--- /dev/null
+#!/usr/bin/perl -w
+
+# $Id$
+#
+# 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 "$me [-v] [-vacuum] <table1> <col1> <table2> <col2>\n";
+}
+
+$TABLE1='';
+$TABLE2='';
+$COLUMN1='';
+$COLUMN2='';
+for ($i=0; $i<@ARGV; $i++)
+{
+ if ( $ARGV[$i] =~ m/^-/ )
+ {
+ if ( $ARGV[$i] eq '-v' )
+ {
+ $VERBOSE++;
+ }
+ elsif ( $ARGV[$i] eq '-vacuum' )
+ {
+ $VACUUM=1;
+ }
+ else
+ {
+ print STDERR "Unknown option $ARGV[$i]:\n";
+ usage();
+ exit(1);
+ }
+ }
+ elsif ( ! $TABLE1 )
+ {
+ $TABLE1 = $ARGV[$i];
+ }
+ elsif ( ! $TABLE2 )
+ {
+ $TABLE2 = $ARGV[$i];
+ }
+ elsif ( ! $COLUMN1 )
+ {
+ $COLUMN1 = $ARGV[$i];
+ }
+ elsif ( ! $COLUMN2 )
+ {
+ $COLUMN2 = $ARGV[$i];
+ }
+ else
+ {
+ print STDERR "Too many options:\n";
+ usage();
+ exit(1);
+ }
+}
+
+if ( ! $TABLE1 || ! $TABLE2 )
+{
+ usage();
+ exit 1;
+}
+
+
+$SCHEMA1 = 'public';
+$COLUMN1 = 'the_geom' if ( $COLUMN1 eq '' );
+if ( $TABLE1 =~ /(.*)\.(.*)/ )
+{
+ $SCHEMA1 = $1;
+ $TABLE1 = $2;
+}
+$SCHEMA2 = 'public';
+$COLUMN2 = 'the_geom' if ( $COLUMN2 eq '' );
+if ( $TABLE2 =~ /(.*)\.(.*)/ )
+{
+ $SCHEMA1 = $1;
+ $TABLE1 = $2;
+}
+
+#connect
+$conn = Pg::connectdb("");
+if ( $conn->status != PGRES_CONNECTION_OK ) {
+ print STDERR $conn->errorMessage;
+ exit(1);
+}
+
+if ( $VERBOSE )
+{
+ print "Table1: \"$SCHEMA1\".\"$TABLE1\".\"$COLUMN1\"\n";
+ print "Table2: \"$SCHEMA2\".\"$TABLE2\".\"$COLUMN2\"\n";
+}
+
+# Get geometry types
+
+$TYPE1 = get_geometry_type($SCHEMA1, $TABLE1, $COLUMN1);
+$TYPE2 = get_geometry_type($SCHEMA2, $TABLE2, $COLUMN2);
+
+# vacuum analyze table
+if ( $VACUUM )
+{
+ print "VACUUM ANALYZE\n";
+ vacuum($SCHEMA1, $TABLE1);
+ vacuum($SCHEMA2, $TABLE2);
+}
+
+# get number of features from pg_class.ntuples
+# (correct if vacuum have been run after last insertion/deletions)
+$NROWS1 = get_num_rows($SCHEMA1, $TABLE1);
+$NROWS2 = get_num_rows($SCHEMA2, $TABLE2);
+$TOTROWS = $NROWS1*$NROWS2;
+
+
+# Test join selectivity
+
+($est,$real) = test_join();
+$delta = $est-$real;
+$error = $delta/$TOTROWS;
+$error = int(($error)*10000)/100;
+
+print " Types: $TYPE1 - $TYPE2\n";
+print " Rows: $NROWS1 x $NROWS2 = $TOTROWS\n";
+print " Estimated: ".$est."\n";
+print " Real: ".$real."\n";
+print " Error: ".$error."%\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_join
+{
+ local($ext) = shift;
+
+ # Test whole extent query
+ $query = 'explain analyze select * from "'.
+ $SCHEMA1.'"."'.$TABLE1.'" t1, "'.$SCHEMA2.'"."'.$TABLE2.
+ '" t2 WHERE t1."'.$COLUMN1.'" && '.
+ ' t2."'.$COLUMN2.'"';
+ print $query."\n";
+ $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);
+}
+
+sub get_geometry_type
+{
+ my $schema = shift;
+ my $table = shift;
+ my $col = shift;
+ my $query = 'select distinct geometrytype("'.$col.'") from "'.$schema.'"."'.$table.'"';
+ my $res = $conn->exec($query);
+ if ( $res->resultStatus != PGRES_TUPLES_OK ) {
+ print STDERR $conn->errorMessage;
+ exit(1);
+ }
+ if ( $res->ntuples() > 1 ) {
+ print STDERR "Mixed geometry types in \"$SCHEMA1\".\"$TABLE1\".\"$COLUMN1\"\n";
+ exit(1);
+ }
+ return $res->getvalue(0, 0);
+}
+
+sub vacuum
+{
+ my $SCHEMA = shift;
+ my $TABLE = shift;
+ my $query = 'vacuum analyze "'.$SCHEMA.'"."'.$TABLE.'"';
+ my $res = $conn->exec($query);
+ if ( $res->resultStatus != PGRES_COMMAND_OK ) {
+ print STDERR $conn->errorMessage;
+ exit(1);
+ }
+}
+
+sub get_num_rows
+{
+ my $SCHEMA = shift;
+ my $TABLE = shift;
+ my $query = 'SELECT c.reltuples FROM pg_class c, pg_namespace n '.
+ "WHERE c.relnamespace = n.oid AND n.nspname = '$SCHEMA' ".
+ " AND c.relname = '$TABLE'";
+ my $res = $conn->exec($query);
+ if ( $res->resultStatus != PGRES_TUPLES_OK ) {
+ print STDERR $conn->errorMessage;
+ exit(1);
+ }
+ return $res->getvalue(0, 0);
+}
+
+#
+# $Log$
+# Revision 1.1 2004/12/22 17:02:17 strk
+# initial revision
+#
+# 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