320 lines
6.3 KiB
Perl
Executable File
320 lines
6.3 KiB
Perl
Executable File
#!/usr/bin/env perl
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#
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# TODO:
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#
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# accept a finer boxesPerSide specification
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# eg. 1-3 or 1-32/5
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#
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use warnings;
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use Pg;
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$VERBOSE = 0;
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sub usage
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{
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local($me) = `basename $0`;
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chop($me);
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print STDERR "$me [-v] [-vacuum] [-bps <bps>[,<bps>]] <table> <col>\n";
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}
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$TABLE='';
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$COLUMN='';
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for ($i=0; $i<@ARGV; $i++)
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{
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if ( $ARGV[$i] =~ m/^-/ )
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{
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if ( $ARGV[$i] eq '-v' )
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{
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$VERBOSE++;
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}
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elsif ( $ARGV[$i] eq '-bps' )
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{
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$bps_spec = $ARGV[++$i];
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push(@bps_list, split(',', $bps_spec));
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}
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elsif ( $ARGV[$i] eq '-vacuum' )
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{
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$VACUUM=1;
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}
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else
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{
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print STDERR "Unknown option $ARGV[$i]:\n";
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usage();
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exit(1);
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}
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}
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elsif ( ! $TABLE )
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{
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$TABLE = $ARGV[$i];
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}
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elsif ( ! $COLUMN )
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{
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$COLUMN = $ARGV[$i];
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}
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else
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{
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print STDERR "Too many options:\n";
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usage();
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exit(1);
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}
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}
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if ( ! $TABLE || ! $COLUMN )
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{
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usage();
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exit 1;
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}
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$SCHEMA = 'public';
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$COLUMN = 'the_geom' if ( $COLUMN eq '' );
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if ( $TABLE =~ /(.*)\.(.*)/ )
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{
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$SCHEMA = $1;
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$TABLE = $2;
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}
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#connect
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$conn = Pg::connectdb("");
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if ( $conn->status != PGRES_CONNECTION_OK ) {
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print STDERR $conn->errorMessage;
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exit(1);
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}
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if ( $VERBOSE )
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{
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print "Table: \"$SCHEMA\".\"$TABLE\"\n";
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print "Column: \"$COLUMN\"\n";
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}
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# Get extent
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$query = 'select extent("'.$COLUMN.'"), min(geometrytype("'.$COLUMN.'")) from "'.$SCHEMA.'"."'.$TABLE.'"';
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$res = $conn->exec($query);
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if ( $res->resultStatus != PGRES_TUPLES_OK ) {
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print STDERR $conn->errorMessage;
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exit(1);
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}
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$TYPE = $res->getvalue(0, 1);
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$EXTENT = $res->getvalue(0, 0);
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# find srid
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$query = 'select srid("'.$COLUMN.'") from "'.$SCHEMA.'"."'.$TABLE.'"';
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$res = $conn->exec($query);
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if ( $res->resultStatus != PGRES_TUPLES_OK ) {
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print STDERR $conn->errorMessage;
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exit(1);
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}
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$SRID = $res->getvalue(0, 0);
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# parse extent
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if ( $EXTENT =~ /^BOX3D\((.*) (.*) (.*),(.*) (.*) (.*)\)$/ )
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{
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$ext{xmin} = $1;
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$ext{ymin} = $2;
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$ext{xmax} = $4;
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$ext{ymax} = $5;
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}
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elsif ( $EXTENT =~ /^BOX\((.*) (.*),(.*) (.*)\)$/ )
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{
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$ext{xmin} = $1;
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$ext{ymin} = $2;
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$ext{xmax} = $3;
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$ext{ymax} = $4;
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}
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else
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{
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print STDERR "Couldn't parse EXTENT: $EXTENT\n";
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exit(1);
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}
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# vacuum analyze table
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if ( $VACUUM )
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{
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print "VACUUM ANALYZE\n";
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$query = 'vacuum analyze "'.$SCHEMA.'"."'.$TABLE.'"';
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$res = $conn->exec($query);
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if ( $res->resultStatus != PGRES_COMMAND_OK ) {
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print STDERR $conn->errorMessage;
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exit(1);
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}
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}
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# get number of features from pg_class.ntuples
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# (correct if vacuum have been run after last insertion/deletions)
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$query = 'SELECT c.reltuples FROM pg_class c, pg_namespace n '.
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"WHERE c.relnamespace = n.oid AND n.nspname = '$SCHEMA' ".
