public void setColumnNames(String[] names) {
		Assert.notEmpty(names, "columnNames cannot be empty");
		StringBuilder columns = new StringBuilder();
		for (String column : names) {
			if (columns.length() > 0) {
				columns.append(", ");
			}
			columns.append(column).append(" varchar(2000) ");
		}
		this.columns = columns.toString();
	}
Sets the column names which will be used to create a DDL definition
of the columns for the table.
extensions/spring-xd-extension-jdbc/src/main/java/org/springframework/xd/jdbc/SingleTableDatabaseInitializer.java