Commit997afad

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pgstat: introduce PgStat_Kind enum.

Will be used by following commits to generalize stats infrastructure. Keptseparate to allow commits stand reasonably on their own.Reviewed-By: Kyotaro Horiguchi <horikyota.ntt@gmail.com>Discussion:https://postgr.es/m/20220404041516.cctrvpadhuriawlq@alap3.anarazel.de

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Original file line number	Diff line number	Diff line change
`@@ -33,6 +33,30 @@`
`33`	`33`	`/* Default directory to store temporary statistics data in */`
`34`	`34`	`#definePG_STAT_TMP_DIR"pg_stat_tmp"`
`35`	`35`
	`36`	`+/* The types of statistics entries */`
	`37`	`+typedefenumPgStat_Kind`
	`38`	`+{`
	`39`	`+/* use 0 for INVALID, to catch zero-initialized data */`
	`40`	`+PGSTAT_KIND_INVALID=0,`
	`41`	`+`
	`42`	`+/* stats for variable-numbered objects */`
	`43`	`+PGSTAT_KIND_DATABASE,/* database-wide statistics */`
	`44`	`+PGSTAT_KIND_RELATION,/* per-table statistics */`
	`45`	`+PGSTAT_KIND_FUNCTION,/* per-function statistics */`
	`46`	`+PGSTAT_KIND_REPLSLOT,/* per-slot statistics */`
	`47`	`+PGSTAT_KIND_SUBSCRIPTION,/* per-subscription statistics */`
	`48`	`+`
	`49`	`+/* stats for fixed-numbered objects */`
	`50`	`+PGSTAT_KIND_ARCHIVER,`
	`51`	`+PGSTAT_KIND_BGWRITER,`
	`52`	`+PGSTAT_KIND_CHECKPOINTER,`
	`53`	`+PGSTAT_KIND_SLRU,`
	`54`	`+PGSTAT_KIND_WAL,`
	`55`	`+}PgStat_Kind;`
	`56`	`+`
	`57`	`+#definePGSTAT_KIND_FIRST_VALID PGSTAT_KIND_DATABASE`
	`58`	`+#definePGSTAT_KIND_LAST PGSTAT_KIND_WAL`
	`59`	`+#definePGSTAT_NUM_KINDS (PGSTAT_KIND_LAST + 1)`
`36`	`60`
`37`	`61`	`/* Values for track_functions GUC variable --- order is significant! */`
`38`	`62`	`typedefenumTrackFunctionsLevel`

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