2017-03-31 Apache Calcite Avatica Avatica is a JDBC driver framework which is a part of Apache Calcite. Avatica is defined by a wire API between a client and a server. The Avatica server is an HTTP server, the Avatica client is a JDBC driver, and the wire API is defined by JSON or Protobuf Buffers. The flexibility of the wire API and HTTP transport allows other Avatica clients to be built in any language, implementing any client specification. Java Josh Elser