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This commit allows to log the raw parse tree in the same way we currently log the parse tree, rewritten tree, and plan tree. To avoid unnecessary log noise for users not interested in this detail, a new GUC option, "debug_print_raw_parse", has been added. When starting the PostgreSQL process with "-d N", and N is 3 or higher, debug_print_raw_parse is enabled automatically, alongside debug_print_parse. Author: Chao Li <lic@highgo.com> Reviewed-by: Tender Wang <tndrwang@gmail.com> Reviewed-by: Tatsuo Ishii <ishii@postgresql.org> Reviewed-by: John Naylor <johncnaylorls@gmail.com> Discussion: https://postgr.es/m/CAEoWx2mcO0Gpo4vd8kPMAFWeJLSp0MeUUnaLdE1x0tSVd-VzUw%40mail.gmail.com