--- /dev/null
+#!/usr/bin/perl -w
+
+# $Id: test_estimation.pl 1631 2005-04-18 13:30:25Z strk $
+#
+# TODO:
+#
+# accept a finer boxesPerSide specification
+# eg. 1-3 or 1-32/5
+#
+
+use Pg;
+
+$VERBOSE = 0;
+
+sub usage
+{
+ local($me) = `basename $0`;
+ chop($me);
+ print STDERR "$me [-v] [-vacuum] [-bps <bps>[,<bps>]] <table> <col>\n";
+}
+
+$TABLE='';
+$COLUMN='';
+for ($i=0; $i<@ARGV; $i++)
+{
+ if ( $ARGV[$i] =~ m/^-/ )
+ {
+ if ( $ARGV[$i] eq '-v' )
+ {
+ $VERBOSE++;
+ }
+ elsif ( $ARGV[$i] eq '-bps' )
+ {
+ $bps_spec = $ARGV[++$i];
+ push(@bps_list, split(',', $bps_spec));
+ }
+ elsif ( $ARGV[$i] eq '-vacuum' )
+ {
+ $VACUUM=1;
+ }
+ else
+ {
+ print STDERR "Unknown option $ARGV[$i]:\n";
+ usage();
+ exit(1);
+ }
+ }
+ elsif ( ! $TABLE )
+ {
+ $TABLE = $ARGV[$i];
+ }
+ elsif ( ! $COLUMN )
+ {
+ $COLUMN = $ARGV[$i];
+ }
+ else
+ {
+ print STDERR "Too many options:\n";
+ usage();
+ exit(1);
+ }
+}
+
+if ( ! $TABLE || ! $COLUMN )
+{
+ usage();
+ exit 1;
+}
+
+
+$SCHEMA = 'public';
+$COLUMN = 'the_geom' if ( $COLUMN eq '' );
+if ( $TABLE =~ /(.*)\.(.*)/ )
+{
+ $SCHEMA = $1;
+ $TABLE = $2;
+}
+
+#connect
+$conn = Pg::connectdb("");
+if ( $conn->status != PGRES_CONNECTION_OK ) {
+ print STDERR $conn->errorMessage;
+ exit(1);
+}
+
+if ( $VERBOSE )
+{
+ print "Table: \"$SCHEMA\".\"$TABLE\"\n";
+ print "Column: \"$COLUMN\"\n";
+}
+
+
+# parse extent
+$ext{'xmin'} = -180;
+$ext{'ymin'} = -90;
+$ext{'xmax'} = 180;
+$ext{'ymax'} = 90;
+
+# vacuum analyze table
+if ( $VACUUM )
+{
+ print "VACUUM ANALYZE\n";
+ $query = 'vacuum analyze "'.$SCHEMA.'"."'.$TABLE.'"';
+ $res = $conn->exec($query);
+ if ( $res->resultStatus != PGRES_COMMAND_OK ) {
+ print STDERR $conn->errorMessage;
+ exit(1);
+ }
+}
+
+# get number of features from pg_class.ntuples
+# (correct if vacuum have been run after last insertion/deletions)
+$query = 'SELECT c.reltuples FROM pg_class c, pg_namespace n '.
+ "WHERE c.relnamespace = n.oid AND n.nspname = '$SCHEMA' ".
+ " AND c.relname = '$TABLE'";
+$res = $conn->exec($query);
+if ( $res->resultStatus != PGRES_TUPLES_OK ) {
+ print STDERR $conn->errorMessage;
+ exit(1);
+}
+$TOTROWS=$res->getvalue(0, 0);
+
+
+@extents = ( \%ext );
+
+#print " Type: $TYPE\n";
+print " Rows: $TOTROWS\n";
+
+print " bps\test\treal\tdelta\terror%\n";
+print "----------------------------------------------------------\n";
+
+for ($i=0; $i<@bps_list; $i++)
+{
+ $bps=$bps_list[$i];
+ @extents = split_extent(\%ext, $bps);
+
+ $best_error=0;
+ $worst_error=10000;
+ $sum_error=0;
+ $count_errors=0;
+ $try=0;
+ while ( ($cell_ext=pop(@extents)) )
+ {
+ ($est,$real) = test_extent($cell_ext);
+ $delta = $est-$real;
+
+ print " $bps\t".$est."\t".$real."\t$delta";
+
+ $error = $delta/$TOTROWS;
+ $count_errors++;
+
+ print "\t".(int(($error)*10000)/100)."\n";
+
+ $abs_error = abs($error);
+ $sum_error += $abs_error;
+ if ( $try == 0 || $abs_error > abs($worst_error) )
+ {
+ $worst_error = $error;
+ }
+ if ( $try == 0 || $abs_error < abs($best_error) )
+ {
+ $best_error = $error;
+ }
+ $try++;
+ }
+ $avg_error = $sum_error/$count_errors;
+ print " $bps\t".
