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`prepare_expression` takes an unprepared CQL expression straight from the parser output and prepares it. Preparation consists of various type checks that are needed to ensure that the expression is correct and to reason about it. While `prepare_expression` supports a number of different types of expressions, until now it was impossible to prepare a `binary_operator`. Eventually we would like to be able to prepare all kinds of expressions, so this PR adds the missing support for `binary_operator`. Closes #12550 * github.com:scylladb/scylladb: expr_test: test preparing binary_operator with NULL RHS expr_test: test preparing IS NOT NULL binary_operator expr_test: test preparing binary_operator with LIKE expr_test: test preparing binary_operator with CONTAINS KEY expr_test: test preparing binary_operator with CONTAINS expr_test: test preparing binary_operator with IN expr_test: test preparing binary_operator with =, !=, <, <=, >, >= expr_test: use make_*_untyped function in existing tests expr_test_utils: add utilities to create untyped_constant expr_test_utils: add make_float_* and make_double_* cql3: expr: make it possible to prepare binary_operator using prepare_expression cql3/expr: check that RHS of IS NOT NULL is a null value when preparing binary operators cql3: expr: pass non-empty keyspace name in prepare_binary_operator cql3: expr: take reference to schema in prepare_binary_operator