doc: add float as an alias for double precision.

Although the "Floating-Point Types" section says that "float" data
type is taken to mean "double precision", this information was not
reflected in the data type table that lists all data type aliases.

Reported-by: alexander.kjall@hafslund.no
Author: Euler Taveira <euler@eulerto.com>
Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us>
Discussion: https://postgr.es/m/175456294638.800.12038559679827947313@wrigleys.postgresql.org
Backpatch-through: 13

diff --git a/doc/src/sgml/datatype.sgml b/doc/src/sgml/datatype.sgml
index d621437c414ec914691b56fbae4cc8ccffc82d5e..7cb65652579a46b32a0ad2487cc0eded6d6b296d 100644 (file)
--- a/doc/src/sgml/datatype.sgml
+++ b/doc/src/sgml/datatype.sgml
@@ -117,7 +117,7 @@
 
       <row>
        <entry><type>double precision</type></entry>
-       <entry><type>float8</type></entry>
+       <entry><type>float</type>, <type>float8</type></entry>
        <entry>double precision floating-point number (8 bytes)</entry>
       </row>