Fixed bug in LEFT JOIN

Docs/manual.texi:
  ChangeLog
myisam/mi_locking.c:
  Remove wrong optimistic locking. (Doesn't affect MySQL)
mysys/my_init.c:
  Release character sets at end
scripts/mysqlhotcopy.sh:
  RAID tables are now copied

Docs/manual.texi

@@ -46784,6 +46784,7 @@ users use this code as the rest of the code and because of this we are
 not yet 100% confident in this code.
 
 @menu
+* News-3.23.47::                
 * News-3.23.46::                Changes in release 3.23.46
 * News-3.23.45::                Changes in release 3.23.45
 * News-3.23.44::                Changes in release 3.23.44
@@ -46834,7 +46835,13 @@ not yet 100% confident in this code.
 * News-3.23.0::                 Changes in release 3.23.0
 @end menu
 
-@node News-3.23.46, News-3.23.45, News-3.23.x, News-3.23.x
+@node News-3.23.47, News-3.23.46, News-3.23.x, News-3.23.x
+@appendixsubsec Changes in release 3.23.46
+@itemize @bullet
+Fixed bug when using @code{t1 LEFT JOIN t2 ON t2.key=constant}.
+@end itemize
+
+@node News-3.23.46, News-3.23.45, News-3.23.47, News-3.23.x
 @appendixsubsec Changes in release 3.23.46
 @itemize @bullet
 @item

myisam/mi_locking.c

@@ -303,7 +303,6 @@ int _mi_readinfo(register MI_INFO *info, int lock_type, int check_keybuffer)
   {
     if (!share->r_locks && !share->w_locks)
     {
-      if ((info->tmp_lock_type=lock_type) != F_RDLCK)
       if (my_lock(share->kfile,lock_type,0L,F_TO_EOF,
 		  info->lock_wait | MY_SEEK_NOT_DONE))
 	DBUG_RETURN(1);

mysql-test/r/join_outer.result

@@ -320,3 +320,14 @@ id	name	id	idx
 2	no	NULL	NULL
 bug_id	reporter	bug_id	who
 1	1	1	2
+table	type	possible_keys	key	key_len	ref	rows	Extra
+t2	index	NULL	PRIMARY	4	NULL	3	Using index
+t1	eq_ref	PRIMARY	PRIMARY	2	const	1	where used; Using index
+fooID	barID	fooID
+10	1	NULL
+20	2	NULL
+30	3	30
+fooID	barID	fooID
+10	1	NULL
+20	2	NULL
+30	3	30

mysql-test/t/join_outer.test

@@ -404,3 +404,15 @@ insert into t2 values (1,1),(1,2);
 insert into t1 values (1,1),(2,1);
 SELECT * FROM t1 LEFT JOIN t2 ON (t1.bug_id =  t2.bug_id AND  t2.who = 2) WHERE  (t1.reporter = 2 OR t2.who = 2);
 drop table t1,t2;
+
+#
+# Test problem with LEFT JOIN
+
+create table t1 (fooID smallint unsigned auto_increment, primary key (fooID));
+create table t2 (fooID smallint unsigned not null, barID smallint unsigned not null, primary key (fooID,barID));
+insert into t1 (fooID) values (10),(20),(30);
+insert into t2 values (10,1),(20,2),(30,3);
+explain select * from t2 left join t1 on t1.fooID = t2.fooID and t1.fooID = 30;
+select * from t2 left join t1 on t1.fooID = t2.fooID and t1.fooID = 30;
+select * from t2 left join t1 ignore index(primary) on t1.fooID = t2.fooID and t1.fooID = 30;
+drop table t1,t2;

mysys/my_init.c

@@ -126,6 +126,7 @@ void my_end(int infoflag)
       DBUG_PRINT("error",("%s",errbuff[0]));
     }
   }
+  free_charsets();
   if (infoflag & MY_GIVE_INFO || info_file != stderr)
   {
 #ifdef HAVE_GETRUSAGE
@@ -150,7 +151,6 @@ Voluntary context switches %ld, Involuntary context switches %ld\n",
 #if defined(MSDOS) && !defined(__WIN__)
     fprintf(info_file,"\nRun time: %.1f\n",(double) clock()/CLOCKS_PER_SEC);
 #endif
-    free_charsets();
 #if defined(SAFEMALLOC)
     TERMINATE(stderr);		/* Give statistic on screen */
 #elif defined(__WIN__) && defined(_MSC_VER)

scripts/mysqlhotcopy.sh

@@ -37,7 +37,7 @@ WARNING: THIS PROGRAM IS STILL IN BETA. Comments/patches welcome.
 
