Avi Kivity
ecdd49317a
cql3: expr: add LWT IF clause variants of binary operators
...
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.
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