Description:
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Whenever I use pg_copy_from() I get an error in /var/log/postgresql/postgresql-8.3-main.log :


2009-03-12 19:43:12 CET WARNING:  nonstandard use of \\ in a string literal at character 82
2009-03-12 19:43:12 CET HINT:  Use the escape string syntax for backslashes, e.g., E'\\'.

This is caused by pg_copy_from(), which in pgsql.c does something like the following:

    spprintf(&query, 0, "COPY \"%s\" FROM STDIN DELIMITERS '%c' WITH NULL AS '%s'", table_name, *pg_delim, "\\\\N");

If I pass the optional custom NULL indicator arg to pg_copy_from, ie replace "\\\\N" with for example "NULL", then the error goes away.

Reproduce code:
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  pg_query($db->connection, "CREATE TABLE test(a INT)");
  pg_copy_from($db->connection, "test", Array(1));