Обсуждение: pgsql: Add some code to EXPLAIN to show the targetlist (ie, output

Log Message:
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Add some code to EXPLAIN to show the targetlist (ie, output columns)
of each plan node.  For the moment this is debug support only and is
not enabled unless EXPLAIN_PRINT_TLISTS is defined at build time.
Later I'll see about the idea of letting EXPLAIN VERBOSE do it.

Modified Files:
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    pgsql/src/backend/commands:
        explain.c (r1.171 -> r1.172)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/commands/explain.c?r1=1.171&r2=1.172)