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commit    5c2a7c6e97741564ab4ff336eac8d8227485dd4c
Author:   Robert Haas <rhaas@postgresql.org>
Date:     Wed Jan 26 11:42:51 2011 +0000
First released in: 9.1.0

    Add a comment explaining why we force physical removal of OIDs.
    
    Noah Misch, slightly revised.


 src/backend/commands/tablecmds.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 8a281968ad8..8fa9d7fa7f1 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -4942,7 +4942,9 @@ ATExecDropColumn(List **wqueue, Relation rel, const char *colName,
 
 	/*
 	 * If we dropped the OID column, must adjust pg_class.relhasoids and tell
-	 * Phase 3 to physically get rid of the column.
+	 * Phase 3 to physically get rid of the column.  We formerly left the
+	 * column in place physically, but this caused subtle problems.  See
+	 * http://archives.postgresql.org/pgsql-hackers/2009-02/msg00363.php
 	 */
 	if (attnum == ObjectIdAttributeNumber)
 	{


[parent: a06e41deebdf]