Github user dyozie commented on a diff in the pull request:
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+title: Using HAWQ Built-In Languages
+This section provides an introduction to using the HAWQ built-in languages.
+HAWQ supports user-defined functions created with the SQL and C built-in
languages. HAWQ also supports user-defined aliases for internal functions.
+## <a id="enablebuiltin"></a>Enabling Built-in Language Support
+Support for SQL, internal, and C language user-defined functions is
enabled by default for all HAWQ databases.
+## <a id="builtinsql"></a>SQL
+SQL functions execute an arbitrary list of SQL statements. The SQL
statements in the body of an SQL function must be separated by semicolons. The
final statement in a non-void-returning SQL function must be a
[SELECT](../reference/sql/SELECT.html) that returns data of the type specified
by the function's return type. The function will return a single or set of rows
corresponding to this last SQL query.
+The following example creates and calls an SQL function to count the
number of rows of the database named `orders`:
+gpadmin=# CREATE FUNCTION count_orders() RETURNS bigint AS $$
+ SELECT count(*) FROM orders;
+$$ LANGUAGE SQL;
+gpadmin=# select count_orders();
+For additional information on creating SQL functions, refer to [Query
Functions](https://www.postgresql.org/docs/8.2/static/xfunc-sql.html) in the
--- End diff --
Global edit: Change "For additional information on" to "For additional
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