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Increase MAX_SYSCACHE_CALLBACKS from 20 to 32.

By my count there are 18 callers of CacheRegisterSyscacheCallback in thecore code in HEAD, so we are potentially leaving as few as 2 slots for anyadd-on code to use (though possibly not all these callers would actuallyactivate in any particular session). That doesn't seem like a lot ofheadroom, so let's pump it up a little.

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src/backend/utils/cache
- inval.c

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`‎src/backend/utils/cache/inval.c`

Lines changed: 1 addition & 1 deletion

Original file line number	Diff line number	Diff line change
`@@ -174,7 +174,7 @@ static intmaxSharedInvalidMessagesArray;`
`174`	`174`	`* assumes there won't be very many of these at once; could improve if needed.`
`175`	`175`	`*/`
`176`	`176`
`177`		`-#defineMAX_SYSCACHE_CALLBACKS20`
	`177`	`+#defineMAX_SYSCACHE_CALLBACKS32`
`178`	`178`	`#defineMAX_RELCACHE_CALLBACKS 5`
`179`	`179`
`180`	`180`	`staticstructSYSCACHECALLBACK`

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Commit0ce4459

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`‎src/backend/utils/cache/inval.c`

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