Function errtablecol

src/backend/utils/cache/relcache.c:6022–6035

* errtablecol --- stores schema_name, table_name and column_name * of a table column within the current errordata. * * The column is specified by attribute number --- for most callers, this is * easier and less error-prone than getting the column name for themselves. */

 * easier and less error-prone than getting the column name for themselves.
 */
int
errtablecol(Relation rel, int attnum)
{
	TupleDesc	reldesc = RelationGetDescr(rel);
	const char *colname;

	/* Use reldesc if it's a user attribute, else consult the catalogs */
	if (attnum > 0 && attnum <= reldesc->natts)
		colname = NameStr(TupleDescAttr(reldesc, attnum - 1)->attname);
	else
		colname = get_attname(RelationGetRelid(rel), attnum, false);

	return errtablecolname(rel, colname);
}

/*
 * errtablecolname --- stores schema_name, table_name and column_name