Correctly handle order by aliases. #2516
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fixes spring-projects#2260 related to c93aa25 In order to correctly identify aliases in the order by clause, we cannot process the from clauses left-to-right using regular expressions. These must be removed inner-to-outer. Commit c93aa25 resulted in a bug where the subquery would be incorrectly identified as the alias, as by the following query: ``` from Parent p join p.children c where not c.id not in (select c2.id from Child c2) ``` Passing in a Sort.by("name") would result in "order by c2.name" instead of "order by p.name". Thus, it was using the alias of the inner query instead of the outer query. [This comment](spring-projects#2260 (comment)) suggests removing the content of the inner query, with the caveat of the entire query being surrounded by parenthesis. This commit does exactly that, by removing the subquery before the alias is identified. It also handles the case when the entire query is surrounded by parenthesis. Unit tests illustrate this along with several examples of removing the subquery to correctly identify the alias for the order by clause.
spring-projects-issues
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status: waiting-for-triage
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Thanks @darinmanica! |
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Merged to |
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Backported to 2.7.x., 2.6.x, and 2.5.x. |
gregturn
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type: bug
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Correctly handle order by aliases.
fixes #2260 related to c93aa25
fixes #2500
fixes #2518
In order to correctly identify aliases in the order by clause, we cannot process the from clauses left-to-right using regular expressions. These must be removed inner-to-outer. Commit c93aa25 resulted in a bug where the subquery would be incorrectly identified as the alias, as by the following query:
Passing in a Sort.by("name") would result in "order by c2.name" instead of "order by p.name". Thus, it was using the alias of the inner query instead of the outer query. This comment suggests removing the content of the inner query, with the caveat of the entire query being surrounded by parenthesis. This commit does exactly that, by removing the subquery before the alias is identified. It also handles the case when the entire query is surrounded by parenthesis. Unit tests illustrate this along with several examples of removing the subquery to correctly identify the alias for the order by clause.