postgresql - Can't use an IF ... THEN ... ELSE inside my CASE statment SQL state: 42601 -

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i building insert query on fly. here collecting column names. columns need scrambled, , need decrypted, scrambled , encrypted.

my idea check if column name in provided array, , if is, check see if value start 'pi2'. if so, apply necessary transformation decrypt, translate, encrypt. else translate value. here query: 

select case    when column_name = any(array['a', 'pi2_b', 'pi2_c', 'd', 'e'])       (        if (substring(column_name 0 4) = 'pi2')           'my_function.my_encrypt(translate(my_function.my_decrypt('||column_name ||'), '''|| var_scramble_key1 ||''','''|| var_scramble_key2 ||'''))';      else 'translate('||column_name||','''|| var_scramble_key1 ||''','''|| var_scramble_key2 ||''')';      end if; )     else column_name end information_schema.columns table_schema = 'my_temp' , table_name = 'table_a' order ordinal_position asc

running query gives me syntax error:

at or near 'then' sql state: 42601 character: 177.

my question why can't use if else inside case statement.

i have workaround:

select case    when column_name = any(array['a', 'pi2_b', 'pi2_c', 'd', 'e']) , substring(column_name 0 4) = 'pi2'           'my_function.my_encrypt(translate(my_function.my_decrypt('||column_name ||'), '''|| var_scramble_key1 ||''','''|| var_scramble_key2 ||'''))';      when column_name = any(array['a', 'pi2_b', 'pi2_c', 'd', 'e'])   'translate('||column_name||','''|| var_scramble_key1 ||''','''|| var_scramble_key2 ||''')';    else column_name end information_schema.columns table_schema = 'my_temp' , table_name = 'table_a' order ordinal_position asc

because if not sql key word.
key word if valid in pl/pgsql not within sql statement.
case happens valid in both (but there subtle syntax differences!)


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