GP - report the segment host configuration

SQL to list out segment host configuration

SELECT hostname AS \"Host\",
sum(CASE WHEN role='p' AND content >= 0 THEN 1 ELSE 0 END) AS \"# of Primary Segs\",
sum(CASE WHEN role='m' AND content >= 0 THEN 1 ELSE 0 END) AS \"# of Mirror Segs\",
sum(CASE WHEN role=preferred_role THEN 1 ELSE 0 END) AS \"# in Preferred Role\"
FROM gp_segment_configuration
GROUP BY rollup(1);

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