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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
`@@ -4090,9 +4090,9 @@ reorder_function_arguments(List *args, HeapTuple func_tuple)`
`4090`	`4090`	`inti;`
`4091`	`4091`
`4092`	`4092`	`Assert(nargsprovided <=pronargs);`
`4093`		`-if (pronargs>FUNC_MAX_ARGS)`
	`4093`	`+if (pronargs<0\|\|pronargs>FUNC_MAX_ARGS)`
`4094`	`4094`	`elog(ERROR,"too many function arguments");`
`4095`		`-MemSet(argarray,0,pronargssizeof(Node));`
	`4095`	`+memset(argarray,0,pronargssizeof(Node));`
`4096`	`4096`
`4097`	`4097`	`/* Deconstruct the argument list into an array indexed by argnumber */`
`4098`	`4098`	`i=0;`

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Commit4a9ce08

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

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