[jira] [Created] (SPARK-20013) merge renameTable to alterTable in ExternalCatalog

["Song Jun (JIRA)" <ji...@apache.org>]

Song Jun created SPARK-20013:
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             Summary: merge renameTable to alterTable in ExternalCatalog
                 Key: SPARK-20013
                 URL: https://issues.apache.org/jira/browse/SPARK-20013
             Project: Spark
          Issue Type: Bug
          Components: SQL
    Affects Versions: 2.2.0
            Reporter: Song Jun


merge renameTable to alterTable in ExternalCatalog has some reasons:
1. In Hive, we rename a Table by alterTable
2. Currently when we create / rename a managed table, we should get the defaultTablePath for them in ExternalCatalog, then we have two defaultTablePath logic in its two subclass HiveExternalCatalog and InMemoryCatalog, additionally there is also a defaultTablePath in SessionCatalog, so till now we have three defaultTablePath in three classes. 
we'd better to unify them up to SessionCatalog

To unify them, we should move some logic from ExternalCatalog to SessionCatalog, renameTable is one of this.

while limit to the simple parameters in renameTable 
{code}
  def renameTable(db: String, oldName: String, newName: String): Unit
{code}
even if we move the defaultTablePath logic to SessionCatalog, we can not pass it to renameTable.

So we can merge the renameTable  to alterTable, and rename it in alterTable.



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