Github user gatorsmile commented on a diff in the pull request:
https://github.com/apache/spark/pull/18824#discussion_r131056558
--- Diff:
sql/hive/src/main/scala/org/apache/spark/sql/hive/HiveExternalCatalog.scala ---
@@ -616,15 +616,24 @@ private[spark] class HiveExternalCatalog(conf:
SparkConf, hadoopConf: Configurat
// Add table metadata such as table schema, partition columns, etc. to
table properties.
val updatedTable = withNewSchema.copy(
properties = withNewSchema.properties ++
tableMetaToTableProps(withNewSchema))
+
+ // If it's a data source table, make sure the original schema is left
unchanged; the
+ // actual schema is recorded as a table property.
+ val tableToStore = if (DDLUtils.isDatasourceTable(updatedTable)) {
+ updatedTable.copy(schema = rawTable.schema)
--- End diff --
We do support `ALTER TABLE ADD COLUMN`, which relies on `alterTableSchema
`. The data source tables can be read by Hive if possible. Thus, I think we
should not set the schema unchanged.
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