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Document the blob filter restriction in FB2.

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robocop 2005-12-01 07:12:00 +00:00
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doc/sql.extensions/README.ddl.txt
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@ -177,3 +177,13 @@ itself can override such domain. On the other hand, the field can be given a
type directly in whose case the default belongs logically to the field (albeit
the information is kept on an implicit domain created behind scenes).
6) New blob filter restriction.
(Dmitry Yemanov)
In FB2, the pair (input subtype, output subtype) must be unique for blob filter
declarations. This fix stops ambiguity in deciding which blob filter will be
executed to go from input type X to output type Z. If you have such problem in
databases created with earlier versions and you have a backup for them that want
to restore in FB2, expect to see your database restore being rejected by FB2.