latest_query_id auto increment caused pg_stat_statements inflate

[hslightdb]

the following code
/*

• HACK: We have to mark each Query with a unique
• id in order to recognize them properly.
  */
  #define QUERY_ID_INITIAL 0
  static uint64 latest_query_id = QUERY_ID_INITIAL;

void
assign_query_id(Query *query)
{
uint64 prev_id = latest_query_id++;

if (prev_id > latest_query_id)
	elog(WARNING, "assign_query_id(): queryId overflow");

query->queryId = latest_query_id;

}
cause queryId changed every request, so pg_stat_statements cannot agg by queryId, finally it's inflate. but we don't find any where that use queryId in pg_pathman.

We have to mark each Query with a unique

• id in order to recognize them properly
  so can you help to explain what is the purpose and which place use it?

[hslightdb]

what if we remove assign_query_id() call?