[HACKERS] ¿¿¿past chunk end???

[luis garcia]

Hi We have been making some modifications to postgres catalog, but
it seems to be a problem with one of the fields we just added, exactly
in the time when inserting the right values to that specific field.

1. This is what It happens:

**************************************
template1=# CREATE TABLE test() AS VALID EVENT 2 WITH FREQUENCY '00:00:50.00' AS REAL TIME;
WARNING:  detected write past chunk end in CacheMemoryContext 0xb7212e0c
CREATE TABLE
**************************************

The creation it's possible, in fact, We have added 7 fields to Postgres
catalog (in pg_class) and there are no problems with the other fields values,
just with this one.


2. The field is defined this way:
// FILE: Parsenodes.h
// STRUCTURE: frequencyDefinition

typedef struct FrequencyDefinition
{
    NodeTag        type;
    bool        timeFrequency;
    FrequencyType    fttype;
    const char    *frequencyMeasure; // THIS ONE
} FrequencyDefinition;


3. The values are inserted this way:
// FILE: relcache.c
// FUNCTION: RelationBuildLocalRelation

**************************************
rel->rd_rel->relhasfrequency = freqDef->timeFrequency;  // Perfect Asignation

if((freqDef->fttype) == REAL_TIME)
            namestrcpy(&rel->rd_rel->relfrequencytype,(const char *)"REAL TIME");
        else
            namestrcpy(&rel->rd_rel->relfrequencytype,(const char *)"HISTORIC");

namestrcpy(&rel->rd_rel->relfrequency,freqDef->frequencyMeasure)
**************************************


We can see the other values whit a SELECT over PG_CLASS:

template1=# SELECT relname, relhasfrequency, relfrequencytype, relfrequency FROM pg_class WHERE relhasfrequency=true;

 relname  | relhasfrequency | relfrequencytype | relfrequency
 - - - - - -  + - - - - - - - - - - - - + - - - - - - - - - - - - - + - - - - - - - - -
 test         | t                        | REAL TIME          | 0
(1 row)

We have realized that in the assignation it takes just the first CHAR from '00:00:50.00',
and we tested the same assignation but just like this:

***************************************
namestrcpy(&rel->rd_rel->relfrequencytype,freqDef->frequencyMeasure);
//namestrcpy(&rel->rd_rel->relfrequency,freqDef->frequencyMeasure)
***************************************

And the result to the same query was:

template1=# SELECT relname, relhasfrequency, relfrequencytype, relfrequency FROM pg_class WHERE relhasfrequency=true;

 relname  | relhasfrequency | relfrequencytype | relfrequency
 - - - - - -  + - - - - - - - - - - - - + - - - - - - - - - - - - - + - - - - - - - - -
 test         | t                        | '00:00:50.00'         | 0
(1 row)


So please, anybody could tell me how to fix this?

Thanks...
--
Luis D. García M.
Telf: 0414-3482018

- FACYT - UC -
- Computación -