case fails on array joins with different tiling

[Dimitar Misev]

These queries in the systemtest:

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induction_all_operations_int_divide.rasql
select (case when test_grey2 = 0 then 0c else div(test_grey, test_grey2) end) from test_grey, test_grey2
----------------------------------------------------------------------
induction_all_operations_modulo.rasql
select (case when test_grey2 = 0 then 0c else mod(test_grey, test_grey2) end) from test_grey, test_grey2

.. fail when test_grey and test_grey2 (mr collections basically) are inserted with different tiling schemes:

rasql --user rasadmin --passwd rasadmin -q 'create collection test_grey GreySet'
rasql --user rasadmin --passwd rasadmin -q 'create collection test_grey2 GreySet'
rasql --user rasadmin --passwd rasadmin -q 'insert into test_grey values decode($1 ) tiling aligned [0:49,0:29] tile size 1500' -f $RMANSRC/src/systemtest/testcases_mandatory/test_select/testdata/mr_1.png

rasql --user rasadmin --passwd rasadmin -q 'insert into test_grey2 values decode($1 ) tiling aligned [0:29,0:59] tile size 1800' -f $RMANSRC/src/systemtest/testcases_mandatory/test_select/testdata/mr_1.png