Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/14531#discussion_r74004679
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/command/tables.scala ---
@@ -80,13 +83,49 @@ case class CreateTableLikeCommand(
s"Source table in CREATE TABLE LIKE cannot be temporary:
'$sourceTable'")
}
- val tableToCreate = catalog.getTableMetadata(sourceTable).copy(
- identifier = targetTable,
- tableType = CatalogTableType.MANAGED,
- createTime = System.currentTimeMillis,
- lastAccessTime = -1).withNewStorage(locationUri = None)
+ val sourceTableDesc = catalog.getTableMetadata(sourceTable)
- catalog.createTable(tableToCreate, ifNotExists)
+ sourceTableDesc.tableType match {
+ case CatalogTableType.MANAGED | CatalogTableType.EXTERNAL |
CatalogTableType.VIEW => // OK
+ case o => throw new AnalysisException(
+ s"CREATE TABLE LIKE is not allowed when the source table is
${o.name}")
+ }
+
+ if (DDLUtils.isDatasourceTable(sourceTableDesc) &&
+ sourceTableDesc.tableType != CatalogTableType.MANAGED) {
+ throw new AnalysisException(
+ "CREATE TABLE LIKE is not allowed when the source table is an
external table created " +
+ "using the datasource API")
+ }
+
+ // For EXTERNAL_TABLE, the table properties has a particular field. To
change it
+ // to a MANAGED_TABLE, we need to remove it; Otherwise, it will be
EXTERNAL_TABLE,
+ // even if we set the tableType to MANAGED
+ //
(metastore/src/java/org/apache/hadoop/hive/metastore/ObjectStore.java#L1095-L1105)
+ // Table comment is stored as a table property. To clean it, we also
should remove them.
+ val newTableProp =
+ sourceTableDesc.properties.filterKeys(key => key != "EXTERNAL" &&
key != "comment")
+ val newSerdeProp =
+ if (DDLUtils.isDatasourceTable(sourceTableDesc)) {
+ val newPath = catalog.defaultTablePath(targetTable)
+ sourceTableDesc.storage.properties ++ Map("path" -> newPath)
+ } else {
+ sourceTableDesc.storage.properties
+ }
+ val newTableDesc =
+ sourceTableDesc.copy(
--- End diff --
I think it's more clear to list all the fields that need to retain in class
doc.
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