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0047e1e44d
Existing AST assumes the single-column expression is a special case of multi-column expressions, so it cannot distinguish `c=(0)` from `(c)=(0)`. This leads to incorrect behaviour and dtest failures. Fix it by separating the two cases explicitly in the AST representation. Modify AST-creation code to create different AST for single- and multi-column expressions. Modify AST-consuming code to handle column_name separately from vector<column_name>. Drop code relying on cardinality testing to distinguisn single-column cases. Add a new unit test for `c=(0)`. Fixes #6825. Signed-off-by: Dejan Mircevski <dejan@scylladb.com>