<function>plpy.fatal</function> actually raise a Python exception

which, if uncaught, propagates out to the calling query, causing

the current transaction or subtransaction to be aborted.

<literal>raise plpy.ERROR(<replaceable>msg</>)</literal> and

<literal>raise plpy.FATAL(<replaceable>msg</>)</literal> are

<literal>raise plpy.Error(<replaceable>msg</>)</literal> and

<literal>raise plpy.Fatal(<replaceable>msg</>)</literal> are

equivalent to calling

<function>plpy.error</function> and

<function>plpy.fatal</function>, respectively.