Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/15024#discussion_r79189646
--- Diff:
sql/hive/src/main/scala/org/apache/spark/sql/hive/HiveExternalCatalog.scala ---
@@ -409,16 +416,31 @@ private[spark] class HiveExternalCatalog(conf:
SparkConf, hadoopConf: Configurat
}
if (DDLUtils.isDatasourceTable(withStatsProps)) {
- val oldDef = client.getTable(db, withStatsProps.identifier.table)
- // Sets the `schema`, `partitionColumnNames` and `bucketSpec` from
the old table definition,
- // to retain the spark specific format if it is. Also add old data
source properties to table
- // properties, to retain the data source table format.
- val oldDataSourceProps =
oldDef.properties.filter(_._1.startsWith(DATASOURCE_PREFIX))
+ val oldTableDef = client.getTable(db,
withStatsProps.identifier.table)
+
+ val oldLocation =
oldTableDef.properties.getOrElse(DATASOURCE_LOCATION,
+ oldTableDef.storage.locationUri.get)
+ // Only update the `locationUri` field if the location is really
changed.
+ val newLocation = if (oldLocation ==
tableDefinition.storage.locationUri.get) {
--- End diff --
This is to keep the previous behaviour.
Previously, if we alter table fields (exclude location), we will keep the
`locationUri` field and `path` option unchanged. If we alter table location, we
will update both the `locationUri` field and `path` option, although it's
dangerous to set `locationUri` as the path may be a file path.
Now, if we alter table fields (exclude location), we will keep the
`locationUri` field unchanged, although the `locationUri` field may be
different from the one in old raw table(the `oldTableDef` get from hive client
directly) due to the hacks in `saveTableIntoHive`. If we alter table location,
we will update the `locationUri` field even it's file path, same as before.
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