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Wake up launcher when enabling a subscription

Otherwise one would have to wait up to DEFAULT_NAPTIME_PER_CYCLE untilthe subscription worker is considered for starting.There is a small race condition: If one enables a subscription rightafter disabling it, the launcher might not have registered the stoppingwhen receiving the wakeup signal for the re-enabling. The start willthen not happen right away but after the full cycle time.Author: Kyotaro HORIGUCHI <horiguchi.kyotaro@lab.ntt.co.jp>

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src/backend/commands
- subscriptioncmds.c

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`‎src/backend/commands/subscriptioncmds.c`

Lines changed: 3 additions & 0 deletions

Original file line number	Diff line number	Diff line change
`@@ -644,6 +644,9 @@ AlterSubscription(AlterSubscriptionStmt *stmt)`
`644`	`644`	`BoolGetDatum(enabled);`
`645`	`645`	`replaces[Anum_pg_subscription_subenabled-1]= true;`
`646`	`646`
	`647`	`+if (enabled)`
	`648`	`+ApplyLauncherWakeupAtCommit();`
	`649`	`+`
`647`	`650`	`update_tuple= true;`
`648`	`651`	`break;`
`649`	`652`	`}`

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Commita3f17b9

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`‎src/backend/commands/subscriptioncmds.c`

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