How do I get a histogram of values from within a table?

When I create an array from a select few values from a categorical variable in a table, the histogram shows every variable from the table instead of just the ones in the array.

table1 = table(table.column1 == "CAT", :);
array = table1.column1;
histogram(array)

The code above shows a histogram of the entire column table.column1 instead of a histogram of the array created by using table1.