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  • org.apache.hive.jdbc.HiveConnection class: implements java.sql.Connection interface (part of JDBC). An instance of this class holds a reference to SessionHandle instance which is retrieved when making Thrift API calls to server.
  • org.apache.hive.jdbc.HiveStatement class: implements java.sql.Statement interface (part of JDBC). The client (e.g. beeline) calls the HiveStatement.execute() method for the query. Inside the execute() method, Thrift client is used to make API calls.
  • org.apache.hive.jdbc.HiveDriver class:  implements java.sql.Driver interface (part of JDBC). Core method is connect() which is used by JDBC client to initiate a SQL connection.

Interaction between client and server

  • org.apache.hive.service.cli.SessionHandle class: session identifier. instances Instances of this class are returned from server to client and used by client for as input for Thrift API calls.
  • org.apache.hive.service.cli.OperationHandle class: defines the operation handle which is part of Operation and used as a operation identifier. It's used by Thrift client to identifier. Instances of this class are returned from server and used by client to poll the execution status of an operation.