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#!/usr/bin/perl
# Copyright (c) 2021, PostgreSQL Global Development Group
use strict;
use warnings;
# make sure we are in a sane environment.
use DBI();
use DBD::Pg();
use Time::HiRes qw( usleep ualarm gettimeofday tv_interval );
use Getopt::Std;
my %opt;
getopts('d:b:s:veorauc', \%opt);
if (!(scalar %opt && defined $opt{s}))
{
print <<EOT;
Usage:
$0 -d DATABASE -s SECTIONS [-b NUMBER] [-v] [-e] [-o] [-r] [-a] [-u]
-d DATABASE -DATABASE
-b NUMBER -number of repeats
-s SECTIONS -sections, format sid1[,sid2[,sid3[...]]]]
-v -verbose (show SQL)
-e -show explain
-r -use RD-tree index
-a -AND section
-o -show output
-u -unique
-c -count
EOT
exit;
}
$opt{d} ||= '_int4';
my $dbi = DBI->connect('DBI:Pg:dbname=' . $opt{d});
my %table;
my @where;
$table{message} = 1;
if ($opt{a})
{
if ($opt{r})
{
push @where, "message.sections @ '{$opt{s}}'";
}
else
{
foreach my $sid (split(/[,\s]+/, $opt{s}))
{
push @where, "message.mid = msp$sid.mid";
push @where, "msp$sid.sid = $sid";
$table{"message_section_map msp$sid"} = 1;
}
}
}
else
{
if ($opt{r})
{
push @where, "message.sections && '{$opt{s}}'";
}
else
{
$table{message_section_map} = 1;
push @where, "message.mid = message_section_map.mid";
push @where, "message_section_map.sid in ($opt{s})";
}
}
my $outf;
if ($opt{c})
{
$outf =
($opt{u}) ? 'count( distinct message.mid )' : 'count( message.mid )';
}
else
{
$outf = ($opt{u}) ? 'distinct( message.mid )' : 'message.mid';
}
my $sql =
"select $outf from "
. join(', ', keys %table)
. " where "
. join(' AND ', @where) . ';';
if ($opt{v})
{
print "$sql\n";
}
if ($opt{e})
{
my @plan =
map { "$_->[0]\n" } @{ $dbi->selectall_arrayref("explain $sql") };
print @plan;
}
my $t0 = [gettimeofday];
my $count = 0;
my $b = $opt{b};
$b ||= 1;
my @a;
foreach (1 .. $b)
{
@a = exec_sql($dbi, $sql);
$count = $#a;
}
my $elapsed = tv_interval($t0, [gettimeofday]);
if ($opt{o})
{
foreach (@a)
{
print "$_->{mid}\t$_->{sections}\n";
}
}
print sprintf(
"total: %.02f sec; number: %d; for one: %.03f sec; found %d docs\n",
$elapsed, $b, $elapsed / $b,
$count + 1);
$dbi->disconnect;
sub exec_sql
{
my ($dbi, $sql, @keys) = @_;
my $sth = $dbi->prepare($sql) || die;
$sth->execute(@keys) || die;
my $r;
my @row;
while (defined($r = $sth->fetchrow_hashref))
{
push @row, $r;
}
$sth->finish;
return @row;
}
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