feat(txn): add public method for getting the value of discarded field (#1788)

txn.go

@@ -760,6 +760,11 @@ func (txn *Txn) ReadTs() uint64 {
 	return txn.readTs
 }
 
+// Discarded returns the discarded value of the transaction.
+func (txn *Txn) Discarded() bool {
+	return txn.discarded
+}
+
 // NewTransaction creates a new transaction. Badger supports concurrent execution of transactions,
 // providing serializable snapshot isolation, avoiding write skews. Badger achieves this by tracking
 // the keys read and at Commit time, ensuring that these read keys weren't concurrently modified by

txn_test.go

@@ -952,3 +952,15 @@ func TestConflict(t *testing.T) {
 		runTest(t, testAndSetItr)
 	})
 }
+
+func TestTxnGetters(t *testing.T) {
+	t.Run("TxnDiscarded", func(t *testing.T) {
+		runBadgerTest(t, nil, func(t *testing.T, db *DB) {
+			txn := db.NewTransaction(true)
+			require.Equal(t, false, txn.Discarded())
+
+			txn.Discard()
+			require.Equal(t, true, txn.Discarded())
+		})
+	})
+}