test/cluster: add cluster test for prepared metadata_id promotion

Add a regression test that verifies the server correctly promotes the
prepared metadata_id for statements whose PREPARE response carries empty
result metadata (NO_METADATA), such as LIST ROLES OF.
The standard Python driver does not negotiate SCYLLA_USE_METADATA_ID and
cannot exercise this path, so the test uses a minimal raw CQL v5 socket
implementation that negotiates the extension directly in the STARTUP
options and includes result_metadata_id in EXECUTE frames.

Two test cases are added:
- test_list_roles_of_prepared_metadata_promotion: happy path — verifies
  that an EXECUTE carrying a stale empty metadata_id receives a
  METADATA_CHANGED response with the real metadata_id.
- test_list_roles_of_prepared_metadata_promotion_suppressed_by_injection:
  negative path — activates the skip_rows_metadata_changed_response
  error injection point and verifies that the promotion is suppressed,
  confirming the happy-path test is not a false positive.

To support the injection-based negative test, two error injection points
are added to transport/server.cc:
- skip_prepared_result_metadata_promotion: bypasses the promotion logic
  in process_execute_internal so the cached prepared entry is not updated.
- skip_rows_metadata_changed_response: suppresses the METADATA_CHANGED
  flag and NO_METADATA clearance in response::write so the client sees
  the stale NO_METADATA response as if the fix were absent.

Tests: test/cluster/auth_cluster/test_prepared_metadata_promotion.py (dev/dbg)

cql3/prepared_statements_cache.hh

@@ -143,6 +143,15 @@ public:
         return value_type();
     }
 
+    bool update_result_metadata_id(const key_type& key, cql3::cql_metadata_id_type metadata_id) {
+        cache_value_ptr vp = _cache.find(key.key());
+        if (!vp) {
+            return false;
+        }
+        (*vp)->update_result_metadata_id(std::move(metadata_id));
+        return true;
+    }
+
     template <typename Pred>
     requires std::is_invocable_r_v<bool, Pred, ::shared_ptr<cql_statement>>
     void remove_if(Pred&& pred) {

cql3/query_processor.hh

@@ -260,6 +260,10 @@ public:
         return _prepared_cache.find(key);
     }
 
+    bool update_prepared_result_metadata_id(const prepared_cache_key_type& key, cql_metadata_id_type metadata_id) {
+        return _prepared_cache.update_result_metadata_id(key, std::move(metadata_id));
+    }
+
     inline
     future<::shared_ptr<cql_transport::messages::result_message>>
     execute_prepared(

cql3/statements/prepared_statement.hh

@@ -52,6 +52,7 @@ public:
     std::vector<sstring> warnings;
 private:
     cql_metadata_id_type _metadata_id;
+    bool _result_metadata_is_empty;
 
 public:
     prepared_statement(audit::audit_info_ptr&& audit_info, seastar::shared_ptr<cql_statement> statement_, std::vector<seastar::lw_shared_ptr<column_specification>> bound_names_,
@@ -71,6 +72,15 @@ public:
     void calculate_metadata_id();
 
     cql_metadata_id_type get_metadata_id() const;
+
+    bool result_metadata_is_empty() const {
+        return _result_metadata_is_empty;
+    }
+
+    void update_result_metadata_id(cql_metadata_id_type metadata_id) {
+        _metadata_id = std::move(metadata_id);
+        _result_metadata_is_empty = false;
+    }
 };
 
 }

cql3/statements/raw/parsed_statement.cc

@@ -49,6 +49,7 @@ prepared_statement::prepared_statement(
     , partition_key_bind_indices(std::move(partition_key_bind_indices))
     , warnings(std::move(warnings))
     , _metadata_id(bytes{})
+    , _result_metadata_is_empty(statement->get_result_metadata()->flags().contains<metadata::flag::NO_METADATA>())
 {
     statement->set_audit_info(std::move(audit_info));
 }

test/boost/schema_change_test.cc

@@ -29,6 +29,7 @@
 #include "test/lib/exception_utils.hh"
 #include "test/lib/log.hh"
 #include "test/lib/test_utils.hh"
+#include "transport/response.hh"
 
 BOOST_AUTO_TEST_SUITE(schema_change_test)
 
@@ -701,6 +702,16 @@ cql3::cql_metadata_id_type compute_metadata_id(std::vector<std::pair<sstring, sh
     return cql3::metadata{columns_specification}.calculate_metadata_id();
 }
 
