[GitHub] [arrow-cookbook] toddfarmer opened a new issue, #206: [Java] Parquet reading example fails with Arrow v8.0

[GitBox <gi...@apache.org>]

toddfarmer opened a new issue, #206:
URL: https://github.com/apache/arrow-cookbook/issues/206

   Changes to the Java APIs since version 7.0 result in the cookbook example [Query Data Content for File](https://arrow.apache.org/cookbook/java/dataset.html#query-data-content-for-file) no longer compiling.  The updated API appears to be used in [this test case](https://github.com/apache/arrow/blob/dc97883dee25ba8da55c7591060c44de2ea00865/java/dataset/src/test/java/org/apache/arrow/dataset/TestDataset.java#L78-L90), and the following modified cookbook code resulted in successful compilation/execution:
   
   ```java
       String uri = "file:" + System.getProperty("user.dir") + "/thirdpartydeps/parquetfiles/data1.parquet";
       ScanOptions options = new ScanOptions(/*batchSize*/ 100);
       try (
               BufferAllocator allocator = new RootAllocator();
               DatasetFactory datasetFactory = new FileSystemDatasetFactory(allocator, NativeMemoryPool.getDefault(), FileFormat.PARQUET, uri);
               Dataset dataset = datasetFactory.finish();
               Scanner scanner = dataset.newScan(options);
               VectorSchemaRoot vsr = VectorSchemaRoot.create(scanner.schema(), allocator)
       ) {
         scanner.scan().forEach(scanTask -> {
           VectorLoader loader = new VectorLoader(vsr);
           ArrowReader reader = scanTask.execute();
           try {
             while (reader.loadNextBatch()) {
               VectorSchemaRoot root = reader.getVectorSchemaRoot();
               final VectorUnloader unloader = new VectorUnloader(root);
               loader.load(unloader.getRecordBatch());
               System.out.print(vsr.contentToTSVString());
               System.out.println("DONE!");
             }
           } catch (IOException ex) {
             ex.printStackTrace();
           }
         });
       } catch (Exception e) {
         e.printStackTrace();
       }
   ```


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[GitHub] [arrow-cookbook] lidavidm closed issue #206: [Java] Parquet reading example fails with Arrow v8.0

[GitBox <gi...@apache.org>]

lidavidm closed issue #206: [Java] Parquet reading example fails with Arrow v8.0
URL: https://github.com/apache/arrow-cookbook/issues/206


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