Predicate evaluation is not offloaded to Exadata Cell in the following cases
A scan is performed on a flashback table.
A query that has more than 255 columns referenced
A query that has more than 255 columns referenced and HCC compressed
The tablespace is encrypted, and the CELL_OFFLOAD_DECRYPTION parameter is set to false
The tablespace is encrypted, and the CELL_OFFLOAD_DECRYPTION parameter is set to true