Tim Armstrong created IMPALA-7366:
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Summary: Remove MarkNeedsDeepCopy() from UnionNode
Key: IMPALA-7366
URL: https://issues.apache.org/jira/browse/IMPALA-7366
Project: IMPALA
Issue Type: Sub-task
Components: Backed
Reporter: Tim Armstrong
This case is a bit trickier than the others. The issue is that some plan nodes,
like HdfsScanNode, hold onto memory that is referenced by returned batches and
don't necessarily attach the memory before returning *eos.
E.g. if you have a scan with a limit feeding into a UnionNode, the scan may
terminate earlier before it attaches all memory to its output batches, then
HdfsScanNode::Close() will free that memory. Thus it's not safe for the
UnionNode to close its child until all referenced data has been copied out.
The fix is either to attach the memory to the final batch in Close() or to have
a new method like FlushResources() that is called before Close().
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