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Code Issues

Fixed bug SF #562417

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(the fix is not obvious, so it should be properly tested)
This commit is contained in:
dimitr 2002-06-16 14:19:15 +00:00
parent f1d9211640
commit cd33516d1d
1 changed files with 12 additions and 2 deletions
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14
src/jrd/evl.cpp
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@ -19,7 +19,7 @@
*
* All Rights Reserved.
* Contributor(s): ______________________________________.
* $Id: evl.cpp,v 1.8 2002-06-14 12:09:36 dimitr Exp $
* $Id: evl.cpp,v 1.9 2002-06-16 14:19:14 dimitr Exp $
*/
/*
@ -1156,8 +1156,18 @@ BOOLEAN DLL_EXPORT EVL_field(register REL relation,
if ( (format = record->rec_format) )
*desc = format->fmt_desc[id];
/*
dimitr: fixed bug SF #562417
AFAIU, there was an assumption here that if a field descriptor is not
filled, then a field doesn't exist. This is not true, because in fact
an empty string has dsc_length = 0, and being part of an aggregate it
becomes nod_field with zero length, hence we had NULL as a result.
if (!format || id >= format->fmt_count || !desc->dsc_length) {
/* Map a non-existent field to a default value, if available.
*/
if (!format || id >= format->fmt_count || !desc->dsc_dtype) {
/* Map a non-existent field to a default value, if available.
* This enables automatic format upgrade for data rows.
* Handle Outer Joins and such specially!
* Reference: Bug 10424, 10116