Query Plan Regression Testing in GraphQL Federation
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Query Plan Regression Testing in GraphQL Federation
TL;DR:We built a tool that exports all Schemas and GraphQL Operations from all our customers into a private GitHub repo. When we change the Cosmo Router, we run the Router in "headless Query Planning mode" against the exported queries and check if the query plans are the same as the previous version. This ensures that we never accidentally introduce a breaking change to our customers.Cosmo Router serves billions of requests every day. If a Query…
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