columnalign="left"
$\begin{array}{ccc}\text{123}\hfill & \text{123}\hfill & \text{123}\hfill \\ \text{12345}\hfill & \text{12345}\hfill & \text{12345}\hfill \\ \text{1234567}\hfill & \text{1234567}\hfill & \text{1234567}\hfill \end{array}$
columnalign="center"
$\begin{array}{ccc}\hfill \text{123}\hfill & \hfill \text{123}\hfill & \hfill \text{123}\hfill \\ \hfill \text{12345}\hfill & \hfill \text{12345}\hfill & \hfill \text{12345}\hfill \\ \hfill \text{1234567}\hfill & \hfill \text{1234567}\hfill & \text{1234567}\end{array}$
columnalign="right"
$\begin{array}{ccc}\hfill \text{123}& \hfill \text{123}& \hfill \text{123}\\ \hfill \text{12345}& \hfill \text{12345}& \hfill \text{12345}\\ \hfill \text{1234567}& \hfill \text{1234567}& \text{1234567}\end{array}$