[native] Derive TableScan stream type as FIXED

[arhimondr]

Description

In native a fixed number of drivers is created for a pipeline containing TableScan

Motivation and Context

To avoid unnecessary local exchange when fixed number of streams is necessary (for example for TableWriteOperator)

Impact

Improved performance for certain type of INSERT INTO queries

Test Plan

CI, Unit Tests

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[jaystarshot]

// Native execution creates a fixed number of drivers for TableScan pipelines

Is there a reason why only native execution creates fixed number of drivers?

[arhimondr]

In Presto (Java) the number of TableScan drivers created was chosen adaptively. That added a lot of complexity to TaskExecutor and the benefit was not clear.

In Velox the number of TableScan drivers is fixed. The adaptivity can still be achieved via delivering splits to only a subset of TableScan drivers without going into complexity of managing the number of drivers dynamically. Here's an example where @xiaoxmeng adds TableScan scaling: facebookincubator/velox#11879

[arhimondr]

Ready for review

[amitkdutta]

Thanks @arhimondr

[aditi-pandit]

Thanks @arhimondr for this PR and the context.

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@arhimondr has imported this pull request. If you are a Meta employee, you can view this diff on Phabricator.