RyanLin5967 opened a new issue, #920:
URL: https://github.com/apache/hudi-rs/issues/920
### Is there an existing issue for this?
- [x] I have searched the existing issues
### Description of the bug
Currently, a table bootstrapped in the default METADATA_ONLY mode is read
from its skeleton files alone, so every data column, the record key field
included, comes back NULL with no error. A FULL_RECORD bootstrap reads right.
### Steps To Reproduce
```python
import tempfile
from pyspark.sql import SparkSession
from hudi import HudiTableBuilder, HudiReadOptions
spark = (SparkSession.builder
.config("spark.jars.packages",
"org.apache.hudi:hudi-spark4.0-bundle_2.13:1.2.1")
.config("spark.serializer",
"org.apache.spark.serializer.KryoSerializer").getOrCreate())
src, path = tempfile.mkdtemp(), tempfile.mkdtemp()
spark.createDataFrame([("a", 1), ("b", 2)], "id STRING, v
LONG").write.mode("overwrite").parquet(src)
spark.createDataFrame([], "id STRING, v
LONG").write.format("hudi").options(**{
"hoodie.table.name": "t", "hoodie.datasource.write.recordkey.field":
"id",
"hoodie.datasource.write.keygenerator.class":
"org.apache.hudi.keygen.NonpartitionedKeyGenerator",
"hoodie.metadata.enable": "false", "hoodie.datasource.write.operation":
"bootstrap",
"hoodie.bootstrap.base.path": src}).mode("overwrite").save(path)
# the default mode selector is METADATA_ONLY, so path holds skeleton files
and the data stays in src
t = HudiTableBuilder.from_base_uri(path).build()
print([(r["id"], r["v"]) for b in t.read(HudiReadOptions()) for r in
b.to_pylist()])
# [(None, None), (None, None)], should be [('a', 1), ('b', 2)]
print(sorted((r["id"], r["v"]) for r in
spark.read.format("hudi").load(path).collect()))
# [('a', 1), ('b', 2)], so Hudi's Spark reader merges the skeleton files
with the source files
```
### Expected behavior
The read returns the source rows, as Spark's does, or refuses the table.
### Screenshots / Logs
_No response_
### Software information
- Operating system: macOS 26.7.1, arm64 (Darwin 25.6.0)
- Rust version: none, the PyPI wheel on Python 3.12.16
- Project version: hudi 0.5.0, and main (its CI wheel, 0.6.0.dev0)
- Writer: Hudi 1.2.1 (`hudi-spark4.0-bundle_2.13`) on pyspark 4.0.5, Java
21.0.12.1
### Additional context
After an upsert, the file groups it rewrote read right and the rest stay
NULL.
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