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Return NULL from json_object_agg if it gets no rows.

This makes it consistent with the docs and with all other builtinaggregates apart from count().

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Lines changed: 1 addition & 1 deletion

Original file line number	Diff line number	Diff line change
`@@ -1948,7 +1948,7 @@ json_object_agg_finalfn(PG_FUNCTION_ARGS)`
`1948`	`1948`	`state=PG_ARGISNULL(0) ?NULL : (StringInfo)PG_GETARG_POINTER(0);`
`1949`	`1949`
`1950`	`1950`	`if (state==NULL)`
`1951`		`-PG_RETURN_TEXT_P(cstring_to_text("{}"));`
	`1951`	`+PG_RETURN_NULL();`
`1952`	`1952`
`1953`	`1953`	`appendStringInfoString(state," }");`
`1954`	`1954`

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