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Silence another gcc 11 warning.

Per buildfarm and local experimentation, bleeding-edge gcc isn'tconvinced that the MemSet in reorder_function_arguments() is safe.Shut it up by adding an explicit check that pronargs isn't negative,and by changing MemSet to memset. (It appears that either change isenough to quiet the warning at -O2, but let's do both to be sure.)

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src/backend/optimizer/util
- clauses.c

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`‎src/backend/optimizer/util/clauses.c`

Lines changed: 2 additions & 2 deletions

Original file line number	Diff line number	Diff line change
`@@ -4104,9 +4104,9 @@ reorder_function_arguments(List *args, HeapTuple func_tuple)`
`4104`	`4104`	`inti;`
`4105`	`4105`
`4106`	`4106`	`Assert(nargsprovided <=pronargs);`
`4107`		`-if (pronargs>FUNC_MAX_ARGS)`
	`4107`	`+if (pronargs<0\|\|pronargs>FUNC_MAX_ARGS)`
`4108`	`4108`	`elog(ERROR,"too many function arguments");`
`4109`		`-MemSet(argarray,0,pronargssizeof(Node));`
	`4109`	`+memset(argarray,0,pronargssizeof(Node));`
`4110`	`4110`
`4111`	`4111`	`/* Deconstruct the argument list into an array indexed by argnumber */`
`4112`	`4112`	`i=0;`

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Commit22f71a6

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`‎src/backend/optimizer/util/clauses.c`

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