Error detected in base64 query when using multi stage engine

[gortiz]

Trying to improve the coverage on multi stage engine I've found that this query fails while doesn't fail in V1. It may be the case that this is not an actual error and V1 was too generous with it, but just in case, I'm creating this PR in order to make it easier for @xiangfu0 or @Jackie-Jiang to verify that.

The error shown is:

QueryExecutionError:
  java.lang.RuntimeException: Error executing query: [0]@192.168.1.34:52432 MAIL_RECEIVE(RANDOM_DISTRIBUTED)
  └── [1]@localhost:52440 MAIL_SEND(RANDOM_DISTRIBUTED)->{[0]@192.168.1.34@{52432,52432}|[0]}
    └── [1]@localhost:52440 SORT LIMIT 10
      └── [1]@localhost:52440 MAIL_RECEIVE(HASH_DISTRIBUTED)
        └── [2]@localhost:52440 MAIL_SEND(HASH_DISTRIBUTED)->{[1]@localhost@{52440,52441}|[0]}
    ...
Caused by: java.lang.RuntimeException: 
Received error query execution result block: {1000=Unable to extract from container with type: METADATA
  java.lang.UnsupportedOperationException: Unable to extract from container with type: METADATA
    at org.apache.pinot.query.runtime.blocks.TransferableBlock.getContainer(TransferableBlock.java:94)
    at org.apache.pinot.query.runtime.operator.SortOperator.consumeInputBlocks(SortOperator.java:156)
    at org.apache.pinot.query.runtime.operator.SortOperator.getNextBlock(SortOperator.java:114)

[gortiz]

Fixed in #11453