Function fmtCopyColumnList

src/bin/pg_dump/pg_dump.c:21372–21401

* Return a column list clause for the given relation. * * Special case: if there are no undropped columns in the relation, return * "", not an invalid "()" column list. */

 * "", not an invalid "()" column list.
 */
static const char *
fmtCopyColumnList(const TableInfo *ti, PQExpBuffer buffer)
{
	int			numatts = ti->numatts;
	char	  **attnames = ti->attnames;
	bool	   *attisdropped = ti->attisdropped;
	char	   *attgenerated = ti->attgenerated;
	bool		needComma;
	int			i;

	appendPQExpBufferChar(buffer, '(');
	needComma = false;
	for (i = 0; i < numatts; i++)
	{
		if (attisdropped[i])
			continue;
		if (attgenerated[i])
			continue;
		if (needComma)
			appendPQExpBufferStr(buffer, ", ");
		appendPQExpBufferStr(buffer, fmtId(attnames[i]));
		needComma = true;
	}

	if (!needComma)
		return "";				/* no undropped columns */

	appendPQExpBufferChar(buffer, ')');
	return buffer->data;
}

/*
 * Check if a reloptions array is nonempty.