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Add infrastructure for mapping relfilenodes to relation OIDs.
Future patches are expected to introduce logical replication that works by decoding WAL. WAL contains relfilenodes rather than relation OIDs, so this infrastructure will be needed to find the relation OID based on WAL contents. If logical replication does not make it into this release, we probably should consider reverting this, since it will add some overhead to DDL operations that create new relations. One additional index insert per pg_class row is not a large overhead, but it's more than zero. Another way of meeting the needs of logical replication would be to the relation OID to WAL, but that would burden DML operations, not only DDL. Andres Freund, with some changes by me. Design review, in earlier versions, by Álvaro Herrera.
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@ -460,6 +460,7 @@ extern Datum pg_size_pretty_numeric(PG_FUNCTION_ARGS);
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extern Datum pg_table_size(PG_FUNCTION_ARGS);
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extern Datum pg_indexes_size(PG_FUNCTION_ARGS);
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extern Datum pg_relation_filenode(PG_FUNCTION_ARGS);
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extern Datum pg_filenode_relation(PG_FUNCTION_ARGS);
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extern Datum pg_relation_filepath(PG_FUNCTION_ARGS);
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/* genfile.c */
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