Does Teradata Support BIT Columns? Yes and No.

In Teradata 13.0, I can create a column with a type of bit.

CREATE MULTISET TABLE test1,
    NO FALLBACK,
    NO BEFORE JOURNAL,
    NO AFTER JOURNAL 
(
    id         INT  NOT NULL,
    bitColumn  bit
);

But did it really create a bit column? No.

Query

SELECT RequestText
FROM DBC.Tables
WHERE DatabaseName = 'rgarrison'
  AND TableName    = 'test1';

Result

CREATE MULTISET TABLE test1,
    NO FALLBACK,
    NO BEFORE JOURNAL,
    NO AFTER JOURNAL
(
    id INT NOT NULL,
    bitColumn BYTEINT FORMAT '9'
);

Query

SELECT ColumnType, ColumnLength
FROM DBC.Columns
WHERE DatabaseName = 'rgarrison'
  AND TableName    = 'test1'
  AND ColumnName   = 'bitColumn';

Result

ColumnType	ColumnLength
I1	1

So, Teradata will allow you to specify bit as a datatype, but it will silently translate that request to byteint.