Github user cloud-fan commented on the issue:
https://github.com/apache/spark/pull/21946
> a ReadSupportProvider will supply a create method (or anonymousTable) to
return a Table that implements ReadSupport...
I'd prefer the current proposal in
https://docs.google.com/document/d/1DDXCTCrup4bKWByTalkXWgavcPdvur8a4eEu8x1BzPM/edit?ts=5b613c42
: `ReadSupportProvider#create` returns `ReadSupport`.
1. Table supports both read and write, but we may want to allow read-only
data sources.
2. the `Table` interface is still being developed, we can switch to it if
we find it's more feasible later.
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