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planner: Introduce a new global variable to control the historical statistics feature #30646

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merged 7 commits into from
Dec 14, 2021
Merged

planner: Introduce a new global variable to control the historical statistics feature #30646

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34a3092
planner: Introduce a new global variable to control the historical st…
An-DJ Dec 12, 2021
de5601b
planner: add unit test of tidb_enable_historical_stats
An-DJ Dec 13, 2021
b0175b5
Merge branch 'master' into historical-stats-switch
An-DJ Dec 13, 2021
cc81d16
Merge branch 'master' into historical-stats-switch
An-DJ Dec 13, 2021
7cb95ad
Merge branch 'master' into historical-stats-switch
qw4990 Dec 14, 2021
901ff27
Merge branch 'master' into historical-stats-switch
ti-chi-bot Dec 14, 2021
6aba526
Merge branch 'master' into historical-stats-switch
ti-chi-bot Dec 14, 2021
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6 changes: 5 additions & 1 deletion sessionctx/variable/sysvar.go
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Original file line number Diff line number Diff line change
Expand Up @@ -1205,7 +1205,11 @@ var defaultSysVars = []*SysVar{
{Scope: ScopeSession, Name: PluginDir, Value: "/data/deploy/plugin", GetSession: func(s *SessionVars) (string, error) {
return config.GetGlobalConfig().Plugin.Dir, nil
}},

{Scope: ScopeGlobal, Name: TiDBEnableHistoricalStats, Value: Off, Type: TypeBool, GetGlobal: func(s *SessionVars) (string, error) {
return getTiDBTableValue(s, "tidb_enable_historical_stats", Off)
}, SetGlobal: func(s *SessionVars, val string) error {
return setTiDBTableValue(s, "tidb_enable_historical_stats", val, "Current historical statistics enable status")
}},
/* tikv gc metrics */
{Scope: ScopeGlobal, Name: TiDBGCEnable, Value: On, Type: TypeBool, GetGlobal: func(s *SessionVars) (string, error) {
return getTiDBTableValue(s, "tikv_gc_enable", On)
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2 changes: 2 additions & 0 deletions sessionctx/variable/tidb_vars.go
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Expand Up @@ -620,6 +620,8 @@ const (
TiDBGCScanLockMode = "tidb_gc_scan_lock_mode"
// TiDBEnableEnhancedSecurity restricts SUPER users from certain operations.
TiDBEnableEnhancedSecurity = "tidb_enable_enhanced_security"
// TiDBEnableHistoricalStats enables the historical statistics feature (default off)
TiDBEnableHistoricalStats = "tidb_enable_historical_stats"
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Please add some tests for it. You can add them here set_test.go#L43 .

)

// TiDB intentional limits
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