Github user liancheng commented on a diff in the pull request:
https://github.com/apache/spark/pull/4060#discussion_r23796102
--- Diff: sql/core/src/main/scala/org/apache/spark/sql/sources/ddl.scala ---
@@ -231,6 +241,32 @@ private [sql] case class CreateTempTableUsing(
}
}
+private[sql] case class DropTable(
+ tableName: String,
+ isExists: Boolean,
+ temporary: Boolean) extends Command
+
+private[sql] case class DropTempTable(
+ tableName: String,
+ isExists: Boolean,
+ temporary: Boolean) extends RunnableCommand {
+
+ def run(sqlContext: SQLContext) = {
+ val tableExists = sqlContext.catalog.tableExists(Seq(tableName))
+ if (isExists) {
+ if (tableExists) sqlContext.dropTempTable(tableName)
+ else logWarning(s"Unknown table '${tableName}'")
+ }
+ // no `IF EXISTS` keyword, will thorw an exception
+ else {
+ if (tableExists) sqlContext.dropTempTable(tableName)
+ else sys.error(s"Unknown table '${tableName}'")
--- End diff --
Omit the braces.
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