Function ExplainProperty

src/backend/commands/explain.c:5490–5538

* Explain a simple property. * * If "numeric" is true, the value is a number (or other value that * doesn't need quoting in JSON). * * If unit is non-NULL the text format will display it after the value. * * This usually should not be invoked directly, but via one of the datatype * specific routines ExplainPropertyText, ExplainPropertyInteger, etc. */

 * specific routines ExplainPropertyText, ExplainPropertyInteger, etc.
 */
static void
ExplainProperty(const char *qlabel, const char *unit, const char *value,
				bool numeric, ExplainState *es)
{
	switch (es->format)
	{
		case EXPLAIN_FORMAT_TEXT:
			ExplainIndentText(es);
			if (unit)
				appendStringInfo(es->str, "%s: %s %s\n", qlabel, value, unit);
			else
				appendStringInfo(es->str, "%s: %s\n", qlabel, value);
			break;

		case EXPLAIN_FORMAT_XML:
			{
				char	   *str;

				appendStringInfoSpaces(es->str, es->indent * 2);
				ExplainXMLTag(qlabel, X_OPENING | X_NOWHITESPACE, es);
				str = escape_xml(value);
				appendStringInfoString(es->str, str);
				pfree(str);
				ExplainXMLTag(qlabel, X_CLOSING | X_NOWHITESPACE, es);
				appendStringInfoChar(es->str, '\n');
			}
			break;

		case EXPLAIN_FORMAT_JSON:
			ExplainJSONLineEnding(es);
			appendStringInfoSpaces(es->str, es->indent * 2);
			escape_json(es->str, qlabel);
			appendStringInfoString(es->str, ": ");
			if (numeric)
				appendStringInfoString(es->str, value);
			else
				escape_json(es->str, value);
			break;

		case EXPLAIN_FORMAT_YAML:
			ExplainYAMLLineStarting(es);
			appendStringInfo(es->str, "%s: ", qlabel);
			if (numeric)
				appendStringInfoString(es->str, value);
			else
				escape_yaml(es->str, value);
			break;
	}
}

static void
ExplainPropertyStringInfo(const char *qlabel, ExplainState *es, const char *fmt,...)