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" AND c.relname = '$TABLE'";
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$res = $conn->exec($query);
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if ( $res->resultStatus != PGRES_TUPLES_OK ) {
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print STDERR $conn->errorMessage;
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exit(1);
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}
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$TOTROWS=$res->getvalue(0, 0);
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@extents = ( \%ext );
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print " Type: $TYPE\n";
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print " Rows: $TOTROWS\n";
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print "Extent: ".print_extent(\%ext)."\n" if ($VERBOSE);
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print " bps\test\treal\tdelta\terror%\n";
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print "----------------------------------------------------------\n";
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for ($i=0; $i<@bps_list; $i++)
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{
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$bps=$bps_list[$i];
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@extents = split_extent(\%ext, $bps);
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$best_error=0;
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$worst_error=10000;
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$sum_error=0;
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$count_errors=0;
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$try=0;
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while ( ($cell_ext=pop(@extents)) )
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{
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($est,$real) = test_extent($cell_ext);
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$delta = $est-$real;
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print " $bps\t".$est."\t".$real."\t$delta";
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$error = $delta/$TOTROWS;
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$count_errors++;
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print "\t".(int(($error)*10000)/100)."\n";
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$abs_error = abs($error);
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$sum_error += $abs_error;
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if ( $try == 0 || $abs_error > abs($worst_error) )
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{
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$worst_error = $error;
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}
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if ( $try == 0 || $abs_error < abs($best_error) )
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{
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$best_error = $error;
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}
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$try++;
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}
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$avg_error = $sum_error/$count_errors;
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print " $bps\t".
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"(best/worst/avg) \t".
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(int($best_error*10000)/100)."\t".
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(int($worst_error*10000)/100)."\t".
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"+-".(int($avg_error*10000)/100)."\n";
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}
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##################################################################
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sub print_extent
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{
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local($ext) = shift;
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local($s);
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$s = $ext->{'xmin'}." ".$ext->{'ymin'}." ";
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$s .= $ext->{'xmax'}." ".$ext->{'ymax'};
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return $s;
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}
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sub split_extent
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{
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local($ext) = shift;
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local($bps) = shift;
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local($width, $height, $cell_width, $cell_height);
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local($x,$y);
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local(@stack);
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$width = $ext->{'xmax'} - $ext->{'xmin'};
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$height = $ext->{'ymax'} - $ext->{'ymin'};
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$cell_width = $width / $bps;
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$cell_height = $height / $bps;
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if ($VERBOSE)
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{
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print "cell_w: $cell_width\n";
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print "cell_h: $cell_height\n";
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}
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@stack = ();
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for ($x=0; $x<$bps; $x++)
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{
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for($y=0; $y<$bps; $y++)
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{
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local(%cell);
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$cell{'xmin'} = $ext->{'xmin'}+$x*$cell_width;
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$cell{'ymin'} = $ext->{'ymin'}+$y*$cell_height;
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$cell{'xmax'} = $ext->{'xmin'}+($x+1)*$cell_width;
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$cell{'ymax'} = $ext->{'ymin'}+($y+1)*$cell_height;
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print "cell: ".print_extent(\%cell)."\n" if ($VERBOSE);
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push(@stack, \%cell);
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}
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}
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return @stack;
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}
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sub test_extent
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{
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local($ext) = shift;
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# Test whole extent query
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$query = 'explain analyze select 1 from "'.
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$SCHEMA.'"."'.$TABLE.'" WHERE "'.$COLUMN.'" && '.
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"setSRID('BOX3D(".$ext->{'xmin'}." ".
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$ext->{'ymin'}.", ".$ext->{'xmax'}." ".
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$ext->{'ymax'}.")'::BOX3D, $SRID)";
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$res = $conn->exec($query);
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if ( $res->resultStatus != PGRES_TUPLES_OK ) {
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print STDERR $conn->errorMessage;
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exit(1);
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}
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while ( ($row=$res->fetchrow()) )
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{
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next unless $row =~ /.* rows=([0-9]+) .* rows=([0-9]+) /;
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$est = $1;
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$real = $2;
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last;
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}
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return ($est,$real);
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}
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#
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# $Log$
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# Revision 1.9 2005/04/18 13:30:25 strk
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# Fixed to work against LWGEOM installations
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#
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# Revision 1.8.4.1 2005/04/18 13:28:19 strk
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# Fixed to work against LWGEOM installations
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#
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# Revision 1.8 2004/03/08 17:21:57 strk
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# changed error computation code to delta/totrows
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#
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# Revision 1.7 2004/03/06 18:02:48 strk
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# Comma-separated bps values accepted
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#
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# Revision 1.6 2004/03/05 21:06:04 strk
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# Added -vacuum switch
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#
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# Revision 1.5 2004/03/05 21:03:18 strk
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# Made the -bps switch specify the exact level(s) at which to run the test
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#
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# Revision 1.4 2004/03/05 16:40:30 strk
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# rewritten split_extent to be more datatype-conservative
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#
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# Revision 1.3 2004/03/05 16:01:02 strk
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# added -bps switch to set maximun query level. reworked command line parsing
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#
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# Revision 1.2 2004/03/05 15:29:35 strk
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# more verbose output
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#
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# Revision 1.1 2004/03/05 11:52:24 strk
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# initial import
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#
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#
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