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Nested Table collection type with Blob Attributes

 
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I am currently working on a solution where I need to extract a cursor of Blob datatype .

I extract the blob from the file system but do not want to store it in a table.

Instead I created an object type with Blob attributes and created a nested table.

but when I do the following, I get an error ORA-22922: nonexistent LOB value

open O_ImgCur for
SELECT ETA_ID,FILENAME FROM TABLE(CAST (IMG_FILE_OBJ AS IMG_TBL));

If I don't use a cursor and extract individual row, then I can see the blob.

Please help
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