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Add spaces to manual page.

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This commit is contained in:
Bruce Momjian 2000-10-10 04:42:43 +00:00
parent f03f24663b
commit 1fe2b77d01
1 changed files with 9 additions and 9 deletions
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18
doc/src/sgml/ref/create_operator.sgml
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@ -1,5 +1,5 @@
<!--
$Header: /cvsroot/pgsql/doc/src/sgml/ref/create_operator.sgml,v 1.16 2000/09/12 20:52:08 momjian Exp $
$Header: /cvsroot/pgsql/doc/src/sgml/ref/create_operator.sgml,v 1.17 2000/10/10 04:42:43 momjian Exp $
Postgres documentation
-->
@ -248,13 +248,13 @@ CREATE
Hence, the query optimizer could freely convert:
<programlisting>
box '((0,0),(1,1))' &gt;&gt;&gt; MYBOXES.description
box '((0,0), (1,1))' &gt;&gt;&gt; MYBOXES.description
</programlisting>
to
<programlisting>
MYBOXES.description &lt;&lt;&lt; box '((0,0),(1,1))'
MYBOXES.description &lt;&lt;&lt; box '((0,0), (1,1))'
</programlisting>
</para>
<para>
@ -269,11 +269,11 @@ MYBOXES.description &lt;&lt;&lt; box '((0,0),(1,1))'
equal, !==.
The negator link allows the query optimizer to simplify
<programlisting>
NOT MYBOXES.description === box '((0,0),(1,1))'
NOT MYBOXES.description === box '((0,0), (1,1))'
</programlisting>
to
<programlisting>
MYBOXES.description !== box '((0,0),(1,1))'
MYBOXES.description !== box '((0,0), (1,1))'
</programlisting>
</para>
<para>
@ -331,7 +331,7 @@ MYBOXES.description !== box '((0,0),(1,1))'
The RESTRICT and JOIN options assist the query optimizer in estimating
result sizes. If a clause of the form:
<programlisting>
MYBOXES.description &lt;&lt;&lt; box '((0,0),(1,1))'
MYBOXES.description &lt;&lt;&lt; box '((0,0), (1,1))'
</programlisting>
is present in the qualification,
then <productname>Postgres</productname> may have to
@ -342,7 +342,7 @@ MYBOXES.description &lt;&lt;&lt; box '((0,0),(1,1))'
<command>CREATE FUNCTION</command>) which accepts arguments of the correct
data types and returns a floating point number. The
query optimizer simply calls this function, passing the
parameter <literal>((0,0),(1,1))</literal> and multiplies the result by the relation
parameter <literal>((0,0), (1,1))</literal> and multiplies the result by the relation
size to get the expected number of instances.
</para>
<para>
@ -356,11 +356,11 @@ MYBOXES.description &lt;&lt;&lt; box '((0,0),(1,1))'
<para>
The difference between the function
<programlisting>
my_procedure_1 (MYBOXES.description, box '((0,0),(1,1))')
my_procedure_1 (MYBOXES.description, box '((0,0), (1,1))')
</programlisting>
and the operator
<programlisting>
MYBOXES.description === box '((0,0),(1,1))'
MYBOXES.description === box '((0,0), (1,1))'
</programlisting>
is that <productname>Postgres</productname>
attempts to optimize operators and can