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Implement TableProvider for DataFrameImpl to allow registration of logical plans #1698

@cpcloud

Description

@cpcloud

Is your feature request related to a problem or challenge? Please describe what you are trying to do.
A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
(This section helps Arrow developers understand the context and why for this feature, in addition to the what)

I'd like to be able to assign a name to previously constructed logical plan.

Describe the solution you'd like
A clear and concise description of what you want to happen.

let mut ctx = ExecutionContext::new(...);
let table = ctx.table("t");
let df = table.filter(...);
ctx.register_table("filtered_t", something_corresponding_to_df);

Describe alternatives you've considered
A clear and concise description of any alternative solutions or features you've considered.

I haven't considered any alternatives.

Additional context
Add any other context or screenshots about the feature request here.

I'll have a PR up shortly for this.

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