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Title: Backport 26.1: Allow empty unions to be completed by extensions by andimarek · Pull Request #4447 · graphql-java/graphql-java · GitHub

Open Graph Title: Backport 26.1: Allow empty unions to be completed by extensions by andimarek · Pull Request #4447 · graphql-java/graphql-java

X Title: Backport 26.1: Allow empty unions to be completed by extensions by andimarek · Pull Request #4447 · graphql-java/graphql-java

Description: Backport of #4388 to the 26.x maintenance branch. Summary Allow SDL union definitions with no base members when union extensions provide members Keep truly empty unions invalid, including directive-only extensions Validate union extension members against the previous effective union so duplicates across the base definition or earlier extensions are rejected Add regression coverage for #4200 and additional draft-spec union extension cases Fixes #4200 Testing ./gradlew test --tests graphql.schema.idl.SchemaGeneratorTest --tests graphql.schema.idl.SchemaTypeCheckerTest

Open Graph Description: Backport of #4388 to the 26.x maintenance branch. Summary Allow SDL union definitions with no base members when union extensions provide members Keep truly empty unions invalid, including directiv...

X Description: Backport of #4388 to the 26.x maintenance branch. Summary Allow SDL union definitions with no base members when union extensions provide members Keep truly empty unions invalid, including directiv...

Opengraph URL: https://github.com/graphql-java/graphql-java/pull/4447

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ea4ac10 Allow empty unions to be completed by extensions andimarek May 19, 2026 https://github.com/graphql-java/graphql-java/pull/4447/commits/ea4ac1057530b9c28a3626dc37b519c2f6a5b331
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