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This patch adds a new MetaProvider called MultiMetaProvider, which is capable of handling multiple MetaProviders at once, prioritizing one primary provider over multiple secondary providers. The primary provider handles some methods exclusively for deterministic behavior. In database listings, if one database name occurs multiple times the contained tables are merged under that database name; if the two separate databases contain a table with the same name, the query analyzation fails with an error. This change also modifies the local catalog implementation's initialization. If catalogd is deployed, then it instantiates the CatalogdMetaProvider and checks if the catalog configuration directory is set as a backend flag. If it's set, then it tries to load every configuration from the folder, and tries to instantiate the IcebergMetaProvider from those configs. If the instantiation fails, an error is reported to the logs, but the startup is not interrupted. Tests: - E2E tests for multi-catalog behavior - Unit test for ConfigLoader Change-Id: Ifbdd0f7085345e7954d9f6f264202699182dd1e1 Reviewed-on: http://gerrit.cloudera.org:8080/22878 Tested-by: Impala Public Jenkins <impala-public-jenkins@cloudera.com> Reviewed-by: Zoltan Borok-Nagy <boroknagyz@cloudera.com>