guiyanakuang commented on PR #1244:
URL: https://github.com/apache/orc/pull/1244#issuecomment-1241809732
Thank you for making a PR, @cxzl25
I've done some investigation into this issue. `decimalColVector.reset()`
seems to fix only part of the bug. I think the fundamental issue is that ORC is
missing code to check and set isRepeating when reading all decimal vectors that
are not null.
Make a few simple changes in your test code, the first 1024 values we set to
1.
```java
VectorizedRowBatch b = schema.createRowBatch();
DecimalColumnVector f1 = (DecimalColumnVector) b.cols[0];
f1.isRepeating = true;
f1.set(0, HiveDecimal.create(1));
b.size = 1024;
w.addRowBatch(b);
// skip some code
assertTrue(batch.cols[0].isRepeating); // We actually get false.
```
There is no code to check and set isRepeating to a filled vector.
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