oleksiy-sayankin commented on a change in pull request #2323:
URL: https://github.com/apache/hive/pull/2323#discussion_r640409691
##########
File path:
standalone-metastore/metastore-server/src/main/java/org/apache/hadoop/hive/metastore/ObjectStore.java
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@@ -5269,6 +5293,32 @@ private void preDropStorageDescriptor(MStorageDescriptor
msd) {
removeUnusedColumnDescriptor(mcd);
}
+ /**
+ * Get a list of storage descriptors that reference a particular Column
Descriptor
+ * @param oldCD the column descriptor to get storage descriptors for
+ * @return a list of storage descriptors
+ */
+ private List<MStorageDescriptor>
listStorageDescriptorsWithCD(MColumnDescriptor oldCD, Query query) {
+ boolean success = false;
+ List<MStorageDescriptor> sds = null;
+ try {
+ openTransaction();
Review comment:
And what do you think of method _listStorageDescriptorsWithCD_? It also
uses open/commit transaction and If I implement open/commit transaction in
_removeUnusedColumnDescriptor()_ it seems to be like this
removeUnusedColumnDescriptor(){
openTransaction()
if (isPostgres()) {
listStorageDescriptorsWithCD {
openTransaction() <--- do we need this?
1. SELECT * FROM "SDS" "A0" WHERE "A0"."CD_ID" = $1 limit 1)
commitTransaction() <--- do we need this?
}
}
2. select count(1) from
org.apache.hadoop.hive.metastore.model.MStorageDescriptor where (this.cd ==
inCD)
3. pm.deletePersistentAll(mConstraintsList);
4. pm.deletePersistent(oldCD);
commitTransaction()
}
so open/commit transaction inside _listStorageDescriptorsWithCD()_ is
redundant. Agree?
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