[SOL-124]  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 Status: Project: Component/s: Affects Version/s: Fix Version/s: Published Solution Center EXASolution EXASolution 4.2.5 Type: Reporter: Labels: Workaround Captain EXASOL None Issue Links: Causing Related Symptoms:  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: Generated at Wed Feb 10 05:49:54 CET 2016 using JIRA 6.4.12#64027sha1:e3691cc1283c0f3cef6d65d3ea82d47743692b57.