Github user chenghao-intel commented on a diff in the pull request:
https://github.com/apache/spark/pull/6143#discussion_r30308534
--- Diff: sql/core/src/main/scala/org/apache/spark/sql/DataFrame.scala ---
@@ -1193,12 +1193,18 @@ class DataFrame private[sql](
def javaRDD: JavaRDD[Row] = toJavaRDD
/**
- * Registers this [[DataFrame]] as a temporary table using the given
name. The lifetime of this
- * temporary table is tied to the [[SQLContext]] that was used to create
this DataFrame.
- *
+ * Check if the table name already exists
+ * Registers this [[DataFrame]] as a temporary table using the given
name if
+ * no such table name present else throw an exception
+ * The lifetime of this temporary table is tied to
+ * the [[SQLContext]] that was used to create this DataFrame.
+ *
* @group basic
*/
def registerTempTable(tableName: String): Unit = {
+ if( sqlContext.catalog.tableExists(Seq(tableName)) ){
--- End diff --
Nit: space after `if`, and no space after `(` or before `)`.
Says:
```scala
if (sqlContext.catalog.tableExists(Seq(tableName))) {
```
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