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Diffstat (limited to 'Docs/manual.texi')
| -rw-r--r-- | Docs/manual.texi | 28 |
1 files changed, 20 insertions, 8 deletions
diff --git a/Docs/manual.texi b/Docs/manual.texi index c6eb5dac81e..3ea77c1dc26 100644 --- a/Docs/manual.texi +++ b/Docs/manual.texi @@ -31588,17 +31588,22 @@ message to less than 80 characters so that it fits the width of a standard terminal screen. The return value of the main function @code{xxx()} is the function value, for -@code{long long} and @code{double} functions. For string functions, the -string is returned in the @code{result} and @code{length} arguments. -@code{result} is a buffer at least 255 bytes long. Set these to the contents -and length of the return value. For example: +@code{long long} and @code{double} functions. A string functions should +return a pointer to the result and store the length of the string in the +@code{length} arguments. @code{result} is a buffer at least 255 bytes long. +Set these to the contents and length of the return value. For example: @example memcpy(result, "result string", 13); *length = 13; @end example -The string function return value normally also points to the result. +If your string functions that needs to return a string longer than 255 +bytes, you must allocate the space for it with @code{malloc()} in your +@code{xxx_init()} function or your @code{xxx()} function and free it in +your @code{xxx_deinit()} function. You can store the allocated memory +in the @code{ptr} slot in the @code{UDF_INIT} structure for reuse by +future @code{xxx()} calls. @xref{UDF calling sequences}. To indicate a return value of @code{NULL} in the main function, set @code{is_null} to @code{1}: @@ -40403,6 +40408,12 @@ though, so Version 3.23 is not released as a stable version yet. @appendixsubsec Changes in release 3.23.31 @itemize @bullet @item +Using @code{HAVING} on an empty table could produce one result row. +@item +Fixed that the @strong{MySQL} RPM is not depending on perl5 anymore. +@item +Fixed some problems with @code{HEAP} tables on windows. +@item @code{SHOW TABLE STATUS} didn't show correct average row length for tables bigger than 4G. @item @@ -40412,15 +40423,16 @@ Added option @code{MEDIUM} to @code{CHECK TABLE}. @item Fixed problem when using @code{DECIMAL()} keys on negative numbers. @item -@code{HOUR()} on a @code{CHAR} column always returned @code{NULL}. +@code{HOUR()} (and some other @code{TIME} functions) on a @code{CHAR} column +always returned @code{NULL}. @item Fixed security bug in something (please upgrade if you are using a earlier MySQL 3.23 version). @item Fixed buffer overflow bug when writing a certain error message. @item -Added usage of @code{getrlimit()} on Linux to get @code{-O --open-files-limit=#} -to work on Linux. +Added usage of @code{getrlimit()} on Linux to get @code{-O +--open-files-limit=#} to work on Linux. @item Added new mysqld variable: bdb_version. @item |