Treat flushing state as terminal state if buffer is empty #22711
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The new exchange protocol in prestodb#21926 expects the HEAD request to indicate the buffer is completed when the noMorePages signal has been set and the buffer is empty. This commit fixes the current behavior, which is that the coordinator expects at least one GET to transition the output buffer to completed state before returning that the buffer has been completed.
arhimondr
previously approved these changes
May 13, 2024
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@arhimondr I removed the testing commit from @Yuhta but otherwise this PR is unchanged. |
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Description
This brings the protocol designed in #21926 to be in line with expectations from the C++ implementation being worked on in #22697.
The new exchange protocol in #21926 expects the HEAD request to indicate the buffer is completed when the noMorePages signal has been set and the buffer is empty. This commit fixes the current behavior, which is that the coordinator expects at least one GET to transition the output buffer to completed state before returning that the buffer has been completed.
Motivation and Context
Complete the functionality in #21926.
Impact
Small behavior changes necessary for #21926.
Test Plan
Tests have been updated. There are no existing tests that make REST calls to underlying worker tasks, and this functionality will be covered by native integration tests once the protocol is updated in #21926.
Contributor checklist
Release Notes