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37d2019d17
Inconsistent behavior of session variable max_allowed_packet
(and net_buffer_length); only assignment to the global variable
has any effect, without this being obvious to the user.
The patch for Bug#22891 is backported to 5.0, making the two
session variables read-only. As this is a backport to GA
software, the error used when trying to assign to the read-
only variable is ER_UNKNOWN_ERROR. The error message is the
same as in 5.1+.
mysql-test/t/variables.test:
Tests are changed to account for the new semantics, and assignment to the read-only variables is added to test
the emission of the correct error message.
sql/set_var.cc:
Both max_allowed_packet and net_buffer_length are changed
to be of type sys_var_thd_ulong_session_readonly. ER_UNKNOWN_ERROR is used to indicate an attempt to assign
to an instance of a read-only variable.
sql/set_var.h:
Class sys_var_thd_ulong_session_readonly is added.
112 lines
3.3 KiB
Text
112 lines
3.3 KiB
Text
-- source include/have_compress.inc
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#
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# Test for compress and uncompress functions:
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#
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# Note that this test gives error in the gzip library when running under
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# valgrind, but these warnings can be ignored
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select @test_compress_string:='string for test compress function aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa ';
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select length(@test_compress_string);
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select uncompress(compress(@test_compress_string));
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explain extended select uncompress(compress(@test_compress_string));
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select uncompressed_length(compress(@test_compress_string))=length(@test_compress_string);
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explain extended select uncompressed_length(compress(@test_compress_string))=length(@test_compress_string);
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select uncompressed_length(compress(@test_compress_string));
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select length(compress(@test_compress_string))<length(@test_compress_string);
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create table t1 (a text, b char(255), c char(4)) engine=myisam;
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insert into t1 (a,b,c) values (compress(@test_compress_string),compress(@test_compress_string),'d ');
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select uncompress(a) from t1;
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select uncompress(b) from t1;
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select concat('|',c,'|') from t1;
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drop table t1;
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select compress("");
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select uncompress("");
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select uncompress(compress(""));
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select uncompressed_length("");
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#
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# errors
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#
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create table t1 (a text);
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insert t1 values (compress(null)), ('A\0\0\0BBBBBBBB'), (compress(space(50000))), (space(50000));
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select length(a) from t1;
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select length(uncompress(a)) from t1;
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drop table t1;
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#
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# Bug #5497: a problem with large strings
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# note that when LOW_MEMORY is set the "test" below is meaningless
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#
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set @@global.max_allowed_packet=1048576*100;
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--replace_result "''" XXX "'1'" XXX
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# reconnect to make the new max packet size take effect
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--connect (newconn, localhost, root,,)
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eval select compress(repeat('aaaaaaaaaa', IF('$LOW_MEMORY', 10, 10000000))) is null;
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disconnect newconn;
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--source include/wait_until_disconnected.inc
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connection default;
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set @@global.max_allowed_packet=default;
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#
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# Bug #18643: problem with null values
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#
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create table t1(a blob);
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insert into t1 values(NULL), (compress('a'));
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select uncompress(a), uncompressed_length(a) from t1;
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drop table t1;
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#
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# Bug #23254: problem with compress(NULL)
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#
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create table t1(a blob);
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insert into t1 values ('0'), (NULL), ('0');
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--disable_result_log
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select compress(a), compress(a) from t1;
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--enable_result_log
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select compress(a) is null from t1;
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drop table t1;
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--echo End of 4.1 tests
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#
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# Bug #18539: uncompress(d) is null: impossible?
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#
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create table t1 (a varchar(32) not null);
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insert into t1 values ('foo');
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explain select * from t1 where uncompress(a) is null;
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select * from t1 where uncompress(a) is null;
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explain select *, uncompress(a) from t1;
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select *, uncompress(a) from t1;
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select *, uncompress(a), uncompress(a) is null from t1;
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drop table t1;
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#
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# Bug #44796: valgrind: too many my_longlong10_to_str_8bit warnings after
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# uncompressed_length
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#
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CREATE TABLE t1 (c1 INT);
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INSERT INTO t1 VALUES (1), (1111), (11111);
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# Disable warnings to avoid dependency on max_allowed_packet value
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--disable_warnings
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SELECT UNCOMPRESS(c1), UNCOMPRESSED_LENGTH(c1) FROM t1;
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--enable_warnings
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# We do not need the results, just make sure there are no valgrind errors
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--disable_result_log
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EXPLAIN EXTENDED SELECT * FROM (SELECT UNCOMPRESSED_LENGTH(c1) FROM t1) AS s;
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--enable_result_log
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DROP TABLE t1;
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--echo End of 5.0 tests
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