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Merge pull request #269936 from KrishnakumarRukmangathan/patch-31
Update concepts-data-flow-debug-mode.md
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articles/data-factory/concepts-data-flow-debug-mode.md

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@@ -80,6 +80,9 @@ When running in Debug Mode in Data Flow, your data won't be written to the Sink
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Data Preview is a snapshot of your transformed data using row limits and data sampling from data frames in Spark memory. Therefore, the sink drivers aren't utilized or tested in this scenario.
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> [!NOTE]
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> Data Preview displays time as per the browser's locale setting.
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### Testing join conditions
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When unit testing Joins, Exists, or Lookup transformations, make sure that you use a small set of known data for your test. You can use the Debug Settings option described previously to set a temporary file to use for your testing. This is needed because when limiting or sampling rows from a large dataset, you can't predict which rows and which keys are read into the flow for testing. The result is nondeterministic, meaning that your join conditions might fail.

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