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Document cross-version compatibility issues for contrib/postgres_fdw.
One of the use-cases for postgres_fdw is extracting data from older PG servers, so cross-version compatibility is important. Document what we can do here, and further annotate some of the coding choices that create compatibility constraints. In passing, remove one unnecessary incompatibility with old servers, namely assuming that we didn't need to quote the timezone name 'UTC'.
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@ -801,6 +801,9 @@ postgresGetForeignPlan(PlannerInfo *root,
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* The extra roundtrips involved in trying to duplicate the local
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* semantics exactly don't seem worthwhile (see also comments for
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* RowMarkType).
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*
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* Note: because we actually run the query as a cursor, this assumes that
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* DECLARE CURSOR ... FOR UPDATE is supported, which it isn't before 8.3.
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*/
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if (baserel->relid == root->parse->resultRelation &&
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(root->parse->commandType == CMD_UPDATE ||
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