 # Documentation continued at end of file
 
-my $VERSION = "1.13";
+my $VERSION = "1.14";
 
 my $opt_tmpdir = $ENV{TMPDIR} || "/tmp";
 
@@ -120,6 +120,7 @@ GetOptions( \%opt,
 #   'target'  - destination directory of the copy
 #   'tables'  - array-ref to list of tables in the db
 #   'files'   - array-ref to list of files to be copied
+#               (RAID files look like 'nn/name.MYD')
 #   'index'   - array-ref to list of indexes to be copied
 #
 
@@ -265,11 +266,23 @@ foreach my $rdb ( @db_desc ) {
       or die "Cannot open dir '$db_dir': $!";
 
     my %db_files;
-    map { ( /(.+)\.\w+$/ ? ( $db_files{$_} = $1 ) : () ) } readdir(DBDIR);
+    my @raid_dir = ();
+
+    while ( defined( my $name = readdir DBDIR ) ) {
+	if ( $name =~ /^\d\d$/ && -d "$db_dir/$name" ) {
+	    push @raid_dir, $name;
+	}
+	else {
+	    $db_files{$name} = $1 if ( $name =~ /(.+)\.\w+$/ );
+        }
+    }
+    closedir( DBDIR );
+
+    scan_raid_dir( \%db_files, $db_dir, @raid_dir );
+
     unless( keys %db_files ) {
 	warn "'$db' is an empty database\n";
     }
-    closedir( DBDIR );
 
     ## filter (out) files specified in t_regex
     my @db_files;
@@ -297,6 +310,8 @@ foreach my $rdb ( @db_desc ) {
     my @hc_tables = map { "$db.$_" } @dbh_tables;
     $rdb->{tables} = [ @hc_tables ];
 
+    $rdb->{raid_dirs} = [ get_raid_dirs( $rdb->{files} ) ];
+
     $hc_locks .= ", "  if ( length $hc_locks && @hc_tables );
     $hc_locks .= join ", ", map { "$_ READ" } @hc_tables;
     $hc_tables .= ", "  if ( length $hc_tables && @hc_tables );
@@ -370,7 +385,9 @@ if ($opt{method} =~ /^cp\b/)
 retire_directory( @existing ) if ( @existing );
 
 foreach my $rdb ( @db_desc ) {
-    my $tgt_dirpath = $rdb->{target};
+    foreach my $td ( '', @{$rdb->{raid_dirs}} ) {
+
+	my $tgt_dirpath = "$rdb->{target}/$td";
 	if ( $opt{dryrun} ) {
 	    print "mkdir $tgt_dirpath, 0750\n";
 	}
@@ -382,6 +399,7 @@ foreach my $rdb ( @db_desc ) {
 	    mkdir($tgt_dirpath, 0750)
 		or die "Can't create '$tgt_dirpath': $!\n";
 	}
+    }
 }
 
 ##############################
@@ -438,7 +456,7 @@ foreach my $rdb ( @db_desc )
   my @files = map { "$datadir/$rdb->{src}/$_" } @{$rdb->{files}};
   next unless @files;
   
-  eval { copy_files($opt{method}, \@files, $rdb->{target} ); };
+  eval { copy_files($opt{method}, \@files, $rdb->{target}, $rdb->{raid_dirs} ); };
   push @failed, "$rdb->{src} -> $rdb->{target} failed: $@"
     if ( $@ );
   
@@ -531,27 +549,33 @@ exit 0;
 # ---
 
 sub copy_files {
-    my ($method, $files, $target) = @_;
+    my ($method, $files, $target, $raid_dirs) = @_;
     my @cmd;
     print "Copying ".@$files." files...\n" unless $opt{quiet};
 
     if ($method =~ /^s?cp\b/) { # cp or scp with optional flags
-	@cmd = ($method);
+	my @cp = ($method);
 	# add option to preserve mod time etc of copied files
 	# not critical, but nice to have
-	push @cmd, "-p" if $^O =~ m/^(solaris|linux|freebsd)$/;
+	push @cp, "-p" if $^O =~ m/^(solaris|linux|freebsd)$/;
 
