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.
- 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
- 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
- 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