Fix uninitialized memory in Command_Counter::_counters

Replace _counters{} initialization syntax with explicit memset() to ensure
the _counters array is properly zero-initialized. The _counters{} syntax
may not reliably zero-initialize arrays in all compiler implementations,
causing Valgrind to report use of uninitialized values when
add_and_reset() reads from the array.

Also remove the safety checks added previously since the root cause
is now properly fixed.

include/Command_Counter.h

@@ -3,10 +3,9 @@
 
 class Command_Counter {
 public:
-	Command_Counter(int cmd_idx, int col_count, char** cmd_desc) : _counters{}, _total_time(0), _cmd_idx(cmd_idx), 
+	Command_Counter(int cmd_idx, int col_count, char** cmd_desc) : _total_time(0), _cmd_idx(cmd_idx),
 		_col_count(col_count), _cmd_desc(cmd_desc) {
-
-		//memset(_counters, 0, sizeof(_counters));
+		memset(_counters, 0, sizeof(_counters));
 	}
 	void add_and_reset(Command_Counter* cc) {
 		for (int j = 0; j < static_cast<int>(sizeof(_counters)/sizeof(_counters[0])); j++) {

lib/PgSQL_Query_Processor.cpp

@@ -245,7 +245,9 @@ PgSQL_Query_Processor::~PgSQL_Query_Processor() {
 
 void PgSQL_Query_Processor::update_query_processor_stats() {
 	Query_Processor::update_query_processor_stats();
-	for (int i = 0; i < PGSQL_QUERY___NONE; i++) commands_counters[i]->add_and_reset(_thr_commands_counters[i]);
+	for (int i = 0; i < PGSQL_QUERY___NONE; i++) {
+		commands_counters[i]->add_and_reset(_thr_commands_counters[i]);
+	}
 }
 
 void PgSQL_Query_Processor::init_thread() {