from: flink-python
to: flink-java
evidence:
 - file: "flink-python/src/main/java/org/apache/flink/datastream/runtime/functions/python/PickledKeySelector.java"
   contains "import org.apache.flink.api.java.functions.KeySelector;"

from: flink-python
to: flink-java
evidence:
 - file: "flink-python/src/main/java/org/apache/flink/client/python/PythonFunctionFactory.java"
   contains "import org.apache.flink.api.java.ExecutionEnvironment;"

from: flink-python
to: flink-java
evidence:
 - file: "flink-python/src/main/java/org/apache/flink/client/python/PythonDriver.java"
   contains "import org.apache.flink.api.java.ExecutionEnvironment;"