[GitHub] [incubator-iceberg] xabriel opened a new pull request #372: Allow read split behavior overrides

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

xabriel opened a new pull request #372: Allow read split behavior overrides
URL: https://github.com/apache/incubator-iceberg/pull/372
 
 
   Iceberg exposes the following read path properties as of today:
   
   `read.split.target-size`
   `read.split.planning-lookback`
   `read.split.open-file-cost`
   
   However, these properties must be set at the `Table.properties()` level to be effective.
   
   In this PR, we allow these read flags to override behavior of a `Scan` object:
   
   ```java
   TableScan scan = table.newScan()
           .splitOptions(
               new SplitOptions()
                   .splitSize(256L * 1024 * 1024));
   ```
   
   They can also be passed in as a `DataFrameReader` option:
   
   ```java
   Dataset<Row> resultDf = spark.read()
       .format("iceberg")
       .option(TableProperties.SPLIT_SIZE, String.valueOf(256L * 1024 * 1024))
       .load(tableLocation);
   ```

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