"Tom Lane" <[EMAIL PROTECTED]> writes
> Please exhibit a case in which you feel this is needed.

Suppose I want to print a debug info in parseTypeString() like this:

    + elog(DEBUG1, "parse type %s", buf.data);
     raw_parsetree_list = raw_parser(buf.data);

Rebuild the server, psql it:

    test=# set log_min_messages = debug1;
    test=# select regtypein('int4');
    DEBUG:  parse type SELECT NULL::int4
    CONTEXT:  invalid type name "int4"
    (1 row)

The CONTEXT info is bogus.

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TIP 9: In versions below 8.0, the planner will ignore your desire to
       choose an index scan if your joining column's datatypes do not

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