+std::vector<lw_shared_ptr<cql3::column_specification>> make_columns_specification(
+        const std::vector<std::pair<sstring, shared_ptr<const abstract_type>>>& columns, sstring ks = "ks", sstring cf = "cf") {
+    std::vector<lw_shared_ptr<cql3::column_specification>> columns_specification;
+    columns_specification.reserve(columns.size());
+    for (const auto& column : columns) {
+        columns_specification.push_back(make_lw_shared(cql3::column_specification(ks, cf, make_shared<cql3::column_identifier>(column.first, false), column.second)));
+    }
+    return columns_specification;
+}
+
 BOOST_AUTO_TEST_CASE(metadata_id_with_different_keyspace_and_table) {
     const auto c = std::make_pair("id", uuid_type);
     auto h1 = compute_metadata_id({c}, "ks1", "cf1");
@@ -751,6 +762,39 @@ BOOST_AUTO_TEST_CASE(metadata_id_with_different_column_order) {
     verify_metadata_id_is_stable(h2, "b52512f2b76d3e0695dcaf7b0a71efac");
 }
 
+BOOST_AUTO_TEST_CASE(metadata_id_changed_rows_response_overrides_no_metadata) {
+    auto empty_metadata_id = cql3::metadata{std::vector<lw_shared_ptr<cql3::column_specification>>{}}.calculate_metadata_id();
+    auto stale_response_metadata_id = empty_metadata_id;
+    auto columns_specification = make_columns_specification({{"role", utf8_type}});
+    cql3::metadata rows_metadata(columns_specification);
+    auto rows_metadata_id = rows_metadata.calculate_metadata_id();
+
+    cql_transport::response resp{0, cql_transport::cql_binary_opcode::RESULT, tracing::trace_state_ptr{}};
+    resp.write(rows_metadata, cql_transport::cql_metadata_id_wrapper(
+            std::move(empty_metadata_id),
+            std::move(stale_response_metadata_id)), true);
+
+    auto body_stream = std::move(resp).extract_body();
+    auto body = body_stream.linearize();
+    const auto* ptr = reinterpret_cast<const char*>(body.begin());
+
+    const auto flags_mask = read_be<int32_t>(ptr);
+    ptr += sizeof(int32_t);
+    const auto flags = cql3::metadata::flag_enum_set::from_mask(flags_mask);
+    BOOST_REQUIRE(flags.contains<cql3::metadata::flag::METADATA_CHANGED>());
+    BOOST_REQUIRE(!flags.contains<cql3::metadata::flag::NO_METADATA>());
+
+    const auto column_count = read_be<int32_t>(ptr);
+    ptr += sizeof(int32_t);
+    BOOST_REQUIRE_EQUAL(column_count, 1);
+
+    const auto metadata_id_length = read_be<uint16_t>(ptr);
+    ptr += sizeof(uint16_t);
+    BOOST_REQUIRE_EQUAL(metadata_id_length, rows_metadata_id._metadata_id.size());
+    BOOST_REQUIRE(std::equal(rows_metadata_id._metadata_id.begin(), rows_metadata_id._metadata_id.end(),
+            reinterpret_cast<const bytes::value_type*>(ptr)));
+}
+
 BOOST_AUTO_TEST_CASE(metadata_id_with_udt) {
 
