зеркало из https://github.com/mozilla/gecko-dev.git
Bug 245158: Combine multiple redundant LEFT JOINs into a single LEFT JOIN in Search.pm
r=zach,justdave a=justdave
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@ -980,6 +980,8 @@ sub init {
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# @supptables = Tables and/or table aliases used in query
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# %suppseen = A hash used to store all the tables in supptables to weed
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# out duplicates.
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# @supplist = A list used to accumulate all the JOIN clauses for each
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# chart to merge the ON sections of each.
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# $suppstring = String which is pasted into query containing all table names
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# get a list of field names to verify the user-submitted chart fields against
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@ -1061,15 +1063,25 @@ sub init {
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}
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my %suppseen = ("bugs" => 1);
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my $suppstring = "bugs";
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my @supplist = (" ");
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foreach my $str (@supptables) {
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if (!$suppseen{$str}) {
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if ($str !~ /^(LEFT|INNER) JOIN/i) {
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$suppstring .= ",";
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if ($str =~ /^(LEFT|INNER) JOIN/i) {
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$str =~ /^(.*?)\s+ON\s+(.*)$/i;
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my ($leftside, $rightside) = ($1, $2);
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if ($suppseen{$leftside}) {
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$supplist[$suppseen{$leftside}] .= " AND ($rightside)";
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} else {
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$suppseen{$leftside} = scalar @supplist;
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push @supplist, " $leftside ON ($rightside)";
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}
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} else {
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$suppstring .= ", $str";
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$suppseen{$str} = 1;
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}
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$suppstring .= " $str";
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$suppseen{$str} = 1;
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}
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}
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$suppstring .= join('', @supplist);
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# Make sure we create a legal SQL query.
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@andlist = ("1 = 1") if !@andlist;
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