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23 results

nodeHash.c

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    • Marc G. Fournier's avatar
      f796387b
      |From: Dan McGuirk <mcguirk@indirect.com> · f796387b
      Marc G. Fournier authored 
      |
|This patch fixes a backend crash that happens sometimes when you try to
|join on a field that contains NULL in some rows.  Postgres tries to
|compute a hash value of the field you're joining on, but when the field
|is NULL, the pointer it thinks is pointing to the data is really just
|pointing to random memory.  This forces the hash value of NULL to be 0.
|
|It seems that nothing matches NULL on joins, even other NULL's (with or
|without this patch).  Is that what's supposed to happen?
|
      f796387b
      History
      |From: Dan McGuirk <mcguirk@indirect.com>
      Marc G. Fournier authored 
      |
|This patch fixes a backend crash that happens sometimes when you try to
|join on a field that contains NULL in some rows.  Postgres tries to
|compute a hash value of the field you're joining on, but when the field
|is NULL, the pointer it thinks is pointing to the data is really just
|pointing to random memory.  This forces the hash value of NULL to be 0.
|
|It seems that nothing matches NULL on joins, even other NULL's (with or
|without this patch).  Is that what's supposed to happen?
|