Function ExplainJSONLineEnding

src/backend/commands/explain.c:6023–6032

* Emit a JSON line ending. * * JSON requires a comma after each property but the last. To facilitate this, * in JSON format, the text emitted for each property begins just prior to the * preceding line-break (and comma, if applicable). */

 * preceding line-break (and comma, if applicable).
 */
static void
ExplainJSONLineEnding(ExplainState *es)
{
	Assert(es->format == EXPLAIN_FORMAT_JSON);
	if (linitial_int(es->grouping_stack) != 0)
		appendStringInfoChar(es->str, ',');
	else
		linitial_int(es->grouping_stack) = 1;
	appendStringInfoChar(es->str, '\n');
}

/*
 * Indent a YAML line.