if the stream is interrupted due to a failure the StatusOr<spanner::Row> contains the error. The function returns a successful StatusOr<> with an empty spanner::Row to indicate end-of-stream.
Metadata()
Returns metadata about the result set, such as the field types and the transaction id created by the request.
[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Missing the information I need","missingTheInformationINeed","thumb-down"],["Too complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-08-22 UTC."],[[["\u003cp\u003eThis document details the \u003ccode\u003eResultSourceInterface\u003c/code\u003e for Google Cloud Spanner, specifically for version 2.11.0, up to the latest release 2.37.0-rc.\u003c/p\u003e\n"],["\u003cp\u003eThe \u003ccode\u003eResultSourceInterface\u003c/code\u003e defines how to interact with a stream of \u003ccode\u003eRows\u003c/code\u003e from Spanner, typically resulting from a \u003ccode\u003eRead()\u003c/code\u003e or \u003ccode\u003eExecuteQuery()\u003c/code\u003e operation.\u003c/p\u003e\n"],["\u003cp\u003eThe \u003ccode\u003eNextRow()\u003c/code\u003e function retrieves the subsequent row in the stream and can return an error \u003ccode\u003eStatusOr\u003c/code\u003e if the stream fails, or a successful empty \u003ccode\u003eRow\u003c/code\u003e to signal the end of the stream.\u003c/p\u003e\n"],["\u003cp\u003e\u003ccode\u003eMetadata()\u003c/code\u003e and \u003ccode\u003eStats()\u003c/code\u003e functions provide details about the result set, such as field types, transaction IDs, the number of rows, and the query plan used.\u003c/p\u003e\n"],["\u003cp\u003eThe \u003ccode\u003eRowStream\u003c/code\u003e class, which this interface is for, is designed to be mockable, allowing for testing of \u003ccode\u003eClient\u003c/code\u003e behaviors.\u003c/p\u003e\n"]]],[],null,[]]
