Experimental commit for stream processing #1600
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Which issue does this PR close?
#1544
Rationale for this change
Just some basic hooking into logical plan where necessary. I'm not sure if this is the correct way to do this, but it was the most obvious to me. This may not be the correct way to do this, a real dataframe impl tailored around streams maybe the better option here, but this is just to get the conversation going about what we might do.
What changes are included in this PR?
Changes to logical plan and physical plan.
Are there any user-facing changes?
Streaming support for kafka :-D