Github user rxin commented on a diff in the pull request: https://github.com/apache/spark/pull/12945#discussion_r62618235 --- Diff: sql/core/src/main/scala/org/apache/spark/sql/Dataset.scala --- @@ -2306,8 +2306,37 @@ class Dataset[T] private[sql]( * @group basic * @since 1.6.0 */ + @deprecated("Use createTempView(tableName, replaceIfExists = true) instead.", "2.0.0") def registerTempTable(tableName: String): Unit = { - sparkSession.registerTable(toDF(), tableName) + createTempView(tableName, replaceIfExists = true) + } + + /** + * Creates a temporary view using the given name. The lifetime of this + * temporary view is tied to the [[SQLContext]] that was used to create this Dataset. + * + * @throws AnalysisException if the view name already exists + * + * @group basic + * @since 2.0.0 + */ + @throws[AnalysisException] + def createTempView(viewName: String): Unit = { + createTempView(viewName, replaceIfExists = false) + } + + /** + * Creates a temporary view using the given name. The lifetime of this + * temporary view is tied to the [[SQLContext]] that was used to create this Dataset. + * + * @throws AnalysisException if replaceIfExists flag is false and the view name already exists. + * + * @group basic + * @since 2.0.0 + */ + @throws[AnalysisException] + def createTempView(viewName: String, replaceIfExists: Boolean): Unit = { --- End diff -- But we already have createTempView. What I'm saying is to define two functions: 1. createTempView(viewName: String) 2. createOrReplaceTempView(viewName: String) Then it is very obvious when looking at their usage to know what the behavior is. Otherwise we will run into the issue of not knowing what the 2nd parameter mean unless somebody looks up the documentation, e.g. `createTempView("abcd", false)` - what does the false mean?
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