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table_a.column_x == 0000 ? 'UNK' : String.valueOf(table_a.column_x)
table_a.column_x.equals("0000") ? "UNK" : table_a.column_x
table_a.column_x.equals("0000") ? "UNK" : table_a.column_x
However, kzone's answer looks reasonable, though I didn't try it