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Bug#8841 - CHECKSUM TABLE is broken in MyISAM

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There are (at least) two implementations of the checksum
computation. One is in MyISAM for the quick checksum. It
is executed on every row change. The other is in the
SQL layer for the extended checksum. It retrieves all rows
of a table via the respective storage engine.

In former MySQL versions varchars were stored with their 
maximum length, but now with their real length similar to
blobs.

This change had been forgotten to take care of in the
extended checksum calculation. Hence too much data was
checksumed. In MyISAM this change had been taken care of 
already. Only the real data is included in the checksum.

I changed mysql_checksum_table() so that it uses the
length information of true varchar fields instead
of the field length like in former varchar 
implementations.


mysql-test/r/innodb.result:
  Bug#8841 - CHECKSUM TABLE is broken in MyISAM
  Fixed test results.
mysql-test/r/myisam.result:
  Bug#8841 - CHECKSUM TABLE is broken in MyISAM
  Fixed test results.
sql/sql_table.cc:
  Bug#8841 - CHECKSUM TABLE is broken in MyISAM
  Changed mysql_checksum_table() so that it uses the
  length information of true varchar fields instead
  of the field length like in former varchar 
  implementations.
This commit is contained in:
unknown
2006-02-01 16:46:44 +01:00
parent ae951e0f72
commit 08394605dc
3 changed files with 10 additions and 9 deletions
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10
mysql-test/r/innodb.result
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@ -1457,16 +1457,16 @@ Error 1146 Table 'test.t4' doesn't exist
checksum table t1, t2, t3, t4;
Table Checksum
test.t1 2948697075
test.t2 3835700799
test.t3 3835700799
test.t2 2948697075
test.t3 2948697075
test.t4 NULL
Warnings:
Error 1146 Table 'test.t4' doesn't exist
checksum table t1, t2, t3, t4 extended;
Table Checksum
test.t1 3092701434
test.t2 3835700799
test.t3 3835700799
test.t1 2948697075
test.t2 2948697075
test.t3 2948697075
test.t4 NULL
Warnings:
Error 1146 Table 'test.t4' doesn't exist