guiyanakuang commented on PR #1960:
URL: https://github.com/apache/orc/pull/1960#issuecomment-2208881314
```
private void setIsRepeatingIfNeeded(DecimalColumnVector result, int
index) {
if (result.isRepeating && index > 0 &&
(!result.vector[0].equals(result.vector[index]) ||
result.isNull[0] != result.isNull[index])) {
result.isRepeating = false;
}
}
```
`result.vector[0].equals(result.vector[index])` We cannot directly perform
this check because:
```
public DecimalColumnVector(int size, int precision, int scale) {
super(Type.DECIMAL, size);
this.precision = (short) precision;
this.scale = (short) scale;
vector = new HiveDecimalWritable[size];
for (int i = 0; i < size; i++) {
vector[i] = new HiveDecimalWritable(0); // Initially zero.
}
}
```
The initial value `new HiveDecimalWritable(0)` will be used, and we can only
use `result.vector[0]` for comparison after ensuring `result.isNull[0] ==
false`.
cc @cxzl25
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