Flight SQL Ratification Based On Community Feedback #7 (apache#98)

* Remove scope from 'hamcrest' dependency on java/pom.xml

* Use flight top-level module on parent pom.xml instead of declaring each one

* Avoid using getStatement inside StatementContext methods

* Make StatementContext.getQuery() return String

* Minor fixes on pom.xml

* Move 'os-maven-plugin' to parent pom.xml

* Update protobuf generation on pom.xml files

* Use ClassLoader#getResource to get network.properties on TestFlightSql

* Bind to any ephemeral port on TestFlightSql

* Move JDBC-Arrow type default conversion from JdbcToArrowConfig to JdbcToArrowUtils

* Micro-optimization: initialize ArrayList with the right size

* Fix null-check on PreparedStatement#setParameters

* Avoid wrapping vector into a ImmutableList and then into an ArrayList on FlightSqlExample#getTablesRoot

* Remove null-check on VectorSchemaRoot on FlightSqlClient#setParameters()

* Remove the need of separate cache for ResultSets

* Add missing 'final' modifiers

java/pom.xml

@@ -506,6 +506,38 @@
             </lifecycleMappingMetadata>
           </configuration>
         </plugin>
+
+        <plugin>
+          <groupId>org.xolstice.maven.plugins</groupId>
+          <artifactId>protobuf-maven-plugin</artifactId>
+          <version>0.6.1</version>
+          <configuration>
+            <protocArtifact>com.google.protobuf:protoc:${dep.protobuf.version}:exe:${os.detected.classifier}</protocArtifact>
+            <pluginId>grpc-java</pluginId>
+            <pluginArtifact>io.grpc:protoc-gen-grpc-java:${dep.grpc.version}:exe:${os.detected.classifier}</pluginArtifact>
+          </configuration>
+          <executions>
+            <execution>
+              <id>proto-compile</id>
+              <phase>generate-sources</phase>
+              <configuration>
+                <protoSourceRoot>${basedir}/../format/</protoSourceRoot>
+              </configuration>
+              <goals>
+                <goal>compile</goal>
+                <goal>compile-custom</goal>
+              </goals>
+            </execution>
+            <execution>
+              <id>proto-test-compile</id>
+              <phase>generate-test-sources</phase>
+              <goals>
+                <goal>test-compile</goal>
+                <goal>test-compile-custom</goal>
+              </goals>
+            </execution>
+          </executions>
+        </plugin>
       </plugins>
     </pluginManagement>
   </build>