Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/16944#discussion_r103048200
--- Diff:
sql/hive/src/main/scala/org/apache/spark/sql/hive/HiveExternalCatalog.scala ---
@@ -510,8 +510,13 @@ private[spark] class HiveExternalCatalog(conf:
SparkConf, hadoopConf: Configurat
requireTableExists(db, tableDefinition.identifier.table)
verifyTableProperties(tableDefinition)
+ // Add table metadata such as table schema, partition columns, etc. if
they aren't already
+ // present.
+ val withMetaProps = tableDefinition.copy(
--- End diff --
`alterTable` assumes we won't alter table schema(see the doc of
`alterTable`), and I'm not sure if we can just put the schema into table
properties and alter it.
I'd like to create a new method `def alterSchema(db: String, table: String,
schema: StructType)`, which reads the raw hive table, put table schema into
table properties and alter it.
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