From: amit <amitlangote09@gmail.com>
Date: Fri, 10 Feb 2017 15:03:45 +0900
Subject: [PATCH 4/4] Add a note about DROP NOT NULL and partitions

On the ALTER TABLE refpage, it seems better to mention how to drop
drop the not null constraint of a partition's column.  Per suggestion
from Corey Huinker.
---
 doc/src/sgml/ref/alter_table.sgml | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/doc/src/sgml/ref/alter_table.sgml b/doc/src/sgml/ref/alter_table.sgml
index da431f8369..be857882bb 100644
--- a/doc/src/sgml/ref/alter_table.sgml
+++ b/doc/src/sgml/ref/alter_table.sgml
@@ -172,9 +172,13 @@ ALTER TABLE [ IF EXISTS ] <replaceable class="PARAMETER">name</replaceable>
      </para>
 
      <para>
-      If this table is a partition, one cannot perform <literal>DROP NOT NULL</>
+      If this table is a partition, one cannot perform <literal>DROP NOT NULL</literal>
       on a column if it is marked <literal>NOT NULL</literal> in the parent
-      table.
+      table.  To drop the <literal>NOT NULL</literal> constraint from all the
+      partitions, perform <literal>DROP NOT NULL</literal> on the parent
+      table.  One might however want to set it for only some partitions,
+      which is possible by doing <literal>SET NOT NULL</literal> on individual
+      partitions.
      </para>
     </listitem>
    </varlistentry>
-- 
2.11.0


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