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duplicate indexes

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Original file line number	Diff line number	Diff line change
`@@ -311,3 +311,17 @@ $$;`
`311`	`311`	`# gender_by_name`
`312`	`312`
`313`	`313`	`http://ceur-ws.org/Vol-2754/paper3.pdf`
	`314`	`+`
	`315`	`+# duplicate indexes`
	`316`	`+`
	`317`	+```sql
	`318`	`+SELECT pg_size_pretty(sum(pg_relation_size(idx))::bigint) AS size,`
	`319`	`+ (array_agg(idx))[1] AS idx1, (array_agg(idx))[2] AS idx2,`
	`320`	`+ (array_agg(idx))[3] AS idx3, (array_agg(idx))[4] AS idx4`
	`321`	`+FROM (`
	`322`	`+ SELECT indexrelid::regclass AS idx, (indrelid::text \|\|E'\n'\|\| indclass::text \|\|E'\n'\|\| indkey::text \|\|E'\n'\|\|`
	`323`	`+ coalesce(indexprs::text,'')\|\|E'\n' \|\| coalesce(indpred::text,'')) AS KEY`
	`324`	`+ FROM pg_index) sub`
	`325`	`+GROUP BY KEY HAVING count(*)>1`
	`326`	`+ORDER BY sum(pg_relation_size(idx)) DESC;`
	`327`	+```

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