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the operator<< for `cql3::expr::test_utils::mutation_column_value` is preserved, as it used by test/lib/expr_test_utils.cc, which prints std::map<sstring, cql3::expr::test_utils::mutation_column_value> using the homebrew generic formatter for std::map<>. and the formatter uses operator<< for printing the elements in map. Refs #13245 Signed-off-by: Kefu Chai <kefu.chai@scylladb.com>