bzr commit into mysql-5.4 branch (alik:2826) Bug#40358

[Alexander Nozdrin]

#At file:///mnt/raid/alik/MySQL/bzr/azalea-bugfixing/ based on
revid:aelkin@stripped

 2826 Alexander Nozdrin	2009-07-09
      Add a comment in the source (Bug#40358).

    modified:
      include/my_base.h
=== modified file 'include/my_base.h'
--- a/include/my_base.h	2009-04-01 21:36:07 +0000
+++ b/include/my_base.h	2009-07-09 16:30:43 +0000
@@ -274,7 +274,17 @@ enum ha_base_keytype {
                          HA_SPATIAL | HA_NULL_ARE_EQUAL | HA_GENERATED_KEY | \
                          HA_RTREE_INDEX)
 
-#define HA_KEY_HAS_PART_KEY_SEG 65536   /* Key contains partial segments */
+/*
+  Key contains partial segments.
+
+  This flag is internal to the MySQL server by design. It is not supposed
+  neither to be saved in FRM-files, nor to be passed to storage engines.
+  It is intended to pass information into internal static sort_keys(KEY *,
+  KEY *) function.
+
+  This flag can be calculated -- it's based on key lengths comparison.
+*/
+#define HA_KEY_HAS_PART_KEY_SEG 65536
 
 	/* Automatic bits in key-flag */
 


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