Clear schema table for new result set. Fixes #581

Author: bgrainger

src/MySqlConnector/MySql.Data.MySqlClient/MySqlDataReader.cs

@@ -59,12 +59,18 @@ internal async Task<bool> NextResultAsync(IOBehavior ioBehavior, CancellationTok
 					ActivateResultSet(nextResult);
 
 				m_resultSet = nextResult ?? new ResultSet(this);
+#if !NETSTANDARD1_3
+				m_schemaTable = null;
+#endif
 				return nextResult != null;
 			}
 			catch (MySqlException)
 			{
 				m_resultSet = new ResultSet(this);
 				m_resultSetBuffered = null;
+#if !NETSTANDARD1_3
+				m_schemaTable = null;
+#endif
 				throw;
 			}
 		}

tests/SideBySide/DataTypes.cs

@@ -1126,6 +1126,29 @@ private void DoGetSchemaTable(string column, string table, MySqlDbType mySqlDbTy
 				}
 			}
 		}
+
+		[Fact]
+		public void GetSchemaTableTwice()
+		{
+			using (var command = Connection.CreateCommand())
+			{
+				command.CommandText = "select Int16 from datatypes_integers; select Int32 from datatypes_integers;";
+				using (var reader = command.ExecuteReader())
+				{
+					var table = reader.GetSchemaTable();
+					Assert.Equal("Int16", table.Rows[0]["ColumnName"]);
+
+					while (reader.Read())
+					{
+					}
+
+					Assert.True(reader.NextResult());
+
+					table = reader.GetSchemaTable();
+					Assert.Equal("Int32", table.Rows[0]["ColumnName"]);
+				}
+			}
+		}
 #endif
 
 #if !BASELINE