Mysql calculate row size for all tables

SELECT col_sizes.TABLE_SCHEMA, col_sizes.TABLE_NAME, SUM(col_sizes.col_size) AS EST_MAX_ROW_SIZE
FROM (
    SELECT 
        cols.TABLE_SCHEMA, 
        cols.TABLE_NAME, 
        cols.COLUMN_NAME,
        CASE cols.DATA_TYPE
            WHEN 'tinyint' THEN 1
            WHEN 'smallint' THEN 2
            WHEN 'mediumint' THEN 3
            WHEN 'int' THEN 4
            WHEN 'bigint' THEN 8
            WHEN 'float' THEN IF(cols.NUMERIC_PRECISION > 24, 8, 4)
            WHEN 'double' THEN 8
            WHEN 'decimal' THEN ((cols.NUMERIC_PRECISION - cols.NUMERIC_SCALE) DIV 9)*4  + (cols.NUMERIC_SCALE DIV 9)*4 + CEIL(MOD(cols.NUMERIC_PRECISION - cols.NUMERIC_SCALE,9)/2) + CEIL(MOD(cols.NUMERIC_SCALE,9)/2)
            WHEN 'bit' THEN (cols.NUMERIC_PRECISION + 7) DIV 8
            WHEN 'year' THEN 1
            WHEN 'date' THEN 3
            WHEN 'time' THEN 3 + CEIL(cols.DATETIME_PRECISION /2)
            WHEN 'datetime' THEN 5 + CEIL(cols.DATETIME_PRECISION /2)
            WHEN 'timestamp' THEN 4 + CEIL(cols.DATETIME_PRECISION /2)
            WHEN 'char' THEN cols.CHARACTER_OCTET_LENGTH
            WHEN 'binary' THEN cols.CHARACTER_OCTET_LENGTH
            WHEN 'varchar' THEN IF(cols.CHARACTER_OCTET_LENGTH > 255, 2, 1) + cols.CHARACTER_OCTET_LENGTH
            WHEN 'varbinary' THEN IF(cols.CHARACTER_OCTET_LENGTH > 255, 2, 1) + cols.CHARACTER_OCTET_LENGTH
            WHEN 'tinyblob' THEN 9
            WHEN 'tinytext' THEN 9
            WHEN 'blob' THEN 10
            WHEN 'text' THEN 10
            WHEN 'mediumblob' THEN 11
            WHEN 'mediumtext' THEN 11
            WHEN 'longblob' THEN 12
            WHEN 'longtext' THEN 12
            WHEN 'enum' THEN 2
            WHEN 'set' THEN 8
            ELSE 0
        END AS col_size
    FROM INFORMATION_SCHEMA.COLUMNS cols
) AS col_sizes
where TABLE_SCHEMA not in ( 'information_schema', 'sys', 'mysql','performance_schema' )
GROUP BY col_sizes.TABLE_SCHEMA, col_sizes.TABLE_NAME