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Commite5cf186

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doc: Correct description of values used in FSM for indexes
The implementation of FSM for indexes is simpler than heap, where 0 isused to track if a page is in-use and (BLCKSZ - 1) if a page is free.One comment in indexfsm.c and one description in the documentation ofpg_freespacemap were incorrect about that.Author: Alex Friedman <alexf01@gmail.com>Discussion:https://postgr.es/m/71eef655-c192-453f-ac45-2772fec2cb04@gmail.comBackpatch-through: 13
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‎doc/src/sgml/pgfreespacemap.sgml

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<para>
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For indexes, what is tracked is entirely-unused pages, rather than free
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space within pages. Therefore, the values are not meaningful, just
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whether a page isfull or empty.
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whether a page isin-use or empty.
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</para>
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<note>

‎src/backend/storage/freespace/indexfsm.c

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*This is similar to the FSM used for heap, in freespace.c, but instead
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*of tracking the amount of free space on pages, we only track whether
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*pages are completely free or in-use. We use the same FSM implementation
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*as for heaps, usingBLCKSZ - 1to denote used pages, and0 for unused.
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*as for heaps, using0to denote used pages, and(BLCKSZ - 1) for unused.
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*
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*-------------------------------------------------------------------------
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*/

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