SCANSTATUS
  int i, k, n, mx;
  fprintf(pArg->out, "-------- scanstats --------\n");
  mx = 0;
  for(k=0; k<=mx; k++){
    double rEstLoop = 1.0;
    for(i=n=0; 1; i++){
      sqlite3_stmt *p = pArg->pStmt;
      sqlite3_int64 nLoop, nVisit;
      double rEst;
      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>mx ) mx = 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",
          nLoop, nVisit, (sqlite3_int64)rEstLoop, rEst
      );
    }
  }

  fprintf(pArg->out, "---------------------------\n");




#endif

}

/*
** Parameter azArray points to a zero-terminated array of strings. zStr
** points to a single nul-terminated string. Return non-zero if zStr
** is equal, according to strcmp(), to any of the strings in the array.
** Otherwise, return zero.
................................................................................
  ".output ?FILENAME?     Send output to FILENAME or stdout\n"
  ".print STRING...       Print literal STRING\n"
  ".prompt MAIN CONTINUE  Replace the standard prompts\n"
  ".quit                  Exit this program\n"
  ".read FILENAME         Execute SQL in FILENAME\n"
  ".restore ?DB? FILE     Restore content of DB (default \"main\") from FILE\n"
  ".save FILE             Write in-memory database into FILE\n"
  ".scanstats on|off      Turn sqlite3_stmt_scanstatus() metrics on or off\n"
  ".schema ?TABLE?        Show the CREATE statements\n"
  "                         If TABLE specified, only show tables matching\n"
  "                         LIKE pattern TABLE.\n"
  ".separator STRING ?NL? Change separator used by output mode and .import\n"
  "                         NL is the end-of-line mark for CSV\n"
  ".shell CMD ARGS...     Run CMD ARGS... in a system shell\n"
  ".show                  Show the current values for various settings\n"
................................................................................
    sqlite3_close(pSrc);
  }else


  if( c=='s' && strncmp(azArg[0], "scanstats", n)==0 ){
    if( nArg==2 ){
      p->scanstatsOn = booleanValue(azArg[1]);
#ifndef SQLITE_ENABLE_STMT_SCANSTATUS
      fprintf(stderr, "Warning: .scanstats not available in this build.\n");
#endif
    }else{
      fprintf(stderr, "Usage: .scanstats on|off\n");
      rc = 1;
    }
  }else

  if( c=='s' && strncmp(azArg[0], "schema", n)==0 ){