CHAR datatype doesn't accept string with spaces only

Execute:

create table db_db.f_edk

(COL14_CHAR char NOT NULL,

COL17_CHAR_1 char(1) NOT NULL,

COL18_CHAR_255 char(255) NOT NULL

) engine=ColumnStore;

insert into db_db.f_edk values ('  ',' ','  ');

Result:
Error Code: 1815. Internal error: CAL0001: Insert Failed: IDB-4015: Column 'COL14_CHAR' cannot be null.

Error is displayed for every char column in the table.

Additional notes:
The string with many spaces is successfully inserted in field of varchar and text datatypes