From 8c92638c008b074df9cf3087816e3aa8c01177a5 Mon Sep 17 00:00:00 2001
From: Bruce Momjian <bruce@momjian.us>
Date: Thu, 9 Aug 2018 10:13:15 -0400
Subject: [PATCH] docs:  Only first instance of a PREPARE parameter sets data
 type

If the first reference to $1 is "($1 = col) or ($1 is null)", the data
type can be determined, but not for "($1 is null) or ($1 = col)".  This
change documents this.

Reported-by: Morgan Owens

Discussion: https://postgr.es/m/153233728858.1404.15268121695358514937@wrigleys.postgresql.org

Backpatch-through: 9.3
---
 doc/src/sgml/ref/prepare.sgml | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/doc/src/sgml/ref/prepare.sgml b/doc/src/sgml/ref/prepare.sgml
index 704fb5e4ab..3d799b5b57 100644
--- a/doc/src/sgml/ref/prepare.sgml
+++ b/doc/src/sgml/ref/prepare.sgml
@@ -52,7 +52,7 @@ PREPARE <replaceable class="parameter">name</replaceable> [ ( <replaceable class
    parameter data types can optionally be specified. When a
    parameter's data type is not specified or is declared as
    <literal>unknown</literal>, the type is inferred from the context
-   in which the parameter is used (if possible). When executing the
+   in which the parameter is first referenced (if possible). When executing the
    statement, specify the actual values for these parameters in the
    <command>EXECUTE</command> statement.  Refer to <xref
    linkend="sql-execute"/> for more
@@ -104,7 +104,7 @@ PREPARE <replaceable class="parameter">name</replaceable> [ ( <replaceable class
       The data type of a parameter to the prepared statement.  If the
       data type of a particular parameter is unspecified or is
       specified as <literal>unknown</literal>, it will be inferred
-      from the context in which the parameter is used. To refer to the
+      from the context in which the parameter is first referenced. To refer to the
       parameters in the prepared statement itself, use
       <literal>$1</literal>, <literal>$2</literal>, etc.
      </para>