+ "(best/worst/avg) \t".
+ (int($best_error*10000)/100)."\t".
+ (int($worst_error*10000)/100)."\t".
+ "+-".(int($avg_error*10000)/100)."\n";
+}
+
+
+##################################################################
+
+sub print_extent
+{
+ local($ext) = shift;
+ local($s);
+
+ $s = $ext->{'xmin'}." ".$ext->{'ymin'}." ";
+ $s .= $ext->{'xmax'}." ".$ext->{'ymax'};
+
+ return $s;
+}
+
+sub split_extent
+{
+ local($ext) = shift;
+ local($bps) = shift;
+
+ local($width, $height, $cell_width, $cell_height);
+ local($x,$y);
+ local(@stack);
+
+ $width = $ext->{'xmax'} - $ext->{'xmin'};
+ $height = $ext->{'ymax'} - $ext->{'ymin'};
+ $cell_width = $width / $bps;
+ $cell_height = $height / $bps;
+
+ if ($VERBOSE)
+ {
+ print "cell_w: $cell_width\n";
+ print "cell_h: $cell_height\n";
+ }
+
+ @stack = ();
+ for ($x=0; $x<$bps; $x++)
+ {
+ for($y=0; $y<$bps; $y++)
+ {
+ local(%cell);
+ $cell{'xmin'} = $ext->{'xmin'}+$x*$cell_width;
+ $cell{'ymin'} = $ext->{'ymin'}+$y*$cell_height;
+ $cell{'xmax'} = $ext->{'xmin'}+($x+1)*$cell_width;
+ $cell{'ymax'} = $ext->{'ymin'}+($y+1)*$cell_height;
+ print "cell: ".print_extent(\%cell)."\n" if ($VERBOSE);
+ push(@stack, \%cell);
+ }
+ }
+ return @stack;
+}
+
+sub test_extent
+{
+ local($ext) = shift;
+
+ # Test whole extent query
+ $query = 'explain analyze select 1 from "' . $SCHEMA . '"."' . $TABLE .'" WHERE "' . $COLUMN . '"' .
+ ' && ST_GeographyFromText(' . "'POLYGON((" .
+ $ext->{'xmin'} . " " . $ext->{'ymin'} . ", " .
+ $ext->{'xmin'} . " " . $ext->{'ymax'} . ", " .
+ $ext->{'xmax'} . " " . $ext->{'ymax'} . ", " .
+ $ext->{'xmax'} . " " . $ext->{'ymin'} . ", " .
+ $ext->{'xmin'} . " " . $ext->{'ymin'} .
+ "))')";
+
+ $res = $conn->exec($query);
+ if ( $res->resultStatus != PGRES_TUPLES_OK ) {
+ print STDERR $conn->errorMessage;
+ exit(1);
+ }
+ while ( ($row=$res->fetchrow()) )
+ {
+ next unless $row =~ /.* rows=([0-9]+) .* rows=([0-9]+) /;
+ $est = $1;
+ $real = $2;
+ last;
+ }
+
+ return ($est,$real);
+}
+
+#
+# $Log$
+# Revision 1.9 2005/04/18 13:30:25 strk
+# Fixed to work against LWGEOM installations
+#
+# Revision 1.8.4.1 2005/04/18 13:28:19 strk
+# Fixed to work against LWGEOM installations
+#
+# Revision 1.8 2004/03/08 17:21:57 strk
+# changed error computation code to delta/totrows
+#
+# Revision 1.7 2004/03/06 18:02:48 strk
+# Comma-separated bps values accepted
+#
+# Revision 1.6 2004/03/05 21:06:04 strk
+# Added -vacuum switch
+#
+# Revision 1.5 2004/03/05 21:03:18 strk
+# Made the -bps switch specify the exact level(s) at which to run the test
+#
+# Revision 1.4 2004/03/05 16:40:30 strk
+# rewritten split_extent to be more datatype-conservative
+#
+# Revision 1.3 2004/03/05 16:01:02 strk
+# added -bps switch to set maximun query level. reworked command line parsing
+#
+# Revision 1.2 2004/03/05 15:29:35 strk
+# more verbose output
+#
+# Revision 1.1 2004/03/05 11:52:24 strk
+# initial import
+#
+#
projects / postgis / commitdiff