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The UNCOMPRESS() function was not marked as maybe_null, even though it returns NULL on invalid data. This confused the optimizer. mysql-test/r/func_compress.result: Add new results mysql-test/t/func_compress.test: Add new regression test sql/item_strfunc.h: Set maybe_null within Item_func_uncompress::fix_length_and_dec()
74 lines
2.3 KiB
Plaintext
74 lines
2.3 KiB
Plaintext
-- 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 @@max_allowed_packet=1048576*100;
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--replace_result "''" XXX "'1'" XXX
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eval select compress(repeat('aaaaaaaaaa', IF('$LOW_MEMORY', 10, 10000000))) is null;
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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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# 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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--echo End of 5.0 tests
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