[GitHub] [pinot] siddharthteotia commented on a diff in pull request #9064: [multistage] Fix data block transfer semantics and plan node data schema usage.

[GitBox]

siddharthteotia commented on code in PR #9064:
URL: https://github.com/apache/pinot/pull/9064#discussion_r927840351


##########
pinot-query-runtime/src/main/java/org/apache/pinot/query/runtime/blocks/TransferableBlockUtils.java:
##########
@@ -19,33 +19,28 @@
 package org.apache.pinot.query.runtime.blocks;
 
 import org.apache.pinot.common.utils.DataSchema;
-import org.apache.pinot.common.utils.DataTable;
-import org.apache.pinot.core.common.datablock.BaseDataBlock;
 import org.apache.pinot.core.common.datablock.DataBlockUtils;
+import org.apache.pinot.core.common.datablock.MetadataBlock;
 
 
 public final class TransferableBlockUtils {
   private TransferableBlockUtils() {
     // do not instantiate.
   }
-  private static final TransferableBlock EOS_TRANSFERABLE_BLOCK =
-      new TransferableBlock(DataBlockUtils.getEndOfStreamDataBlock());
 
-  public static TransferableBlock getEndOfStreamTransferableBlock() {
-    return EOS_TRANSFERABLE_BLOCK;
+  public static TransferableBlock getEndOfStreamTransferableBlock(DataSchema 
dataSchema) {
+    return new TransferableBlock(DataBlockUtils.getEmptyDataBlock(dataSchema));
   }
 
   public static TransferableBlock getErrorTransferableBlock(Exception e) {
     return new TransferableBlock(DataBlockUtils.getErrorDataBlock(e));
   }
 
-  public static TransferableBlock getEmptyTransferableBlock(DataSchema 
dataSchema) {
-    return new TransferableBlock(DataBlockUtils.getEmptyDataBlock(dataSchema));
+  public static TransferableBlock repackErrorBlock(MetadataBlock 
upstreamErrorBlock) {
+    return new 
TransferableBlock(DataBlockUtils.getErrorDataBlock(upstreamErrorBlock.getExceptions()));

Review Comment:
   Why can't we return the error block as is to downstream operators ?



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