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Further improvements to the ".scanstats on" display in the shell. Be sure

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to show the results of all subqueries even if there are gaps in the 
SELECTID values.  Add ".scanstats" to the ".help" output.

FossilOrigin-Name: ee922682bb7235dbcd23a22fcfdfa188f6d3228a
This commit is contained in:
drh
2014-11-06 12:46:16 +00:00
parent 179bac3a14
commit 15f23c2cf0
3 changed files with 17 additions and 17 deletions
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20
src/shell.c
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@@ -1194,9 +1194,10 @@ static void display_scanstats(
ShellState *pArg /* Pointer to ShellState */
){
#ifdef SQLITE_ENABLE_STMT_SCANSTATUS
int i, k, n = 1;
int i, k, n, mx;
fprintf(pArg->out, "-------- scanstats --------\n");
for(k=0; n>0; k++){
mx = 0;
for(k=0; k<=mx; k++){
double rEstLoop = 1.0;
for(i=n=0; 1; i++){
sqlite3_stmt *p = pArg->pStmt;
@@ -1208,10 +1209,11 @@ static void display_scanstats(
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);
if( k>0 ) fprintf(pArg->out, "-------- subquery %d -------\n", k);
}
n++;
sqlite3_stmt_scanstatus(p, i, SQLITE_SCANSTAT_NVISIT, (void*)&nVisit);
@@ -1224,14 +1226,8 @@ static void display_scanstats(
);
}
}
#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");
#endif
}
/*
@@ -1687,6 +1683,7 @@ static char zHelp[] =
".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"
@@ -3072,6 +3069,9 @@ static int do_meta_command(char *zLine, ShellState *p){
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;