wecharyu opened a new pull request, #5823:
URL: https://github.com/apache/hive/pull/5823

   ### What changes were proposed in this pull request?
   1. Calls `get_partitions_req` api to get all partitions to enable partition 
limit check
   2. Avoid calls `get_partitions_req` if not `dataWasMoved` 
   
   
   ### Why are the changes needed?
   Get all partitions of a table is a heavy operation that could affect both 
HMS server and backend DB, `alter_table` should also check and limit the 
fetched partition number.
   
   
   ### Does this PR introduce _any_ user-facing change?
   Yes, alter table cascade to large partitions may fail after this PR.
   
   ### How was this patch tested?
   Add a unit test:
   ```bash
   mvn test -Dtest.groups= 
-Dtest=org.apache.hadoop.hive.metastore.TestRemoteHiveMetaStore#testAlterTableCascadeExceedsPartitionLimits
 -pl :hive-standalone-metastore-server
   ```
   


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