*: Hide "Mem" column from SHOW PROCESSSLIST (pingcap#8543)

Author: morgo

executor/executor_pkg_test.go

@@ -57,9 +57,9 @@ func (msm *mockSessionManager) Kill(cid uint64, query bool) {
 
 func (s *testExecSuite) TestShowProcessList(c *C) {
 	// Compose schema.
-	names := []string{"Id", "User", "Host", "db", "Command", "Time", "State", "Info", "Mem"}
+	names := []string{"Id", "User", "Host", "db", "Command", "Time", "State", "Info"}
 	ftypes := []byte{mysql.TypeLonglong, mysql.TypeVarchar, mysql.TypeVarchar,
-		mysql.TypeVarchar, mysql.TypeVarchar, mysql.TypeLong, mysql.TypeVarchar, mysql.TypeString, mysql.TypeLonglong}
+		mysql.TypeVarchar, mysql.TypeVarchar, mysql.TypeLong, mysql.TypeVarchar, mysql.TypeString}
 	schema := buildSchema(names, ftypes)
 
 	// Compose a mocked session manager.

executor/show.go

@@ -236,7 +236,6 @@ func (e *ShowExec) fetchShowProcessList() error {
 			uint64(time.Since(pi.Time) / time.Second),
 			fmt.Sprintf("%d", pi.State),
 			info,
-			pi.Mem,
 		})
 	}
 	return nil

planner/core/planbuilder.go

@@ -1662,9 +1662,9 @@ func buildShowSchema(s *ast.ShowStmt) (schema *expression.Schema) {
 			mysql.TypeVarchar, mysql.TypeVarchar, mysql.TypeVarchar, mysql.TypeVarchar, mysql.TypeVarchar,
 		}
 	case ast.ShowProcessList:
-		names = []string{"Id", "User", "Host", "db", "Command", "Time", "State", "Info", "Mem"}
+		names = []string{"Id", "User", "Host", "db", "Command", "Time", "State", "Info"}
 		ftypes = []byte{mysql.TypeLonglong, mysql.TypeVarchar, mysql.TypeVarchar,
-			mysql.TypeVarchar, mysql.TypeVarchar, mysql.TypeLong, mysql.TypeVarchar, mysql.TypeString, mysql.TypeLonglong}
+			mysql.TypeVarchar, mysql.TypeVarchar, mysql.TypeLong, mysql.TypeVarchar, mysql.TypeString}
 	case ast.ShowStatsMeta:
 		names = []string{"Db_name", "Table_name", "Partition_name", "Update_time", "Modify_count", "Row_count"}
 		ftypes = []byte{mysql.TypeVarchar, mysql.TypeVarchar, mysql.TypeVarchar, mysql.TypeDatetime, mysql.TypeLonglong, mysql.TypeLonglong}

session/session.go

@@ -1509,7 +1509,6 @@ func (s *session) ShowProcess() util.ProcessInfo {
 	tmp := s.processInfo.Load()
 	if tmp != nil {
 		pi = tmp.(util.ProcessInfo)
-		pi.Mem = s.GetSessionVars().StmtCtx.MemTracker.BytesConsumed()
 	}
 	return pi
 }

util/processinfo.go

@@ -27,7 +27,6 @@ type ProcessInfo struct {
 	Time    time.Time
 	State   uint16
 	Info    string
-	Mem     int64
 }
 
 // SessionManager is an interface for session manage. Show processlist and