[SOL-124] [04000] Error while evaluating filter: Compression problem detected.
Try recompressing used tables. See also EXASOL-1244 Created: 18.07.2014 Updated:
01.10.2014 Resolved: 18.07.2014
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Affects
Version/s:
Fix Version/s:
Published
Solution Center
EXASolution
EXASolution 4.2.5
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Workaround
Captain EXASOL
None
Issue Links:
Causing
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Symptoms:
[04000] Error while evaluating filter: Compression problem detected. Try recompressing used tables. See also EXASOL-1244
The error message is caused by a bug at compression of varchar-columns
prior to the version 4.2.5. Under some specific circumstances, the same
string will be transformed internally to two different compressed
presentations during an insert operation.
Explanation:
None
Assignee:
Captain EXASOL
Reading the value causes normally no issues as it will be decompressed into
a consistent presentation.
If there's however a simple filter like '<column> = <constant>',
EXASolution works directly with compressed values to speed up the query
execution.
In this case, only the rows matching to one of the compressed
representations will be found.
Solution:
The data inserted by the version 4.2.5 and above won't be affected by the
bug. The version 4.2.5 also detects erroneous values and interrupts the
execution displaying the error message above.
Execute 'recompress <table>' on affected table
Please note, that the system doesn't re-compress the affected table
automatically to avoid transaction conflicts.
SQL - Data types
Category 1:
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