After casting INT to CHAR, there may be a lot of trailing junk chars

[localhost.localdomain:21000] > select cast(999 as char(128));
Query: select cast(999 as char(128))
Prettytable cannot resolve string columns values that have  embedded tabs. Reverting to tab delimited text output
999&K
'K
LM
LN	OP	OQ
LR	#S
#T
UV	#W
#X	#Y
#Z	#[
#\
L]
L^
#_
#`
La
#b
#c
Ld
Le

Fetched 1 row(s) in 0.02s


[localhost.localdomain:21000] > select length(cast(999 as char(128)));
Query: select length(cast(999 as char(128)))
+--------------------------------+
| length(cast(999 as char(128))) |
+--------------------------------+
| 128                            |
+--------------------------------+
Fetched 1 row(s) in 0.02s