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323ae003e4
Break the section up with subsection headings. Add examples for depth- and breadth-first search ordering. For consistency with the SQL search clause, start the depth counting at 0 instead of 1 in the examples. Discussion: https://www.postgresql.org/message-id/c5603982-0088-7f14-0caa-fdcd0c837b57@2ndquadrant.com