apache / apache/parquet-java

ParquetReader.read(InputFile) always causes exception on build

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Component: Parquet Priority: Major Type: bug
Lingua principale
Java
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Descrizione

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.*

Guida per i contributori

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Direzione di ricerca

Inizia con ParquetReader.read(InputFile), quindi segui il Builder restituito fino a build() e al relativo controllo di getReadSupport(). Riproduci il fallimento con HadoopInputFile.fromPath e confrontalo con il percorso funzionante ParquetFileReader.open(InputFile). Il lavoro è completato quando la factory documentata non fallisce più immediatamente e il comportamento è coperto da un test di regressione.

Scritto dal modello di indicizzazione a partire dal testo della issue.

Valutazione

Stack tecnologico
java
Ambito
data
Tipo di issue
Bug
Difficoltà
3/5
Tempo stimato
1-2 giorni
Stato di attività
Ferma
Chiarezza
Abbastanza chiara
Idoneità per principianti
35/100

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