Hi Hackers,
In a lot places, there are logic of appending comma separators in a pattern like:
```
for (int i = 0; i < len; i
++){
if (i > 0)
appendStringInfoString(", ");
appendStringInfo(some-item);
```
This pattern uses an "if" check and two appendStringInfoString() to build a comma-delimited string.
This can be simplified as:
```
const char *sep = "";
for (int i = 0; i < len; i
++){
appendStringInfo("%s%s", sep, some-item);
sep = ", ";
}
```
The new pattern avoids the "if" check, and combines two appendStringInfoString() into a single appendStringInfo(). I think the new pattern is neater and faster.
The old patterns are used in a lot of places, and there are some usages of the new pattern as well. Instead of creating a big cleanup patch, I just applied the new pattern to a single file for now to see if the hacker group likes this change.
