sqlind wrong segnalation of null value
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                 Key: CORE-3961
                 URL: http://tracker.firebirdsql.org/browse/CORE-3961
             Project: Firebird Core
          Issue Type: Bug
          Components: API / Client Library
    Affects Versions: 2.1.5, 2.5.1, 2.5.0
         Environment: client windows, server freebsd or windows
            Reporter: Lorenzo Iania


Sometimes, in unpredictable situation, using a query involving more fields , it 
happens that the first field (and only the first one) in the sqlda structure, 
returns null value (sqlind= -1) when the data is not null and also when the 
field has not null property. I cannot explain it clearly because it happens 
only sometimes, but when it happens, if you repeat the same query, the 
behaviour is always the same. Sometimes, to resolve the problem, i had to 
ignore the sqlind flag, because the data is correctly inserted in the sqldata 
pointer. Furthermore, using the same client library and the same application 
from different clients, it happens that the behaviour is different: on the 
first client the problem is always the same, but on the second the result is 
perfect. The error involves always the first field in the query.


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