     auto compute_metadata_id_for_type = [&](

test/cluster/auth_cluster/test_prepared_metadata_promotion.py

@@ -0,0 +1,328 @@
+#
+# Copyright (C) 2026-present ScyllaDB
+#
+# SPDX-License-Identifier: LicenseRef-ScyllaDB-Source-Available-1.0
+#
+
+import asyncio
+import dataclasses
+import hashlib
+import socket
+import struct
+
+import pytest
+from test.pylib.manager_client import ManagerClient
+from test.pylib.rest_client import inject_error
+from test.pylib.util import unique_name
+from test.cluster.auth_cluster import extra_scylla_config_options as auth_config
+
+
+# ---------------------------------------------------------------------------
+# Minimal raw CQL v4 socket helpers with SCYLLA_USE_METADATA_ID extension.
+#
+# The standard Python driver never negotiates SCYLLA_USE_METADATA_ID and
+# therefore never includes result_metadata_id in EXECUTE requests for
+# protocol v4.  In CQL v5 result_metadata_id exchange is mandatory and
+# built into the wire format; until Scylla implements v5, this extension
+# provides the same semantics on v4.  The helpers below implement just
+# enough of the CQL wire protocol to exercise the server-side prepared
+# metadata promotion path introduced for v5 compatibility.
+# ---------------------------------------------------------------------------
+
+# CQL opcodes
+_OP_STARTUP = 0x01
+_OP_AUTH_RESPONSE = 0x0F
+_OP_PREPARE = 0x09
+_OP_EXECUTE = 0x0A
+_OP_READY = 0x02
+_OP_AUTHENTICATE = 0x03
+_OP_RESULT = 0x08
+_OP_AUTH_SUCCESS = 0x10
+
+# RESULT kind codes
+_RESULT_KIND_ROWS = 0x00000002
+_RESULT_KIND_PREPARED = 0x00000004
+
+# Rows metadata flags (bit positions in the uint32 flags field)
+_META_NO_METADATA = 1 << 2
+_META_METADATA_CHANGED = 1 << 3
+
+# EXECUTE options flags (1-byte field in CQL v4)
+_FLAG_SKIP_METADATA = 0x02
+
+_FRAME_HEADER_SIZE = 9  # version(1)+flags(1)+stream(2)+opcode(1)+length(4)
+_CQL_VERSION = "3.0.0"
+_DEFAULT_CONSISTENCY = 0x0006  # LOCAL_QUORUM
+
+
+def _pack_short(v: int) -> bytes:
+    return struct.pack(">H", v)
+
+
+def _pack_int(v: int) -> bytes:
+    return struct.pack(">I", v)
+
+
+def _short_bytes(b: bytes) -> bytes:
+    """CQL [short bytes]: uint16 length prefix + payload."""
+    return _pack_short(len(b)) + b
+
+
+def _long_string(s: str) -> bytes:
+    """CQL [long string]: uint32 length prefix + UTF-8 bytes."""
+    b = s.encode()
+    return _pack_int(len(b)) + b
+
+
+def _string_map(d: dict[str, str]) -> bytes:
+    """CQL [string map]: uint16 count + (uint16-prefixed-string, uint16-prefixed-string)*."""
+    out = _pack_short(len(d))
+    for k, v in d.items():
+        out += _short_bytes(k.encode())
+        out += _short_bytes(v.encode())
+    return out
+
+
+def _frame(opcode: int, body: bytes, stream: int) -> bytes:
+    """Build a CQL v4 request frame."""
+    return struct.pack(">BBHBI", 0x04, 0x00, stream, opcode, len(body)) + body
+
+
+def _recv_frame(sock: socket.socket) -> tuple[int, int, bytes]:
+    """Read one CQL v4 response frame; return (stream, opcode, body)."""
+    header = b""
+    while len(header) < _FRAME_HEADER_SIZE:
+        chunk = sock.recv(_FRAME_HEADER_SIZE - len(header))
+        assert chunk, "Connection closed while reading frame header"
+        header += chunk
+    _version, _flags = struct.unpack(">BB", header[0:2])
+    stream = struct.unpack(">H", header[2:4])[0]
+    opcode = header[4]
+    length = struct.unpack(">I", header[5:9])[0]
+    body = b""
+    while len(body) < length:
+        chunk = sock.recv(length - len(body))
+        assert chunk, "Connection closed while reading frame body"
+        body += chunk
+    return stream, opcode, body
+
+
+@dataclasses.dataclass
+class ExecuteResult:
+    """Parsed outcome of a ROWS EXECUTE response."""
+
+    metadata_changed: bool
+    no_metadata: bool
+    column_count: int
+    result_metadata_id: bytes | None
+
+
+def _cql_connect(host: str, port: int, username: str, password: str) -> socket.socket:
+    """
+    Open a raw TCP socket to *host*:*port* and perform the CQL v4 handshake,
+    negotiating the SCYLLA_USE_METADATA_ID extension so that result_metadata_id
