Remove unused fields in Span struct

src/pg_tracing.h

@@ -197,9 +197,6 @@ typedef struct Span
 	SpanType	type;			/* Type of the span. Used to generate the
 								 * span's name */
 
-	bool		parallel_aware;
-	bool		async_capable;
-
 	int8		nested_level;	/* Nested level of this span this span.
 								 * Internal usage only */
 	int8		parent_planstate_index; /* Index to the parent planstate of

src/pg_tracing_planstate.c

@@ -602,9 +602,6 @@ create_span_node(PlanState *planstate, const planstateTraceContext * planstateTr
 		const char *operation_name;
 		int			len_operation_name;
 
-		span.parallel_aware = plan->parallel_aware;
-		span.async_capable = plan->async_capable;
-
 		operation_name = plan_to_rel_name(planstateTraceContext, planstate);
 		len_operation_name = strlen(operation_name);
 		if (len_operation_name > 0)

src/pg_tracing_span.c

@@ -41,8 +41,6 @@ begin_span(TraceId trace_id, Span * span, SpanType type,
 	else
 		span->span_id = pg_prng_uint64(&pg_global_prng_state);
 
-	span->parallel_aware = false;
-	span->async_capable = false;
 	span->worker_id = -1;
 	span->operation_name_offset = -1;
 	span->num_parameters = 0;