Koen Verbeeck • 6/1/2026

Error Deploying GraphQL in Fabric: dm_exec_describe_first_result_set

This article details a deployment error encountered when using fabric-cicd to publish a GraphQL API in Microsoft Fabric. The error, 'DatasourceInvalidStoredProcedure', occurs because stored procedures used as mutations must return consistent metadata across all code branches, as verified by sys.dm_exec_describe_first_result_set. The author explains how mismatched SELECT statements in TRY and CATCH blocks cause the failure and provides a fix by ensuring both branches return identical columns. A practical guide for developers working with GraphQL and Fabric.

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#error handling #graphql #sql