Michael Ho created IMPALA-7338:
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Summary: Test coverage for codegen with CHAR type
Key: IMPALA-7338
URL: https://issues.apache.org/jira/browse/IMPALA-7338
Project: IMPALA
Issue Type: Task
Components: Backend
Affects Versions: Impala 2.12.0, Impala 3.0
Reporter: Michael Ho
Assignee: Bikramjeet Vig
Until IMPALA-3207 is fixed, we will disable codegen for operators if CHAR is
involved. Our test coverage for these cases is not very comprehensive. For
instance, we still hit cases such as IMPALA-7032, IMPALA-7288. This Jira aims
to track the effort to boost the test coverage for these cases.
Some ideas:
* augment existing test cases to make sure we cover all built-in expressions
which can take char type as argument or return type. This should help catch
cases such as IMPALA-7032
* exercise the bail out path in codegen functions (e.g. hash tables, exec
nodes, expressions) by injecting faults in expression codegen functions to fail
codegen. This should help catch cases such as IMPALA-7288.
* Make sure our query generator will generate all possible combination of
built-in expressions (with CHAR type) and all exec nodes which may codegen.
cc'ing [~mikesbrown] for query generator idea
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