ORA-38448: Indexing predicates with "string" operator is not supported.

ORA-38448
ORA-38448: Indexing predicates with "string" operator is not supported.
Cause: An unsupported operator was used in the exf$indexoper array.
Action: Choose the operators from this list : =, <, >, <=, >=, !=, is null, is not null,
nvl, and between.
More details : Viste http://www.high-oracle/ora-38448/
More details : Viste http://www.high-oracle/ora-38448/
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