[Backport 1.17] fix: Unary-test behavior with special input variable ?
#905
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Add test cases to explicitly verify that a unary-test expression returns the correct output (true/false/null). Restructure existing tests cases and group them into the different behaviors. (cherry picked from commit 866ce00)
Introduce a new type for not recoverable errors. Compared to the existing error, this new error should stop the evaluation instead of continue the evaluation with null. (cherry picked from commit 04abac9)
Correct the behavior of unary-test expression to return only true if an expression with the special variable `?` evaluates to true. Identify the usage by returning a fatal error if `?` is used outside of an unary-test. (cherry picked from commit 61cb169)
Adjust all operations to return a fatal error instead of returning null. This is required to limit the access to the special input symbol `?` outside an unary-tests. Restructure some helper methods to restrict the handling of fatal errors to a few places. This should help to reduce possible problems with fatal errors. Move some methods to group different aspects together. (cherry picked from commit c967208)
(cherry picked from commit 1ba21ca)
(cherry picked from commit f171ebf)
Add a test case to verify that the input variable is not available outside of an unary-test expression. (cherry picked from commit 8354d1b)
(cherry picked from commit 63efe64)
(cherry picked from commit ac4737b)
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Description
Backport of #887 to
1.17.relates to #864
original author: @saig0