Microsoft.Data.Sqlite: Enable GetFieldValue<Stream>() and TextReader

[bricelam]

Part of #19991

[roji]

Just a note about the lifecycle of returned Stream/TextReader instances... IIRC in other ADO.NET, when you call Read on the reader, any Stream/TextReader which has been handed out for a column on the existing row is automatically invalidated (disposed), since it's not possible to continue reading from previous rows (data is no longer buffered). I'm guessing that with Sqlite this doesn't matter, because the Stream/TextReader is just reading directly from disk etc., but just want to make sure.

[bricelam]

@roji The stream here is either a MemoryStream backed by a byte[] copy of the data or a SqliteBlob which reads independently from the command and reader. I can't express how glad I am that I don't have to deal with all the complexities that going over the wire causes. 😉

[roji]

Yeah, I can confirm that whenever I look at your provider I become very jealous... :)