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Rationale for this change
The link from the datafusion docs to the paper "Encapsulation of parallelism in the Volcano query processing system" was broken.
What changes are included in this PR?
This PR changes the link from https://w6113.github.io/files/papers/volcanoparallelism-89.pdf (which is broken) to https://doi.org/10.1145/93605.98720 (which should "never" break).
A free PDF is available at the new link.
The Volcano paper is cited twice in the
datafusion
codebase. PR #14497 fixed one of the two citations. This new PR fixes the other citation 🙂.