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Check if AND/OR expression can be NULL

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Better fix for ALTER TABLE on BDB tables
(Both of the above fixes are already in 4.0)


Docs/manual.texi:
  Changelog
sql/item_cmpfunc.cc:
  Check if AND/OR expression can be NULL
sql/sql_table.cc:
  Better fix for ALTER TABLE on BDB tables
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Docs/manual.texi
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@ -46929,6 +46929,10 @@ not yet 100% confident in this code.
@appendixsubsec Changes in release 3.23.53
@itemize @bullet
@item
Changed @code{AND/OR} to report that they can return NULL. This fixes a
small problem in @code{GROUP BY} on @code{AND/OR} expression that return
@code{NULL}.
@item
Fixed a @code{BDB}-related @code{ALTER TABLE} bug with dropping a column
and shutting down immediately thereafter.
@item