Protobuf 3.x necessary for Calcite.

Author: LorenzBuehmann

sansa-inference-common/pom.xml

@@ -78,6 +78,12 @@
       <groupId>org.apache.calcite</groupId>
       <artifactId>calcite-core</artifactId>
     </dependency>
+    <dependency>
+      <groupId>com.google.protobuf</groupId>
+      <artifactId>protobuf-java</artifactId>
+      <version>3.3.1</version>
+    </dependency>
+
 
     <!-- Test -->
     <dependency>