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Explain dropdb can't use syscache because of TOAST

Add a comment explaining dropdb() can't rely on syscache. The issue withflattened rows was fixed by commit0f92b23, but better to havea clear explanation why the systable scan is necessary. The other placesdoing in-place updates on pg_database have the same comment.Suggestion and patch by Yugo Nagata. Backpatch to 12, same as the fix.Author: Yugo NagataBackpatch-through: 12Discussion:https://postgr.es/m/CAJTYsWWNkCt+-UnMhg=BiCD3Mh8c2JdHLofPxsW3m2dkDFw8RA@mail.gmail.com

1 parent19021d2 commitde8770bCopy full SHA for de8770b

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src/backend/commands
- dbcommands.c

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`‎src/backend/commands/dbcommands.c‎`

Lines changed: 3 additions & 1 deletion

Original file line number	Diff line number	Diff line change
`@@ -1777,7 +1777,9 @@ dropdb(const char *dbname, bool missing_ok, bool force)`
`1777`	`1777`	`pgstat_drop_database(db_id);`
`1778`	`1778`
`1779`	`1779`	`/*`
`1780`		`- * Update the database's pg_database tuple`
	`1780`	`+ * Get the pg_database tuple to scribble on. Note that this does not`
	`1781`	`+ * directly rely on the syscache to avoid issues with flattened toast`
	`1782`	`+ * values for the in-place update.`
`1781`	`1783`	`*/`
`1782`	`1784`	`ScanKeyInit(&scankey,`
`1783`	`1785`	`Anum_pg_database_datname,`

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Commitde8770b

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`‎src/backend/commands/dbcommands.c‎`

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