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manual.texi HEAP does allow indexes on NULL columns as of 4.0.2.

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Docs/manual.texi:
  HEAP does allow indexes on NULL columns as of 4.0.2.
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@ -38573,7 +38573,8 @@ to @code{MyISAM} tables where any prefix of the key can be used to find rows.
@item
@code{HEAP} doesn't support @code{AUTO_INCREMENT} columns.
@item
@code{HEAP} doesn't support an index on a @code{NULL} column.
Prior to MySQL 4.0.2, @code{HEAP} doesn't support an index on a @code{NULL}
column.
@item
You can have non-unique keys in a @code{HEAP} table (this isn't common for
hashed tables).