Provide name of udf function for "arithmetic exception, numeric overflow, or 
string truncation"
-----------------------------------------------------------------------------------------------

                 Key: CORE-5876
                 URL: http://tracker.firebirdsql.org/browse/CORE-5876
             Project: Firebird Core
          Issue Type: New Feature
          Components: Engine
    Affects Versions: 3.0.4
            Reporter: Karol Bieniaszewski


This is important to know the reason of the error  - especially if it is caused 
by udf function

DECLARE EXTERNAL FUNCTION SUBSTR
CSTRING(80), Smallint, Smallint
RETURNS CSTRING(80)
ENTRY_POINT 'IB_UDF_substr'
MODULE_NAME 'ib_udf.dll';

-----------------------------------------------------------------

SELECT SUBSTR(CAST('abc' AS CHAR(1500)) || '123', 1, 1000) FROM RDB$DATABASE

-----------------------------------------------------------------


SQL Message : -802
Arithmetic overflow or division by zero has occurred.

Engine Code    : 335544321
Engine Message :
arithmetic exception, numeric overflow, or string truncation
string right truncation
expected length 80, actual 1503


-----------------------------------------------------------------
for not udf functions we have name of problematic function "At function 'BBB' 
line: 6, col: 1"


SQL Message : -802
Arithmetic overflow or division by zero has occurred.

Engine Code    : 335544321
Engine Message :
arithmetic exception, numeric overflow, or string truncation
string right truncation
expected length 100, actual 103
At function 'BBB' line: 6, col: 1










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