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ecdd49317a
LWT IF clause interprets equality differently from SQL (and the rest of CQL): it thinks NULL equals NULL. Currently, it implements binary operators all by itself so the fact that oper_t::EQ (and friends) means something else in the rest of the code doesn't bother it. However, we can't unify the code (in column_condition.cc) with the rest of expression evaluation if the meaning changes in different places. To prepare for this, introduce a null_handling_style field to binary_operator that defaults to `sql` but can be changed to `lwt_nulls` to indicate this special semantic. A few unit tests are added. LWT itself still isn't modified.