Sybase IQ offers this support for the WORD (WD) index on LONG VARCHAR (CLOB) columns:
You can create a WD index on columns of CHAR, VARCHAR, and LONG VARCHAR data types in Sybase Central.
The widest column supported by the WD index is the maximum width for a LOB column. (The maximum length is equal to 4GB multiplied by the database page size.)
The maximum word length supported by Sybase IQ is 255 bytes.
All sp_iqcheckdb options for WD indexes over CHAR and VARCHAR columns are also supported for LONG VARCHAR (CLOB) columns, including allocation, check, and verify modes.
You can use sp_iqrebuildindex to rebuild a WD index over a LONG VARCHAR (CLOB) column.
Chinese text or documents in a binary format require ETL preprocessing to locate and transform words into a form that can be parsed by the WD index.
