Github user gatorsmile commented on a diff in the pull request:
https://github.com/apache/spark/pull/15996#discussion_r93298271
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/DataFrameWriter.scala ---
@@ -364,48 +365,149 @@ final class DataFrameWriter[T] private[sql](ds:
Dataset[T]) {
throw new AnalysisException("Cannot create hive serde table with
saveAsTable API")
}
- val tableExists =
df.sparkSession.sessionState.catalog.tableExists(tableIdent)
-
- (tableExists, mode) match {
- case (true, SaveMode.Ignore) =>
- // Do nothing
-
- case (true, SaveMode.ErrorIfExists) =>
- throw new AnalysisException(s"Table $tableIdent already exists.")
-
- case _ =>
- val existingTable = if (tableExists) {
-
Some(df.sparkSession.sessionState.catalog.getTableMetadata(tableIdent))
- } else {
- None
- }
- val storage = if (tableExists) {
- existingTable.get.storage
- } else {
- DataSource.buildStorageFormatFromOptions(extraOptions.toMap)
- }
- val tableType = if (tableExists) {
- existingTable.get.tableType
- } else if (storage.locationUri.isDefined) {
- CatalogTableType.EXTERNAL
- } else {
- CatalogTableType.MANAGED
+ val catalog = df.sparkSession.sessionState.catalog
+ val db = tableIdent.database.getOrElse(catalog.getCurrentDatabase)
+ val tableIdentWithDB = tableIdent.copy(database = Some(db))
+ val tableName = tableIdentWithDB.unquotedString
+
+ catalog.getTableMetadataOption(tableIdentWithDB) match {
+ // If the table already exists...
+ case Some(existingTable) =>
+ mode match {
+ case SaveMode.Ignore => // Do nothing
+
+ case SaveMode.ErrorIfExists =>
+ throw new AnalysisException(s"Table $tableName already exists.
You can set SaveMode " +
+ "to SaveMode.Append to insert data into the table or set
SaveMode to " +
+ "SaveMode.Overwrite to overwrite the existing data.")
+
+ case SaveMode.Append =>
+ if (existingTable.tableType == CatalogTableType.VIEW) {
+ throw new AnalysisException("Saving data into a view is not
allowed.")
+ }
+
+ if (existingTable.provider.get == DDLUtils.HIVE_PROVIDER) {
+ throw new AnalysisException(s"Saving data in the Hive serde
table $tableName is " +
+ s"not supported yet. Please use the insertInto() API as an
alternative.")
--- End diff --
Nit: this string interpolation is not needed.
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