mapshen opened a new issue #7694:
URL: https://github.com/apache/pinot/issues/7694
We run a realtime table `table1` with fields `X` in **upsert** mode. When a
new field `Y` is added to the schema, a simple `select` query in the Pinot
explorer will return the following error:
```
[
{
"message": "MergeResponseError:\nData schema mismatch between merged
block: [X(DOUBLE)] and block to merge: [X(DOUBLE),Y(DOUBLE)], drop block to
merge",
"errorCode": 500
}
]
```
The root cause seems to be that not all records are updated to have the `Y`
field after the schema change. In the worst case, some record will never
receive an update to contain that `Y` field.
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