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Offer triggers on foreign tables.

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This covers all the SQL-standard trigger types supported for regular
tables; it does not cover constraint triggers.  The approach for
acquiring the old row mirrors that for view INSTEAD OF triggers.  For
AFTER ROW triggers, we spool the foreign tuples to a tuplestore.

This changes the FDW API contract; when deciding which columns to
populate in the slot returned from data modification callbacks, writable
FDWs will need to check for AFTER ROW triggers in addition to checking
for a RETURNING clause.

In support of the feature addition, refactor the TriggerFlags bits and
the assembly of old tuples in ModifyTable.

Ronan Dunklau, reviewed by KaiGai Kohei; some additional hacking by me.
This commit is contained in:
Noah Misch
2014-03-23 02:16:34 -04:00
parent 6115480c54
commit 7cbe57c34d
14 changed files with 1145 additions and 202 deletions
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4
contrib/postgres_fdw/postgres_fdw.c
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@ -108,7 +108,7 @@ enum FdwScanPrivateIndex
* 1) INSERT/UPDATE/DELETE statement text to be sent to the remote server
* 2) Integer list of target attribute numbers for INSERT/UPDATE
* (NIL for a DELETE)
* 3) Boolean flag showing if there's a RETURNING clause
* 3) Boolean flag showing if the remote query has a RETURNING clause
* 4) Integer list of attribute numbers retrieved by RETURNING, if any
*/
enum FdwModifyPrivateIndex
@ -1246,7 +1246,7 @@ postgresPlanForeignModify(PlannerInfo *root,
*/
return list_make4(makeString(sql.data),
targetAttrs,
makeInteger((returningList != NIL)),
makeInteger((retrieved_attrs != NIL)),
retrieved_attrs);
}