selective statement logging

The TODO list contains this item which I said I would look at:

Allow logging of only data definition(DDL), or DDL and modification
statements

The trouble I see is that we currently do statement logging before we
have examined the query string at all, in the code shown below from
src/backend/tcop/postgres.c.

I guess I could construct one or more regexes to examine the query
string, although that might affect performance a bit (of course, I would
precompile the patterns).

Any other ideas on how to proceed?

cheers

andrew

List *
pg_parse_query(const char *query_string)
{
List *raw_parsetree_list;

if (log_statement)
ereport(LOG,
(errmsg("statement: %s", query_string)));

if (log_parser_stats)
ResetUsage();

raw_parsetree_list = raw_parser(query_string);

if (log_parser_stats)
ShowUsage("PARSER STATISTICS");

return raw_parsetree_list;
}