Github user jodersky commented on the issue: https://github.com/apache/spark/pull/15513 I agree with that the extended part is usually multiple lines, my observation is that an newline will be inserted *before* any text, since the string starts the line following `extended="""`. Just wanted to make sure this is intended. Regrading the `stripMargin`: unfortunately `stripMargin` is a method on a string wrapper, hence is not a constant and cannot be used in annotation arguments. I ran into this myself in #15398. A workaround I could imagine is to call `stripMargin` here https://github.com/apache/spark/blob/master/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/FunctionRegistry.scala#L498
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