+    is exchanged on the wire — identical to the mandatory CQL v5 behaviour.
+    """
+    sock = socket.create_connection((host, port))
+    stream = 1
+
+    # STARTUP with SCYLLA_USE_METADATA_ID enables the v5-style metadata_id
+    # exchange for this v4 connection.
+    startup_opts = {"CQL_VERSION": _CQL_VERSION, "SCYLLA_USE_METADATA_ID": ""}
+    sock.sendall(_frame(_OP_STARTUP, _string_map(startup_opts), stream))
+    _, opcode, payload = _recv_frame(sock)
+
+    if opcode == _OP_READY:
+        return sock
+
+    assert opcode == _OP_AUTHENTICATE, (
+        f"Expected AUTHENTICATE(0x{_OP_AUTHENTICATE:02x}), got 0x{opcode:02x}"
+    )
+
+    # PlainText SASL token: NUL + username + NUL + password
+    creds = b"\x00" + username.encode() + b"\x00" + password.encode()
+    stream += 1
+    sock.sendall(_frame(_OP_AUTH_RESPONSE, _short_bytes(creds), stream))
+    _, auth_op, _ = _recv_frame(sock)
+    assert auth_op == _OP_AUTH_SUCCESS, f"Authentication failed: opcode=0x{auth_op:02x}"
+    return sock
+
+
+def _cql_prepare(sock: socket.socket, stream: int, query: str) -> bytes:
+    """PREPARE *query* and return the server-assigned query_id."""
+    sock.sendall(_frame(_OP_PREPARE, _long_string(query), stream))
+    _, opcode, payload = _recv_frame(sock)
+    assert opcode == _OP_RESULT, f"Expected RESULT, got 0x{opcode:02x}"
+
+    pos = 0
+    kind = struct.unpack(">I", payload[pos : pos + 4])[0]
+    pos += 4
+    assert kind == _RESULT_KIND_PREPARED, f"Expected PREPARED kind, got {kind}"
+
+    id_len = struct.unpack(">H", payload[pos : pos + 2])[0]
+    pos += 2
+    return bytes(payload[pos : pos + id_len])
+
+
+def _cql_execute_with_metadata_id(
+    sock: socket.socket,
+    stream: int,
+    query_id: bytes,
+    result_metadata_id: bytes,
+    consistency: int = _DEFAULT_CONSISTENCY,
+) -> ExecuteResult:
+    """
+    Send EXECUTE carrying *result_metadata_id* on the wire.
+
+    With SCYLLA_USE_METADATA_ID active the server reads result_metadata_id
+    immediately after query_id (before the options block), mirroring CQL v5
+    wire format.  SKIP_METADATA is set so a normal response returns no column
+    specs; only the METADATA_CHANGED promotion path returns actual metadata.
+    """
+    # options block: [consistency: uint16][flags: byte]
+    options = struct.pack(">HB", consistency, _FLAG_SKIP_METADATA)
+    body = _short_bytes(query_id) + _short_bytes(result_metadata_id) + options
+    sock.sendall(_frame(_OP_EXECUTE, body, stream))
+    _, opcode, payload = _recv_frame(sock)
+    assert opcode == _OP_RESULT, f"Expected RESULT, got 0x{opcode:02x}"
+
+    pos = 0
+    kind = struct.unpack(">I", payload[pos : pos + 4])[0]
+    pos += 4
+    assert kind == _RESULT_KIND_ROWS, f"Expected ROWS kind, got {kind}"
+
+    meta_flags = struct.unpack(">I", payload[pos : pos + 4])[0]
+    pos += 4
+    column_count = struct.unpack(">I", payload[pos : pos + 4])[0]
+    pos += 4
+
+    metadata_changed = bool(meta_flags & _META_METADATA_CHANGED)
+    no_metadata = bool(meta_flags & _META_NO_METADATA)
+
+    response_metadata_id: bytes | None = None
+    if metadata_changed:
+        id_len = struct.unpack(">H", payload[pos : pos + 2])[0]
+        pos += 2
+        response_metadata_id = bytes(payload[pos : pos + id_len])
+
+    return ExecuteResult(
+        metadata_changed=metadata_changed,
+        no_metadata=no_metadata,
+        column_count=column_count,
+        result_metadata_id=response_metadata_id,
+    )
+
+
+def _prepare_and_execute(
+    host: str, query: str, stale_metadata_id: bytes
+) -> ExecuteResult:
+    """
+    Open a raw socket connection (negotiating SCYLLA_USE_METADATA_ID), prepare
+    *query*, execute it with *stale_metadata_id*, and return the parsed result.
+    Intended to be called via ``asyncio.to_thread`` to avoid blocking the event loop.
+    """
+    sock = _cql_connect(host, 9042, "cassandra", "cassandra")
+    try:
+        stream = 1
+        stream += 1
+        query_id = _cql_prepare(sock, stream, query)
+        stream += 1
