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Commitb57cfb4

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Document RelationGetIndexAttrBitmap better
Commit19d8e23 changed the list of set-of-columns that can bereturned by RelationGetIndexAttrBitmap, but didn't update its"documentation". That was pretty hard to read already, so rewrite tomake it more comprehensible, adding the missing values while at it.Backpatch to 16, like that commit.Discussion:https://postgr.es/m/20230809091155.7c7f3gttjk3dj4ze@alvherre.pgsqlReviewed-by: Tomas Vondra <tomas.vondra@enterprisedb.com>
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‎src/backend/utils/cache/relcache.c

Lines changed: 9 additions & 3 deletions
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@@ -5150,9 +5150,15 @@ RelationGetIndexPredicate(Relation relation)
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* simple index keys, but attributes used in expressions and partial-index
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* predicates.)
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*
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* Depending on attrKind, a bitmap covering the attnums for all index columns,
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* for all potential foreign key columns, or for all columns in the configured
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* replica identity index is returned.
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* Depending on attrKind, a bitmap covering attnums for certain columns is
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* returned:
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*INDEX_ATTR_BITMAP_KEYColumns in non-partial unique indexes not
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*in expressions (i.e., usable for FKs)
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*INDEX_ATTR_BITMAP_PRIMARY_KEYColumns in the table's primary key
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*INDEX_ATTR_BITMAP_IDENTITY_KEYColumns in the table's replica identity
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*index (empty if FULL)
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*INDEX_ATTR_BITMAP_HOT_BLOCKINGColumns that block updates from being HOT
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*INDEX_ATTR_BITMAP_SUMMARIZEDColumns included in summarizing indexes
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*
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* Attribute numbers are offset by FirstLowInvalidHeapAttributeNumber so that
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* we can include system attributes (e.g., OID) in the bitmap representation.

‎src/include/utils/relcache.h

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@@ -54,6 +54,9 @@ extern List *RelationGetIndexPredicate(Relation relation);
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externDatum*RelationGetIndexRawAttOptions(Relationindexrel);
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externbytea**RelationGetIndexAttOptions(Relationrelation,boolcopy);
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/*
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* Which set of columns to return by RelationGetIndexAttrBitmap.
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*/
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typedefenumIndexAttrBitmapKind
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{
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INDEX_ATTR_BITMAP_KEY,

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