 	# add recursive option for scp
-	push @cmd, "-r" if $^O =~ /m^(solaris|linux|freebsd)$/ && $method =~ /^scp\b/;
+	push @cp, "-r" if $^O =~ /m^(solaris|linux|freebsd)$/ && $method =~ /^scp\b/;
+
+	my @non_raid = grep { $_ !~ m:\d\d/: } @$files;
 
 	# add files to copy and the destination directory
-	push @cmd, @$files, $target;
+	safe_system( @cp, @non_raid, $target );
+	
+	foreach my $rd ( @$raid_dirs ) {
+	    my @raid = grep { m:$rd/: } @$files;
+	    safe_system( @cp, @raid, "$target/$rd" ) if ( @raid );
+	}
     }
     else
     {
 	die "Can't use unsupported method '$method'\n";
     }
-    safe_system (@cmd);
 }
 
 #
@@ -682,6 +706,35 @@ sub get_row {
   return $sth->fetchrow_array();
 }
 
+sub scan_raid_dir {
+    my ( $r_db_files, $data_dir, @raid_dir ) = @_;
+
+    local(*RAID_DIR);
+    
+    foreach my $rd ( @raid_dir ) {
+
+	opendir(RAID_DIR, "$data_dir/$rd" ) 
+	    or die "Cannot open dir '$data_dir/$rd': $!";
+
+	while ( defined( my $name = readdir RAID_DIR ) ) {
+	    $r_db_files->{"$rd/$name"} = $1 if ( $name =~ /(.+)\.\w+$/ );
+	}
+	closedir( RAID_DIR );
+    }
+}
+
+sub get_raid_dirs {
+    my ( $r_files ) = @_;
+
+    my %dirs = ();
+    foreach my $f ( @$r_files ) {
+	if ( $f =~ m:^(\d\d)/: ) {
+	    $dirs{$1} = 1;
+	}
+    }
+    return sort keys %dirs;
+}
+
 __END__
 
 =head1 DESCRIPTION
@@ -905,6 +958,7 @@ Tim Bunce
 Martin Waite - added checkpoint, flushlog, regexp and dryrun options
                Fixed cleanup of targets when hotcopy fails. 
 	       Added --record_log_pos.
+               RAID tables are now copied (don't know if this works over scp).
 
 Ralph Corderoy - added synonyms for commands
 

sql/sql_select.cc

@@ -2119,10 +2119,17 @@ get_best_combination(JOIN *join)
 	j->type=JT_REF;				/* Must read with repeat */
       else if (ref_key == j->ref.key_copy)
       {						/* Should never be reached */
-	j->type=JT_CONST;			/* purecov: deadcode */
+	/*
+	  This happen if we are using a constant expression in the ON part
+	  of an LEFT JOIN.
+	  SELECT * FROM a LEFT JOIN b ON b.key=30
+	  Here we should not mark the table as a 'const' as a field may
+	  have a 'normal' value or a NULL value.
+	*/
+	j->type=JT_CONST;
 	if (join->const_tables == tablenr)
 	{
-	  join->const_tables++;			/* purecov: deadcode */
+	  join->const_tables++;
 	  join->const_table_map|=form->map;
 	}
       }
@@ -2251,7 +2258,7 @@ make_join_select(JOIN *join,SQL_SELECT *select,COND *cond)
       used_tables|=current_map;
 
       if (tab->type == JT_REF && tab->quick &&
-	  tab->ref.key == tab->quick->index &&
+	  (uint) tab->ref.key == tab->quick->index &&
 	  tab->ref.key_length < tab->quick->max_used_key_length)
       {
 	/* Range uses longer key;  Use this instead of ref on key */
@@ -2689,8 +2696,8 @@ static void update_depend_map(JOIN *join, ORDER *order)
 
 
 /*
-**  simple_order is set to 1 if sort_order only uses fields from head table
-**  and the head table is not a LEFT JOIN table
+  simple_order is set to 1 if sort_order only uses fields from head table
+  and the head table is not a LEFT JOIN table
 */
 
 static ORDER *
@@ -4331,8 +4338,11 @@ join_read_const(JOIN_TAB *tab)
     }
     store_record(table,1);
   }
-  else if (!table->status)			// Only happens with left join
+  else if (!(table->status & ~STATUS_NULL_ROW))	// Only happens with left join
+  {
+    table->status=0;
     restore_record(table,1);			// restore old record
+  }
   table->null_row=0;
   return table->status ? -1 : 0;
 }