from: flink-clients
to: flink-optimizer
evidence:
 - file: "flink-clients/src/main/java/org/apache/flink/client/PlanTranslator.java"
   contains "import org.apache.flink.optimizer.costs.DefaultCostEstimator;"

from: flink-clients
to: flink-optimizer
evidence:
 - file: "flink-clients/src/main/java/org/apache/flink/client/program/PackagedProgramUtils.java"
   contains "import org.apache.flink.optimizer.CompilerException;"