metastore_db
· A library for analyzing, processing, and rewriting views defined in the Hive Metastore, and sharing them across multiple execution engines
Download JD-GUI to open JAR file and explore Java source code file (.class .java)
Click menu "File → Open File..." or just drag-and-drop the JAR file in the JD-GUI window metastore_db-2.0.162.jar file.
Once you open a JAR file, all the java classes in the JAR file will be displayed.