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Allow NumericOnly to be "+ FCONST".

The NumericOnly grammar production accepted ICONST, + ICONST, - ICONST,FCONST, and - FCONST, but for some reason not + FCONST. This led tostrange inconsistencies likeregression=# set random_page_cost = +4;SETregression=# set random_page_cost = 4000000000;SETregression=# set random_page_cost = +4000000000;ERROR: syntax error at or near "4000000000"(because 4000000000 is too large to be an ICONST). While there'sno actual functional reason to need to write a "+", if we allowit for integers it seems like we should allow it for numerics too.It's been like that forever, so back-patch to all supported branches.Discussion:https://postgr.es/m/30908.1496006184@sss.pgh.pa.us

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src/backend/parser
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Original file line number	Diff line number	Diff line change
`@@ -4121,6 +4121,7 @@ opt_by:BY{}`
`4121`	`4121`
`4122`	`4122`	`NumericOnly:`
`4123`	`4123`	`FCONST{$$ = makeFloat($1); }`
	`4124`	`+\|'+'FCONST{$$ = makeFloat($2); }`
`4124`	`4125`	`\|'-'FCONST`
`4125`	`4126`	`{`
`4126`	`4127`	`$$ = makeFloat($2);`

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Commitce50945

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`‎src/backend/parser/gram.y`

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