Github user vanzin commented on a diff in the pull request: https://github.com/apache/spark/pull/18824#discussion_r131015612 --- 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) + } else { + updatedTable + } + try { - client.alterTable(updatedTable) + client.alterTable(tableToStore) } catch { case NonFatal(e) => val warningMessage = s"Could not alter schema of table ${rawTable.identifier.quotedString} in a Hive " + "compatible way. Updating Hive metastore in Spark SQL specific format." logWarning(warningMessage, e) - client.alterTable(updatedTable.copy(schema = updatedTable.partitionSchema)) + client.alterTable(updatedTable.copy(schema = tableToStore.partitionSchema)) --- End diff -- This is the exception handling code I mentioned in the bug report which seems very suspicious. I had half a desire to just remove it, but maybe someone can explain to me why this code makes sense.
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