Holder class that contains batch naming, batch and record index. Batch index is used when batch is hyper container.
Used to distinguish batches in non-equi conditions during expression materialization.
Mostly used for nested loop join which allows non equi-join.
BatchReference instance can be created during batch initialization
(ex: instance of
AbstractRecordBatch)
since naming of batches used won't change during data processing.
Though information from batch reference will be used during schema build (i.e. once per OK_NEW_SCHEMA).
Example:
BatchReference{batchName='leftBatch', batchIndex='leftIndex', recordIndex='leftIndex'}
BatchReference{batchName='rightContainer', batchIndex='rightBatchIndex', recordIndex='rightRecordIndexWithinBatch'}