Add test case

Signed-off-by: Frank Chen <frank.chen021@outlook.com>

src/Common/OpenTelemetryTraceContext.cpp

@@ -232,11 +232,11 @@ void TracingContext::deserialize(ReadBuffer & buf)
     {
         buf >> "tracing: "
             >> this->trace_id
-            >> " "
+            >> "\n"
             >> this->span_id
-            >> " "
+            >> "\n"
             >> this->tracestate
-            >> " "
+            >> "\n"
             >> this->trace_flags
             >> "\n";
     }
@@ -246,11 +246,11 @@ void TracingContext::serialize(WriteBuffer & buf) const
 {
     buf << "tracing: "
         << this->trace_id
-        << " "
+        << "\n"
         << this->span_id
-        << " "
+        << "\n"
         << this->tracestate
-        << " "
+        << "\n"
         << this->trace_flags
         << "\n";
 }

tests/queries/0_stateless/02423_ddl_for_opentelemetry.reference

@@ -0,0 +1,8 @@
+1
+1
+2
+===case 2====
+1
+1
+exception_code=60
+exception_code=60

tests/queries/0_stateless/02423_ddl_for_opentelemetry.sh

@@ -0,0 +1,92 @@
+#!/usr/bin/env bash
+# Tags: distributed
+
+CURDIR=$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)
+# shellcheck source=../shell_config.sh
+. "$CURDIR"/../shell_config.sh
+
+# This function takes following arguments:
+# $1 - OpenTelemetry Trace Id
+# $2 - Query
+# $3 - Query Settings
+# $4 - Output device, default is stdout
+function execute_query()
+{
+    if [ -n "${4}" ]; then
+        output=$4
+    else
+        output="/dev/stdout"
+    fi
+
+    echo $2 | ${CLICKHOUSE_CURL} \
+                -X POST \
+                -H "traceparent: 00-$1-5150000000000515-01" \
+                -H "tracestate: a\nb cd" \
+                "${CLICKHOUSE_URL}?${3}" \
+                --data @- \
+                > $output
+}
+
+# This function takes 3 argument:
+# $1 - OpenTelemetry Trace Id
+# $2 - Fields
+# $3 - operation_name pattern
+function check_span()
+{
+${CLICKHOUSE_CLIENT} -nq "
+    SYSTEM FLUSH LOGS;
+
+    SELECT ${2}
+    FROM system.opentelemetry_span_log
+    WHERE finish_date >= yesterday()
+    AND   lower(hex(trace_id)) =    '${1}'
+    AND   operation_name       like '${3}'
+    ;"
+}
+
+#
+# Set up
+#
+${CLICKHOUSE_CLIENT} -q "
+DROP TABLE IF EXISTS ddl_test_for_opentelemetry;
+"
+
+#
+# Case 1, a normal case
+#
+trace_id=$(${CLICKHOUSE_CLIENT} -q "select lower(hex(generateUUIDv4()))");
+execute_query $trace_id "CREATE TABLE ddl_test_for_opentelemetry ON CLUSTER test_shard_localhost (id UInt64) Engine=MergeTree ORDER BY id" "distributed_ddl_output_mode=none"
+
+check_span $trace_id "count()" "HTTPHandler"
+check_span $trace_id "count()" "%DDLWorker::processTask%"
+
+# There should be two 'query' spans,
+# one is for the HTTPHandler, the other is for the DDL executing in DDLWorker
+check_span $trace_id "count()" "query"
+
+# Echo a separator so that the reference file is more clear for reading
+echo "===case 2===="
+
+#
+# Case 2, an exceptional case, DROP a non-exist table
+#
+trace_id=$(${CLICKHOUSE_CLIENT} -q "select lower(hex(generateUUIDv4()))");
+
+# Since this query is supposed to fail, we redirect the error message to /dev/null to discard the error message so that it won't pollute the reference file.
+# The exception will be checked in the span log
+execute_query $trace_id "DROP TABLE ddl_test_for_opentelemetry_non_exist ON CLUSTER test_shard_localhost" "distributed_ddl_output_mode=none" "/dev/null"
+
+check_span $trace_id "count()" "HTTPHandler"
+check_span $trace_id "count()" "%DDLWorker::processTask%"
+
+# There should be two 'query' spans,
+# one is for the HTTPHandler, the other is for the DDL executing in DDLWorker.
+# Both of these two spans contain exception
+check_span $trace_id "concat('exception_code=', attribute['clickhouse.exception_code'])" "query"
+
+#
+# Tear down
+#
+${CLICKHOUSE_CLIENT} -q "
+DROP TABLE IF EXISTS ddl_test_for_opentelemetry;
+"