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More pg_upgrade relfilenode C comments added.

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Bruce Momjian
2011-01-07 22:57:30 -05:00
parent 3095643d37
commit 2f657e4d72
2 changed files with 9 additions and 1 deletions
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contrib/pg_upgrade/pg_upgrade.c
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@ -19,7 +19,9 @@
* in a cluster, but they can diverge due to CLUSTER, REINDEX, or VACUUM
* FULL. The new cluster will have matching pg_class.oid and
* pg_class.relfilenode values and be based on the old oid value. This can
* cause the old and new pg_class.relfilenode values to differ.
* cause the old and new pg_class.relfilenode values to differ. In summary,
* old and new pg_class.oid and new pg_class.relfilenode will have the
* same value, and old pg_class.relfilenode might differ.
*
* We control all assignments of pg_type.oid because these oids are stored
* in user composite type values.