+        return _cql_execute_with_metadata_id(sock, stream, query_id, stale_metadata_id)
+    finally:
+        sock.close()
+
+
+@pytest.mark.asyncio
+async def test_list_roles_of_prepared_metadata_promotion(
+    manager: ManagerClient,
+) -> None:
+    """Verify that the server promotes the prepared metadata_id for statements
+    whose PREPARE response carries empty result metadata (NO_METADATA).
+
+    ``LIST ROLES OF <role>`` is such a statement: at PREPARE time the server
+    does not know the result set schema because the statement implementation
+    builds the metadata dynamically at execute time.  The server therefore
+    returns the metadata_id of empty metadata in the PREPARE response.
+
+    When the client later sends EXECUTE with SKIP_METADATA and the stale
+    empty metadata_id, the server should detect the mismatch (the actual rows
+    have real metadata) and respond with a ``METADATA_CHANGED`` result that
+    carries the real metadata_id so the client can update its cache.  This is
+    the behaviour mandated by CQL v5; on CQL v4 it is exercised via the
+    SCYLLA_USE_METADATA_ID Scylla protocol extension which enables the same
+    wire-level exchange.
+    """
+    server = await manager.server_add(config=auth_config)
+    cql, _ = await manager.get_ready_cql([server])
+
+    role = "r" + unique_name()
+    await cql.run_async(f"CREATE ROLE {role}")
+
+    # Any non-empty bytes that differ from the real metadata_id serves as the
+    # "stale" cache entry the client would send after a PREPARE that returned
+    # empty metadata.
+    stale_metadata_id = hashlib.sha256(b"").digest()[:16]
+
+    result = await asyncio.to_thread(
+        _prepare_and_execute, server.ip_addr, f"LIST ROLES OF {role}", stale_metadata_id
+    )
+
+    assert result.metadata_changed, (
+        f"expected EXECUTE for LIST ROLES OF {role} to return METADATA_CHANGED "
+        f"after PREPARE returned an empty result_metadata_id"
+    )
+    assert not result.no_metadata, (
+        f"expected EXECUTE for LIST ROLES OF {role} to not have NO_METADATA flag "
+        f"when METADATA_CHANGED is set"
+    )
+    assert result.result_metadata_id is not None, (
+        f"expected EXECUTE for LIST ROLES OF {role} to return a result_metadata_id "
+        f"alongside METADATA_CHANGED"
+    )
+
+
+@pytest.mark.asyncio
+@pytest.mark.skip_mode(
+    mode="release", reason="error injection is disabled in release mode"
+)
+async def test_list_roles_of_prepared_metadata_promotion_suppressed_by_injection(
+    manager: ManagerClient,
+) -> None:
+    """Verify that the ``skip_rows_metadata_changed_response`` error injection
+    suppresses the metadata promotion, leaving the response with NO_METADATA
+    and without METADATA_CHANGED.
+
+    This is the negative/regression counterpart of
+    ``test_list_roles_of_prepared_metadata_promotion``: it confirms that the
+    happy-path test is not a false positive by showing that the promotion can
+    be disabled, and that the injection point itself works correctly.
+    """
+    server = await manager.server_add(config=auth_config)
+    cql, _ = await manager.get_ready_cql([server])
+
+    role = "r" + unique_name()
+    await cql.run_async(f"CREATE ROLE {role}")
+
+    stale_metadata_id = hashlib.sha256(b"").digest()[:16]
+
+    async with inject_error(
+        manager.api, server.ip_addr, "skip_prepared_result_metadata_promotion"
+    ):
+        async with inject_error(
+            manager.api, server.ip_addr, "skip_rows_metadata_changed_response"
+        ):
+            result = await asyncio.to_thread(
+                _prepare_and_execute,
+                server.ip_addr,
+                f"LIST ROLES OF {role}",
+                stale_metadata_id,
+            )
+
+    assert not result.metadata_changed, (
+        f"expected injected EXECUTE for LIST ROLES OF {role} to suppress "
+        f"METADATA_CHANGED, but the flag was set"
+    )
+    assert result.no_metadata, (
+        f"expected injected EXECUTE for LIST ROLES OF {role} to keep the "
+        f"stale NO_METADATA path, but no_metadata flag was not set"
+    )

