tree b309d1f3d96846aa9ca4bad24a2bff68f0feb42b
parent 023e92f5e7b9f9a722db34bc738607aeae10a07a
author Anurag Mantripragada <anurag@cloudera.com> 1576536457 -0800
committer Impala Public Jenkins <impala-public-jenkins@cloudera.com> 1579318597 +0000

IMPALA-9158: Support loading primary key/foreign key constraints
in LocalCatalog Mode.

This change add a new method 'loadConstraints()' to the MetaProvider
interface.

1. In CatalogdMetaProvider implementation, we fetch the primary key
  (PK) and foreign key(FK) information via the GetPartialCatalogObject()
  RPC to the catalogd. This is modified to include PK/FK information.
  This is because, on catalog side we eagerly load PK/FK information
  which can be sent over to local catalog in a single RPC to Catalog.
  This information is then stored in TableMetaRef object for future
  consumers.
2. In the DirectMetaProvider implementation, we make two RPCs to HMS
  to directly get PK/FK information.

Load constraints can be extended to include other constraints later
(for ex: unique constraints.)

Testing:
- Added tests in LocalCatalogTest, CatalogTest and PartialCatalogInfoTest
- This change also modifies the toSqlUtil for show create table
  statements. Added a test for the same.

Change-Id: I7ea7e1bacf6eb502c67caf310a847b32687e0d58
Reviewed-on: http://gerrit.cloudera.org:8080/14731
Reviewed-by: Impala Public Jenkins <impala-public-jenkins@cloudera.com>
Tested-by: Impala Public Jenkins <impala-public-jenkins@cloudera.com>