On Sun, May 14, 2017 at 5:35 PM, Ildus Kurbangaliev
<i.kurbangal...@postgrespro.ru> wrote:
> TRAP: FailedAssertion("!(((const void*)(fdw_trigtuple) != ((void *)0))
> ^ ((bool) (((const void*)(tupleid) != ((void *)0)) &&
> ((tupleid)->ip_posid != 0))))", File: "trigger.c", Line: 2428)
> I'm not sure how it should be fixed, because as I see `oldtuple` will
> be set only for AFTER ROW triggers by `wholerow` junk attribute.

There is comment on the ExecUpdate function

 *  When updating a foreign table,
 * tupleid is invalid; the FDW has to figure out which row to
 * update using data from the planSlot.  oldtuple is passed to
 * foreign table triggers; it is NULL when the foreign table has
 * no relevant triggers.

After your fix, now tupleid is invalid which is expected, but seems
like we need to do something more. As per the comments seems like it
is expected to get the oldtuple from planSlot.  But I don't see any
code for handling that part.

Dilip Kumar
EnterpriseDB: http://www.enterprisedb.com

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