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docs: Only first instance of a PREPARE parameter sets data type

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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
This commit is contained in:
Bruce Momjian 2018-08-09 10:13:15 -04:00
parent 83f2691a3f
commit 8c92638c00
1 changed files with 2 additions and 2 deletions
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4
doc/src/sgml/ref/prepare.sgml
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@ -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>