[jira] [Created] (OLINGO-891) Use only two parameters in CONCAT function of JPA Where Expressions

["Jan Penninkhof (JIRA)" <ji...@apache.org>]

Jan Penninkhof created OLINGO-891:
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             Summary: Use only two parameters in CONCAT function of JPA Where Expressions
                 Key: OLINGO-891
                 URL: https://issues.apache.org/jira/browse/OLINGO-891
             Project: Olingo
          Issue Type: Bug
          Components: odata2-jpa
    Affects Versions: V2 2.0.6
            Reporter: Jan Penninkhof
             Fix For: V2 2.0.7


Substring filters such as the one below:

    $filter=(substringof(%27Jan%27,FirstName)

Are translated into JPA where clauses similar to:

    Where case when last_name like concat('%', 'Jan', '%') then 1 else 0 end=1 

However, not all database support concat functions with more than 2 parameters. The SAP Hana database is one of them.

I would propose to turn the where clause into:

    Where case when last_name like concat('%', concat('Jan', '%')) then 1 else 0 end=1

to get the clause to run on more database platforms.



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