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Using certain methods of the Java API, BLOB columns are returned as NULL, even if the content of the column is not NULL.
This occurs when BLOBs are fetched using the execute/fetch method of retrieval.
Fetching BLOBs from an ArcSDE table or layer using the stream buffer has not yet been implemented.
BLOB values can be fetched from rows in a table or layer by using the method of fetching a single row at a time, rather than executing the stream and then fetching the resulting rows.