Github user jianqiao commented on the issue:
https://github.com/apache/incubator-quickstep/pull/155
@zuyu It is expected that `statistics_` always gets initialized when a
`CatalogRelationSchema` gets constructed. Perhaps there is some change in your
branch that leaves this field uninitialized? You can add checks at different
stages (e.g. `ExecutionGenerator`, `SaveBlocksOperator::getAllWorkOrder` /
`SaveBlocksOperator::getAllWorkOrderProtos`) to see if the field is null.
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