bk commit into 5.1 tree (sergefp:1.2628)

[Sergey Petrunia]

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5.1 repository of psergey. When psergey does a push these changes will
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ChangeSet@stripped, 2007-11-06 21:57:51+03:00, sergefp@stripped +1 -0
  Better comments

  sql/opt_range.h@stripped, 2007-11-06 21:57:39+03:00, sergefp@stripped +7 -2
    Better comments

diff -Nrup a/sql/opt_range.h b/sql/opt_range.h
--- a/sql/opt_range.h	2007-05-24 02:39:21 +04:00
+++ b/sql/opt_range.h	2007-11-06 21:57:39 +03:00
@@ -24,9 +24,14 @@
 #endif
 
 typedef struct st_key_part {
-  uint16           key,part, store_length, length;
+  uint16           key,part;
+  /* See KEY_PART_INFO for meaning of the next two: */
+  uint16           store_length, length;
   uint8            null_bit;
-  /* Keypart flags (0 if partition pruning is used) */
+  /*
+    Keypart flags (0 when this structure is used by partition pruning code
+    for fake partitioning index description)
+  */
   uint8 flag;
   Field            *field;
   Field::imagetype image_type;