Merge pull request #835 from ajm188/handle_driver_timeout_error

Add a check to rows.Err after processing all rows

Author: timvaillancourt

go/logic/applier.go

@@ -370,6 +370,8 @@ func (this *Applier) ReadMigrationMinValues(uniqueKey *sql.UniqueKey) error {
 		}
 	}
 	this.migrationContext.Log.Infof("Migration min values: [%s]", this.migrationContext.MigrationRangeMinValues)
+
+	err = rows.Err()
 	return err
 }
 
@@ -391,6 +393,8 @@ func (this *Applier) ReadMigrationMaxValues(uniqueKey *sql.UniqueKey) error {
 		}
 	}
 	this.migrationContext.Log.Infof("Migration max values: [%s]", this.migrationContext.MigrationRangeMaxValues)
+
+	err = rows.Err()
 	return err
 }
 
@@ -443,6 +447,9 @@ func (this *Applier) CalculateNextIterationRangeEndValues() (hasFurtherRange boo
 			}
 			hasFurtherRange = true
 		}
+		if err = rows.Err(); err != nil {
+			return hasFurtherRange, err
+		}
 		if hasFurtherRange {
 			this.migrationContext.MigrationIterationRangeMaxValues = iterationRangeMaxValues
 			return hasFurtherRange, nil