Alterações na distribuição 3.23.51 (31 May 2002)

Fix bug with closing tags missing slash for mysqldump XML output.

• Remove end space from ENUM values. (This fixed a problem with SHOW CREATE TABLE.)
• Fixed bug in CONCAT_WS() that cut the result.
• Changed name of server variables Com_show_master_stat to Com_show_master_status and Com_show_slave_stat to Com_show_slave_status.
• Changed handling of gethostbyname() to make the client library thread-safe even if gethostbyname_r doesn't exist.
• Fixed core-dump problem when giving a wrong password string to GRANT.
• Fixed bug in DROP DATABASE with symlinked directory.
• Fixed optimization problem with DATETIME and value outside DATETIME range.
• Removed Sleepycat's BDB doc files from the source tree, as they're not needed (MySQL covers BDB in its own documentation).
• Fixed MIT-pthreads to compile with glibc 2.2 (needed for make dist).
• Fixed the FLOAT(X+1,X) is not converted to FLOAT(X+2,X). (This also affected DECIMAL, DOUBLE and REAL types)
• Fixed the result from IF() is case in-sensitive if the second and third arguments are case sensitive.
• Fixed core dump problem on OSF/1 in gethostbyname_r.
• Fixed that underflowed decimal fields are not zero filled.
• If we get an overflow when inserting '+11111' for DECIMAL(5,0) UNSIGNED columns, we will just drop the sign.
• Fixed optimization bug with ISNULL(expression_which_cannot_be_null) and ISNULL(constant_expression).
• Fixed host lookup bug in the glibc library that we used with the 3.23.50 Linux-x86 binaries.

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