Daniel Becker created IMPALA-12775:
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Summary: Check nullness in
SlotDescriptor::CodegenWriteCollectionStructChild
Key: IMPALA-12775
URL: https://issues.apache.org/jira/browse/IMPALA-12775
Project: IMPALA
Issue Type: Bug
Components: Backend
Reporter: Daniel Becker
In SlotDescriptor::CodegenWriteCollectionStructChild() we do not check whether
the struct (which is a child of a collection) is NULL. The code still works,
probably because if the struct is NULL then the NULL bits for its members are
also set, so we don't
try to read and copy invalid memory (for example the variable length part of a
STRING). But we still check all children for NULL-ness, which is extra work.
Note that this does not affect whether the struct is NULL in the result, this
function is called to make sure that the variable length data belonging to
children of arrays is copied correctly (recursively).
See
https://github.com/apache/impala/blob/00247c26e2a73d4ece4962be6fd5078843d938ae/be/src/runtime/descriptors.cc#L1475.
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