Github user liancheng commented on a diff in the pull request:
https://github.com/apache/spark/pull/4689#discussion_r24976046
--- Diff: sql/core/src/main/scala/org/apache/spark/sql/SQLContext.scala ---
@@ -888,6 +893,13 @@ class SQLContext(@transient val sparkContext:
SparkContext)
* only during the lifetime of this instance of SQLContext.
*/
private[sql] def registerDataFrameAsTable(df: DataFrame, tableName:
String): Unit = {
+ if (catalog.tableExists(Seq(tableName)) &&
cacheManager.lookupCachedData(df).isEmpty) {
+ // If the table already exists and the data of df has not already
been cached
+ // (we are trying to overwrite an existing temporary table),
+ // we will try to uncache the InMemoryRelation associated with the
existing table.
+ cacheManager.tryUncacheQuery(table(tableName))
--- End diff --
Should we add `blocking = false` here?
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