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Ignore table-wide NULL ratio for partial indexes where NULL is excluded #17

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Ignore table-wide NULL ratio for partial indexes where NULL is excluded #17

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8 changes: 7 additions & 1 deletion btree/btree_bloat.sql
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Original file line number Diff line number Diff line change
Expand Up @@ -52,11 +52,16 @@ FROM (
ELSE 2 + (( 32 + 8 - 1 ) / 8) -- IndexTupleData size + IndexAttributeBitMapData size ( max num filed per index + 8 - 1 /8)
END AS index_tuple_hdr_bm,
/* data len: we remove null values save space using it fractionnal part from stats */
sum( (1-coalesce(s.null_frac, 0)) * coalesce(s.avg_width, 1024)) AS nulldatawidth,
sum(
coalesce(s.avg_width, 1024)
*
(CASE WHEN nulls_indexed THEN (1 - coalesce(s.null_frac, 0)) ELSE 1 END)
) AS nulldatawidth,
max( CASE WHEN i.atttypid = 'pg_catalog.name'::regtype THEN 1 ELSE 0 END ) > 0 AS is_na
FROM (
SELECT ct.relname AS tblname, ct.relnamespace, ic.idxname, ic.attpos, ic.indkey, ic.indkey[ic.attpos], ic.reltuples, ic.relpages, ic.tbloid, ic.idxoid, ic.fillfactor,
coalesce(a1.attnum, a2.attnum) AS attnum, coalesce(a1.attname, a2.attname) AS attname, coalesce(a1.atttypid, a2.atttypid) AS atttypid,
indexdef NOT LIKE '%' || coalesce(a1.attname, a2.attname) || ' IS NOT NULL%' AS nulls_indexed,
CASE WHEN a1.attnum IS NULL
THEN ic.idxname
ELSE ct.relname
Expand Down Expand Up @@ -88,6 +93,7 @@ FROM (
ic.indkey[ic.attpos] = 0
AND a2.attrelid = ic.idxoid
AND a2.attnum = ic.attpos
LEFT JOIN pg_indexes ON indexname = idxname
) i
JOIN pg_catalog.pg_namespace n ON n.oid = i.relnamespace
JOIN pg_catalog.pg_stats s ON s.schemaname = n.nspname
Expand Down