bzr commit into mysql-5.5.0-next-mr-runtime branch (alik:2931) Bug#40358

[Alexander Nozdrin]

#At file:///mnt/raid/alik/MySQL/bzr/backporting/mysql-next-mr-runtime/ based on
revid:alik@stripped

 2931 Alexander Nozdrin	2009-10-16
      Backporting revision from 6.0:
      revno: 2617.56.25
      committer: Alexander Nozdrin <alik@stripped>
      branch nick: azalea-bugfixing
      timestamp: Thu 2009-07-09 20:30:43 +0400
      message:
        Add a comment in the source (Bug#40358).

    modified:
      include/my_base.h
=== modified file 'include/my_base.h'
--- a/include/my_base.h	2009-07-24 06:45:06 +0000
+++ b/include/my_base.h	2009-10-16 15:21:54 +0000
@@ -255,7 +255,17 @@ enum ha_base_keytype {
                          HA_BINARY_PACK_KEY | HA_FULLTEXT | HA_UNIQUE_CHECK | \
                          HA_SPATIAL | HA_NULL_ARE_EQUAL | HA_GENERATED_KEY)
 
-#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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