Same - the row format itself starts with a bitmask listing all null columns. You don’t need to read the column data itself to determine if a column is null. ht

Same - the row format itself starts with a bitmask listing all null columns. You don’t need to read the column data itself to determine if a column is null. https://www.postgresql.org/docs/current/storage-page-layout.html https://www.postgresql.org/docs/current/storage-page-layout....