Due to a programming error it is rarely possible that a table gets corrupted if a delta merge of the table fails. The corruption becomes visible when selecting from this table after a restart of the database or after unloading the table.
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When selecting from a column store table you receive the following error message:
Udiv Lookup failed for <schema>:$delta_1$en and rowid '<id>';
$job$=Replaying DeltaLog for <schema>:
There are error messages of this kind in the indexserver trace file: "PoolThread.cpp(00204) : thread MergeIndexJob/prepareDeltaMerge/ threw unhandled ltt exception exception 1: no.1000002 (TRexUtils/IndexVector.cpp:196)"
Either you have to restore a backup or to drop and re-load the table again.
SAP is going to provide a solution in Revision 18.