Can`t build master of calcite.

[stanilovsky evgeny]

hi ! can`t build top of calcite (sha: commit  
74e97780add051cb71a122075e5bcbceb)

$ ./gradlew build
Task :core:compileJava
/home/zstan/work/repo/calcite/core/src/main/java/org/apache/calcite/prepare/PlannerImpl.java:39:  
warning: [deprecation]  
org.apache.calcite.rel.metadata.CachingRelMetadataProvider in  
org.apache.calcite.rel.metadata has been deprecated
import org.apache.calcite.rel.metadata.CachingRelMetadataProvider;
                                      ^
error: warnings found and -Werror specified
1 error
1 warning

do we need issue here?