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Add a comment explaining why we force physical removal of OIDs.

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Noah Misch, slightly revised.
This commit is contained in:
Robert Haas
2011-01-26 06:42:51 -05:00
parent a06e41deeb
commit 5c2a7c6e97
1 changed files with 3 additions and 1 deletions
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4
src/backend/commands/tablecmds.c
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@ -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 * 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) if (attnum == ObjectIdAttributeNumber)
{ {