From: Bruce Momjian <bruce@momjian.us>
Date: Sat, 30 Aug 2014 14:24:34 +0000 (-0400)
Subject: Again update C comments for pg_attribute.attislocal
X-Git-Tag: REL9_5_ALPHA1~1537
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=d5d7d07765443175a49441bad7a799dedc072511;p=postgresql

Again update C comments for pg_attribute.attislocal
---

diff --git a/src/include/catalog/pg_attribute.h b/src/include/catalog/pg_attribute.h
index 1bd42a8410..391d568773 100644
--- a/src/include/catalog/pg_attribute.h
+++ b/src/include/catalog/pg_attribute.h
@@ -137,9 +137,13 @@ CATALOG(pg_attribute,1249) BKI_BOOTSTRAP BKI_WITHOUT_OIDS BKI_ROWTYPE_OID(75) BK
 	bool		attisdropped;
 
 	/*
-	 * Has a local definition (hence, do not drop when attinhcount is 0)
-	 * This is set and remains set if the column was _ever_
-	 * local/not-inherited, e.g. this can be set by ALTER TABLE NO INHERIT.
+	 * This flag specifies whether this column has ever had a local
+	 * definition.  It is set for normal non-inherited columns, but also
+	 * for columns that are inherited from parents if also explicitly listed
+	 * in CREATE TABLE INHERITS.  It is also set when inheritance is removed
+	 * from a table with ALTER TABLE NO INHERIT.  If the flag is set, the
+	 * column is not dropped by a parent's DROP COLUMN even if this causes
+	 * the column's attinhcount to become zero.
 	 */
 	bool		attislocal;