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To rename a dimension/Column you need to re-index your data with new column names. You could also change the name in the output of a query using the “outputName” of a dimensionSpec (this is like “SELECT foo AS bar” in SQL), but this wouldn’t change what’s actually in the segment. https://druid.apache.org/docs/latest/data-management/update.html#reindex

Is it work for real time ingestion

should work , You can test.