Github user yhuai commented on a diff in the pull request: https://github.com/apache/spark/pull/15900#discussion_r88289294 --- Diff: sql/hive/src/main/scala/org/apache/spark/sql/hive/HiveExternalCatalog.scala --- @@ -1023,6 +1023,11 @@ object HiveExternalCatalog { // After SPARK-6024, we removed this flag. // Although we are not using `spark.sql.sources.schema` any more, we need to still support. DataType.fromJson(schema.get).asInstanceOf[StructType] + } else if (props.filterKeys(_.startsWith(DATASOURCE_SCHEMA_PREFIX)).isEmpty) { + // If there is no schema information in table properties, it means the schema of this table + // was empty when saving into metastore, which is possible in older version of Spark. We + // should respect it. + new StructType() --- End diff -- btw, this function is only needed for data source tables, right?
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