Fix for BUG#7377. This fix adds the same implementation for...

Fix for BUG#7377. This fix adds the same implementation for ha_myisammgr::index_type as in version 5.0.

mysql-test/r/merge.result

@@ -675,4 +675,9 @@ a	b	c
 1	2	0
 1	1	1
 1	1	0
+show index from t3;
+Table	Non_unique	Key_name	Seq_in_index	Column_name	Collation	Cardinality	Sub_part	Packed	Null	Index_type	Comment
+t3	1	a	1	a	A	NULL	NULL	NULL	YES	BTREE	
+t3	1	a	2	b	A	NULL	NULL	NULL	YES	BTREE	
+t3	1	a	3	c	A	NULL	NULL	NULL	YES	BTREE	
 drop table t1, t2, t3;

mysql-test/t/merge.test

@@ -301,5 +301,8 @@ select a,b,c from t3 force index (a) where a=1 order by a,b,c;
 explain select a,b,c from t3 force index (a) where a=1 order by a desc, b desc, c desc;
 select a,b,c from t3 force index (a) where a=1 order by a desc, b desc, c desc;
 
+# BUG#7377 SHOW index on MERGE table crashes debug server
+show index from t3;
+
 drop table t1, t2, t3;
 

sql/ha_myisammrg.cc

@@ -35,6 +35,17 @@
 const char **ha_myisammrg::bas_ext() const
 { static const char *ext[]= { ".MRG", NullS }; return ext; }
 
+const char *ha_myisammrg::index_type(uint key_number)
+{
+  return ((table->key_info[key_number].flags & HA_FULLTEXT) ? 
+	  "FULLTEXT" :
+	  (table->key_info[key_number].flags & HA_SPATIAL) ?
+	  "SPATIAL" :
+	  (table->key_info[key_number].algorithm == HA_KEY_ALG_RTREE) ?
+	  "RTREE" :
+	  "BTREE");
+}
+
 
 int ha_myisammrg::open(const char *name, int mode, uint test_if_locked)
 {

sql/ha_myisammrg.h

@@ -32,6 +32,7 @@ class ha_myisammrg: public handler
   ~ha_myisammrg() {}
   const char *table_type() const { return "MRG_MyISAM"; }
   const char **bas_ext() const;
+  const char *index_type(uint key_number);
   ulong table_flags() const
   {
     return (HA_REC_NOT_IN_SEQ | HA_AUTO_PART_KEY | HA_READ_RND_SAME |