datafusion-ballista
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Support graceful shutdown for scheduler.
Which issue does this PR close?
Closes #565.
Rationale for this change
What changes are included in this PR?
Setting the terminating flag when receiving terminate signals and shutdown the server gracefully.
Are there any user-facing changes?
No.
N.B. I'm really a newbie to Rust. Appreciate in advance for your reviewing the PR and raising comments.
@liukun4515