Complete the TODO in below java code: @Override

public boolean delete$($Object key$)\{$

String keyColumnName $=$ schema.getKey$()$;

if $($keyColumnName $==$ null$)$

throw new RuntimeException$("$Cannot delete when schema does not have a key."$)$;

$//$ TODO

$//$ lookup the row

$//$ if not found, return false

$//$ mark the space free in the bitmap

for $($int i $=0$; i $<$ indexes.length; i$++)\{$

if $($indexes$[$i$]!=$ null$)\{$

$//$ TODO in lab$14.$

$\}$

$\}$

throw new UnsupportedOperationException$()$;

$\}$