FlyingZC commented on PR #21992:
URL: https://github.com/apache/shardingsphere/pull/21992#issuecomment-1325827249
When call `next` method,
```java
public final boolean next() {
if (rows.hasNext()) {
currentRow = rows.next();
rowCount--;
return true;
}
// when rows.hasNext() is false, this line will set currentRow = null and
`wasNull()` method will return true before,but return false now.
currentRow = null;
return false;
}
```
when rows.hasNext() is false, this line will set currentRow = null and
`wasNull()` method will return true before,but return false now.
wasNull method before:
```java
public final boolean wasNull() {
// return true;
return null == currentRow;
}
```
wasNull method now:
```java
public final boolean wasNull() {
// return false;
return wasNull;
}
```
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