Bug #11765749 58745: MTR SPENDS LONG TIME CHECKING FOR WARNINGS

Added code to look for repetitions and only repeat warnings once
Reduced time spent in check-warnings by almost 20% for full test suite

mysql-test/mysql-test-run.pl

@@ -4116,6 +4116,9 @@ sub extract_warning_lines ($$) {
     );
   my $skip_valgrind= 0;
 
+  my $last_pat= "";
+  my $num_rep= 0;
+
   foreach my $line ( @lines )
   {
     if ($opt_valgrind_mysqld) {
@@ -4130,11 +4133,29 @@ sub extract_warning_lines ($$) {
     {
       if ( $line =~ /$pat/ )
       {
+	# Remove initial timestamp and look for consecutive identical lines
+	my $line_pat= $line;
+	$line_pat =~ s/^[0-9: ]*//;
+	if ($line_pat eq $last_pat) {
+	  $num_rep++;
+	} else {
+	  # Previous line had been repeated, report that first
+	  if ($num_rep) {
+	    print $Fwarn ".... repeated $num_rep times: $last_pat";
+	    $num_rep= 0;
+	  }
+	  $last_pat= $line_pat;
 	  print $Fwarn $line;
+	}
 	last;
       }
     }
   }
+  # Catch the case of last warning being repeated
+  if ($num_rep) {
+    print $Fwarn ".... repeated $num_rep times: $last_pat";
+  }
+
   $Fwarn = undef; # Close file
 
 }