fix(mango): improve handling of unsatisfiable ranges in selectors
#4568
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Certain configurations of unsatisfiable field ranges could cause
HTTP 500 because they are not handled, for example:
{"$and": [{"field": {"$eq": N}}, {"field": {"$gt": N}}]}
This makes `mango_idx_view:end_key/1` fail because there is no
clause to cover `[{'$gt',35,'$eq',35}]`, the value that the
selector becomes mapped to.
Similar field ranges are somewhat already handled by being mapped
to `empty` so this seems to be an oversight in the original
implementation. Consider the following case, which will not
crash on the contrary:
{"$and": [{"field": {"$gt": N}}, {"field": {"$eq": N}}]}
Add the missing function clauses to fix this problem.
Found by: random query generation
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Certain configurations of unsatisfiable field ranges could cause HTTP 500 because they are not handled, for example:
{"$and": [{"field": {"$eq": N}}, {"field": {"$gt": N}}]}This makes
mango_idx_view:end_key/1fail because there is no clause to cover[{'$gt',35,'$eq',35}], the value that the selector becomes mapped to.Similar field ranges are somewhat already handled by being mapped to
emptyso this seems to be an oversight in the original implementation. Consider the following case, which will not crash on the contrary:{"$and": [{"field": {"$gt": N}}, {"field": {"$eq": N}}]}Add the missing function clauses to fix this problem.
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