Commitecf7a2e

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Add pg_upgrade C comment about why we check all relkinds for regtypes.

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Original file line number	Diff line number	Diff line change
`@@ -644,6 +644,11 @@ check_for_reg_data_type_usage(ClusterInfo *cluster)`
`644`	`644`	`DbInfo*active_db=&cluster->dbarr.dbs[dbnum];`
`645`	`645`	`PGconn*conn=connectToServer(cluster,active_db->db_name);`
`646`	`646`
	`647`	`+/*`
	`648`	`+ *While several relkinds don't store any data, e.g. views, they`
	`649`	`+ *can be used to define data types of other columns, so we`
	`650`	`+ *check all relkinds.`
	`651`	`+ */`
`647`	`652`	`res=executeQueryOrDie(conn,`
`648`	`653`	`"SELECT n.nspname, c.relname, a.attname "`
`649`	`654`	`"FROMpg_catalog.pg_class c, "`

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