incremental delivery with deduplication + concurrent execution

At a glance

• Identifier: #1034
• Stage: RFC X / Superseded
• Champion: @yaacovCR
• Latest activity: Marked as Superseded on 2025-06-12
• Spec PR: https://github.com/graphql/graphql-spec/pull/1034

Spec PR description

supersedes #1026

This version sets up an Incremental Publisher Record that includes: (a) an Execution Event Queue input stream on the and (b) a Subsequent Result output stream.

No mutations happen outside the algorithms that define any records.

With the following caveats:

1. The event queue is not considered to be "mutated" when different sub-algorithms push events into it.
2. The CreateIncrementalPublisher() algorithm is where the magic happens, a long algorithm where the Execution Event Handler and lazily executed Subsequent Result stream are managed concurrently. To increase readability, several subprocedures/macros/inner functions are defined that have access to the variables defined within the entire algorithm.