[GitHub] amansinha100 commented on a change in pull request #1381: DRILL-6475: Unnest: Null fieldId Pointer.

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amansinha100 commented on a change in pull request #1381: DRILL-6475: Unnest: Null fieldId Pointer.
URL: https://github.com/apache/drill/pull/1381#discussion_r202530325
 
 

 ##########
 File path: exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/visitor/JoinPrelRenameVisitor.java
 ##########
 @@ -19,36 +19,70 @@
 
 import java.util.ArrayList;
 import java.util.List;
-
+import java.util.Map;
+import java.util.HashMap;
+
+import com.google.common.base.Preconditions;
+import org.apache.calcite.rel.type.RelDataType;
+import org.apache.calcite.rel.type.RelDataTypeField;
+import org.apache.calcite.rex.RexBuilder;
+import org.apache.calcite.rex.RexNode;
 import org.apache.drill.exec.planner.physical.JoinPrel;
 import org.apache.drill.exec.planner.physical.LateralJoinPrel;
 import org.apache.drill.exec.planner.physical.Prel;
 import org.apache.calcite.rel.RelNode;
 
 import com.google.common.collect.Lists;
+import org.apache.drill.exec.planner.physical.UnnestPrel;
 
 public class JoinPrelRenameVisitor extends BasePrelVisitor<Prel, Void, RuntimeException>{
 
+  private final Map<String, Prel> sourceOperatorRegistry = new HashMap();
+
   private static JoinPrelRenameVisitor INSTANCE = new JoinPrelRenameVisitor();
 
   public static Prel insertRenameProject(Prel prel){
     return prel.accept(INSTANCE, null);
   }
 
+  private void register(Prel toRegister) {
+    this.sourceOperatorRegistry.put(toRegister.getClass().getSimpleName(), toRegister);
 
 Review comment:
   It is odd to register the mapping of class name to the Prel.  The association of a LateralJoin to Unnest should ideally be done through instances of the class.  i.e  a particular Unnest instance is associated with a particular Lateral instance (each Lateral can be associated with multiple Unnest instances), otherwise there is potential for bugs due to incorrect association.    Thoughts ? 

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