refactor(barrier): add control request to explicitly create partial graph

[wenym1]

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What's changed and what's your intention?

Previously, in local barrier manager, we create a new partial graph state when we see a partial graph id that does not previously exist. In this PR, we will change to add a new control stream request to explicitly create new partial graph, and in recovery when we initialize the control stream, we will specify the initial partial graph.

The set of subscriptions is maintained globally in the local barrier manager. In this PR, we will maintain it per partial graph.

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[wenym1]

• refactor(barrier): decouple barrier collect and sync in local barrier manager #19393
• refactor(barrier): add control request to explicitly create partial graph #19383 👈 (View in Graphite)
• fix(ci): delete unused python install before embedded UDF tests #19386
• main

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[kwannoel]

Previously, in local barrier manager, we create a new partial graph state when we see a partial graph id that does not previously exist. In this PR, we will change to add a new control stream request to explicitly create new partial graph, and in recovery when we initialize the control stream, we will specify the initial partial graph.

I suppose this is more of a code quality improvement? Are there any other motivations behind these changes?

[wenym1]

Previously, in local barrier manager, we create a new partial graph state when we see a partial graph id that does not previously exist. In this PR, we will change to add a new control stream request to explicitly create new partial graph, and in recovery when we initialize the control stream, we will specify the initial partial graph.

I suppose this is more of a code quality improvement? Are there any other motivations behind these changes?

Code quality is one of the concerns. The other motivation is to maintain subscriptions in per partial graph manner instead of globally. The change that explicitly create a partial graph makes such code easier.

[kwannoel]

We can introduce a type alias for SubscriptionId. No need to be in this PR.