Fix issue with CASE/IIF pre-calculating results #49553
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Previously, CaseProcessor was pre-calculating (called process()) on all the building elements of a CASE/IIF expression, not only the conditions involved but also the results (if true/if false), as well as the final else result. In case one of those results had an erroneous calculation (e.g.: division by zero) this was executed and resulted in an Exception to be thrown, even if this result was not used because of the condition guarding it. e.g.: ``` SELECT CASE myField1 = 0 THEN NULL ELSE myField2 / myField1 END FROM test; ``` Fixes: elastic#49388
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Pinging @elastic/es-search (:Search/SQL) |
astefan
approved these changes
Nov 25, 2019
| List<Object> objects = new ArrayList<>(processors.size()); | ||
| for (Processor processor : processors) { | ||
| objects.add(processor.process(input)); | ||
| for (int i = 0; i < processors.size() - 2; i += 2) { |
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So, here you basically take a condition and you evaluate it, and if it holds then you evaluate its results and break out of the loop. If it doesn't hold (evaluates to false), then move on to the next set of [condition, result] and repeat the process. Can you add a comment about this, please?
| for (Processor processor : processors) { | ||
| objects.add(processor.process(input)); | ||
| for (int i = 0; i < processors.size() - 2; i += 2) { | ||
| if (processors.get(i).process(input)==Boolean.TRUE) { |
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processors.get(i).process(input) == Boolean.TRUE
matriv
added a commit
that referenced
this pull request
Nov 26, 2019
Previously, CaseProcessor was pre-calculating (called `process()`) on all the building elements of a CASE/IIF expression, not only the conditions involved but also the results, as well as the final else result. In case one of those results had an erroneous calculation (e.g.: division by zero) this was executed and resulted in an Exception to be thrown, even if this result was not used because of the condition guarding it. e.g.: ``` SELECT CASE myField1 = 0 THEN NULL ELSE myField2 / myField1 END FROM test; ``` Fixes: #49388 (cherry picked from commit dbd169a)
matriv
added a commit
that referenced
this pull request
Nov 26, 2019
Previously, CaseProcessor was pre-calculating (called `process()`) on all the building elements of a CASE/IIF expression, not only the conditions involved but also the results, as well as the final else result. In case one of those results had an erroneous calculation (e.g.: division by zero) this was executed and resulted in an Exception to be thrown, even if this result was not used because of the condition guarding it. e.g.: ``` SELECT CASE myField1 = 0 THEN NULL ELSE myField2 / myField1 END FROM test; ``` Fixes: #49388 (cherry picked from commit dbd169a)
matriv
added a commit
that referenced
this pull request
Nov 26, 2019
Previously, CaseProcessor was pre-calculating (called `process()`) on all the building elements of a CASE/IIF expression, not only the conditions involved but also the results, as well as the final else result. In case one of those results had an erroneous calculation (e.g.: division by zero) this was executed and resulted in an Exception to be thrown, even if this result was not used because of the condition guarding it. e.g.: ``` SELECT CASE myField1 = 0 THEN NULL ELSE myField2 / myField1 END FROM test; ``` Fixes: #49388 (cherry picked from commit dbd169a)
jpountz
changed the title
This was referenced Feb 3, 2020
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Previously, CaseProcessor was pre-calculating (called process())
on all the building elements of a CASE/IIF expression, not only the
conditions involved but also the results (if true/if false), as well as
the final else result. In case one of those results had an erroneous
calculation (e.g.: division by zero) this was executed and resulted in
an Exception to be thrown, even if this result was not used because of
the condition guarding it. e.g.:
Fixes: #49388