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08f192f81b
The problem was that we restored SQL_CACHE, SQL_NO_CACHE flags in SELECT statement from internal structures based on value set later at runtime, not the original value set by the user. The solution is to remember that original value.
82 lines
3.4 KiB
Plaintext
82 lines
3.4 KiB
Plaintext
select @test_compress_string:='string for test compress function aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa ';
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@test_compress_string:='string for test compress function aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa '
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string for test compress function aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
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select length(@test_compress_string);
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length(@test_compress_string)
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117
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select uncompress(compress(@test_compress_string));
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uncompress(compress(@test_compress_string))
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string for test compress function aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
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explain extended select uncompress(compress(@test_compress_string));
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE NULL NULL NULL NULL NULL NULL NULL No tables used
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Warnings:
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Note 1003 select uncompress(compress((@test_compress_string))) AS `uncompress(compress(@test_compress_string))`
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select uncompressed_length(compress(@test_compress_string))=length(@test_compress_string);
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uncompressed_length(compress(@test_compress_string))=length(@test_compress_string)
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1
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explain extended select uncompressed_length(compress(@test_compress_string))=length(@test_compress_string);
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE NULL NULL NULL NULL NULL NULL NULL No tables used
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Warnings:
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Note 1003 select (uncompressed_length(compress((@test_compress_string))) = length((@test_compress_string))) AS `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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uncompressed_length(compress(@test_compress_string))
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117
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select length(compress(@test_compress_string))<length(@test_compress_string);
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length(compress(@test_compress_string))<length(@test_compress_string)
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1
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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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uncompress(a)
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string for test compress function aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
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select uncompress(b) from t1;
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uncompress(b)
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string for test compress function aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
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select concat('|',c,'|') from t1;
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concat('|',c,'|')
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|d|
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drop table t1;
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select compress("");
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compress("")
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select uncompress("");
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uncompress("")
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select uncompress(compress(""));
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uncompress(compress(""))
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select uncompressed_length("");
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uncompressed_length("")
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0
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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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length(a)
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NULL
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12
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76
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50000
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select length(uncompress(a)) from t1;
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length(uncompress(a))
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NULL
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NULL
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50000
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NULL
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Warnings:
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Error 1259 ZLIB: Input data corrupted
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Error 1256 Uncompressed data size too large; the maximum size is 1048576 (probably, length of uncompressed data was corrupted)
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drop table t1;
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set @@max_allowed_packet=1048576*100;
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select compress(repeat('aaaaaaaaaa', IF(XXX, 10, 10000000))) is null;
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compress(repeat('aaaaaaaaaa', IF(XXX, 10, 10000000))) is null
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0
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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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uncompress(a) uncompressed_length(a)
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NULL NULL
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a 1
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drop table t1;
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