Github user hvanhovell commented on a diff in the pull request:
https://github.com/apache/spark/pull/13170#discussion_r63915008
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/command/tables.scala ---
@@ -271,6 +274,55 @@ case class LoadData(
}
/**
+ * A command to truncate table.
+ *
+ * The syntax of this command is:
+ * {{{
+ * TRUNCATE TABLE tablename [PARTITION (partcol1=val1, partcol2=val2 ...)]
+ * }}}
+ */
+case class TruncateTable(
+ tableName: TableIdentifier,
+ partitionSpec: Option[TablePartitionSpec]) extends RunnableCommand {
+
+ override def run(sparkSession: SparkSession): Seq[Row] = {
+ val catalog = sparkSession.sessionState.catalog
+ if (!catalog.tableExists(tableName)) {
+ logWarning(s"table '$tableName' in TRUNCATE TABLE does not exist.")
+ } else if (catalog.isTemporaryTable(tableName)) {
+ logWarning(s"table '$tableName' in TRUNCATE TABLE is a temporary
table.")
+ } else {
+ val locations = if (partitionSpec.isDefined) {
+ catalog.listPartitions(tableName,
partitionSpec).map(_.storage.locationUri)
+ } else {
+ val table = catalog.getTableMetadata(tableName)
+ if (table.partitionColumnNames.nonEmpty) {
+ catalog.listPartitions(tableName).map(_.storage.locationUri)
+ } else {
+ Seq(table.storage.locationUri)
+ }
+ }
+ val hadoopConf = sparkSession.sessionState.newHadoopConf()
+ locations.foreach { location =>
+ if (location.isDefined) {
+ val path = new Path(location.get)
+ try {
+ val fs = path.getFileSystem(hadoopConf)
+ fs.delete(path, true)
+ fs.mkdirs(path)
+ } catch {
+ case NonFatal(e) =>
+ throw new AnalysisException(
+ s"Failed to truncate table '$tableName' because of
${e.toString}")
--- End diff --
Minor: add location to the error string. Unless you are sure the exception
message contains it.
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