ParquetReader.read(InputFile) always causes exception on build
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- Java
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Description
The [`ParquetReader.read(InputFile file)`](https://www.javadoc.io/static/org.apache.parquet/parquet-hadoop/1.11.1/org/apache/parquet/hadoop/ParquetReader.html#read-org.apache.parquet.io.InputFile-) static factory method in `parquet-hadoop` creates a builder from an `InputFile`. This method always throws an `IllegalArgumentException` when `.build()` is subsequently called.
```java
java.nio.Path parquetFile = getParquetFile();
ParquetReader.read(HadoopInputFile.fromPath(new org.apache.hadoop.fs.Path(parquetFile.toUri()), new Configuration()))
.build();
```
```
java.lang.IllegalArgumentException: [BUG] Classes that extend Builder should override getReadSupport()
at org.apache.parquet.Preconditions.checkArgument(Preconditions.java:53)
at org.apache.parquet.hadoop.ParquetReader$Builder.getReadSupport(ParquetReader.java:310)
at org.apache.parquet.hadoop.ParquetReader$Builder.build(ParquetReader.java:337)
```
The issue appears to be that the [`build()`](https://www.javadoc.io/static/org.apache.parquet/parquet-hadoop/1.11.1/org/apache/parquet/hadoop/ParquetReader.Builder.html#build--) method enforces that a [`ReadSupport`](https://www.javadoc.io/static/org.apache.parquet/parquet-hadoop/1.11.1/org/apache/parquet/hadoop/api/ReadSupport.html) value was set on the builder, but `ParquetReader.read(InputFile file)` doesn't take accept a `ReadSupport`, nor is there a way to set it after the builder has been created.
For context, my use case is reading Parquet files directly from Java.
## Expected behavior
I wouldn't expect a method to exist that always results in an exception being thrown. I would expect the `ParquetReader.read(InputFile file)` to be fixed, replaced, or removed.
## Workaround
I am able to achieve my goal by using [`ParquetFileReader.open(InputFile)`](https://www.javadoc.io/static/org.apache.parquet/parquet-hadoop/1.11.1/org/apache/parquet/hadoop/ParquetFileReader.html#open-org.apache.parquet.io.InputFile-) instead of `ParquetReader.read(InputFile)`.
```java
java.nio.Path parquetFile = getParquetFile();
ParquetFileReader reader = ParquetFileReader.open(
HadoopInputFile.fromPath(new org.apache.hadoop.fs.Path(parquetFile.toUri()), new Configuration()));
```
**Reporter**: [M. Justin](https://issues.apache.org/jira/secure/ViewProfile.jspa?name=mjjustin)
**Note**: *This issue was originally created as [PARQUET-1912](https://issues.apache.org/jira/browse/PARQUET-1912). Please see the [migration documentation](https://issues.apache.org/jira/browse/PARQUET-2502) for further details.*
Contributor guide
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Research direction
Start with ParquetReader.read(InputFile), then follow the returned Builder into build() and its getReadSupport() check. Reproduce the failure with HadoopInputFile.fromPath and compare it with the working ParquetFileReader.open(InputFile) path. Done means the documented factory no longer fails immediately, with behavior covered by a regression test.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- java
- Domain
- data
- Issue type
- Bug
- Difficulty
- 3/5
- Estimated time
- 1-2 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 35/100