transport/server.cc

@@ -69,6 +69,7 @@
 #include "message/messaging_service.hh"
 #include "idl/forward_cql.dist.hh"
 #include "utils/bit_cast.hh"
+#include "utils/error_injection.hh"
 #include "utils/labels.hh"
 #include "utils/result.hh"
 #include "utils/reusable_buffer.hh"
@@ -1633,13 +1634,26 @@ process_execute_internal(service::client_state& client_state, sharded<cql3::quer
     }
 
     tracing::trace(trace_state, "Processing a statement");
-    return qp.local().execute_prepared_without_checking_exception_message(query_state, std::move(stmt), options, std::move(prepared), std::move(cache_key), needs_authorization)
-            .then([trace_state = query_state.get_trace_state(), skip_metadata, q_state = std::move(q_state), stream, version, metadata_id = std::move(metadata_id)] (auto msg) mutable {
+    auto cache_key_for_metadata = cache_key;
+    return qp.local().execute_prepared_without_checking_exception_message(query_state, std::move(stmt), options, prepared, std::move(cache_key), needs_authorization)
+            .then([trace_state = query_state.get_trace_state(), skip_metadata, q_state = std::move(q_state), stream, version, metadata_id = std::move(metadata_id), &qp, cache_key = std::move(cache_key_for_metadata), prepared = std::move(prepared)] (auto msg) mutable {
         if (msg->move_to_shard()) {
             return cql_server::process_fn_return_type(make_foreign(dynamic_pointer_cast<messages::result_message::bounce>(msg)));
         } else if (msg->is_exception()) {
             return cql_server::process_fn_return_type(convert_error_message_to_coordinator_result(msg.get()));
         } else {
+            if (prepared->result_metadata_is_empty()
+                    && metadata_id.has_request_metadata_id()
+                    && !utils::get_local_injector().enter("skip_prepared_result_metadata_promotion")) {
+                if (auto rows = dynamic_pointer_cast<messages::result_message::rows>(msg)) {
+                    auto rows_metadata_id = rows->rs().get_metadata().calculate_metadata_id();
+                    clogger.debug("prepared result metadata promotion: request_metadata_id_present={}, calculated_rows_metadata_id_size={}",
+                            metadata_id.has_request_metadata_id(), rows_metadata_id._metadata_id.size());
+                    qp.local().update_prepared_result_metadata_id(cache_key, rows_metadata_id);
+                    auto request_metadata_id = metadata_id.get_request_metadata_id();
+                    metadata_id = cql_metadata_id_wrapper(std::move(request_metadata_id), std::move(rows_metadata_id));
+                }
+            }
             tracing::trace(q_state->query_state.get_trace_state(), "Done processing - preparing a result");
             return cql_server::process_fn_return_type(make_foreign(make_result(stream, *msg, q_state->query_state.get_trace_state(), version, std::move(metadata_id), skip_metadata)));
         }
@@ -2507,9 +2521,16 @@ void cql_server::response::write(const cql3::metadata& m, const cql_metadata_id_
     cql3::cql_metadata_id_type calculated_metadata_id{bytes{}};
     if (metadata_id.has_request_metadata_id() && metadata_id.has_response_metadata_id()) {
         if (metadata_id.get_request_metadata_id() != metadata_id.get_response_metadata_id()) {
-            flags.remove<cql3::metadata::flag::NO_METADATA>();
-            flags.set<cql3::metadata::flag::METADATA_CHANGED>();
-            no_metadata = false;
+            const bool skip_rows_metadata_changed_response = utils::get_local_injector().enter("skip_rows_metadata_changed_response");
+            clogger.debug("rows metadata changed response: request_metadata_id_present={}, response_metadata_id_present={}, metadata_changed={}, no_metadata_before={}, injection_fired={}",
+                    metadata_id.has_request_metadata_id(), metadata_id.has_response_metadata_id(),
+                    metadata_id.get_request_metadata_id() != metadata_id.get_response_metadata_id(),
+                    no_metadata, skip_rows_metadata_changed_response);
+            if (!skip_rows_metadata_changed_response) {
+                flags.remove<cql3::metadata::flag::NO_METADATA>();
+                flags.set<cql3::metadata::flag::METADATA_CHANGED>();
+                no_metadata = false;
+            }
         }
     }