PageReadStore (Apache Parquet Column 1.13.1 API)

```
public interface PageReadStore
```
contains all the readers for all the columns of the corresponding row group TODO: rename to RowGroup?

Method Summary

All Methods Instance Methods Abstract Methods Default Methods
Modifier and Type	Method	Description
`PageReader`	`getPageReader(ColumnDescriptor descriptor)`
`long`	`getRowCount()`
`default Optional<PrimitiveIterator.OfLong>`	`getRowIndexes()`	Returns the indexes of the rows to be read/built if the related data is available.
`default Optional<Long>`	`getRowIndexOffset()`

- Method Detail
  - getPageReader
```
PageReader getPageReader(ColumnDescriptor descriptor)
```
    Parameters:
    
    descriptor - the descriptor of the column
    
    Returns:
    
    the page reader for that column
  - getRowCount
```
long getRowCount()
```
    Returns:
    
    the total number of rows in that row group
  - getRowIndexOffset
```
default Optional<Long> getRowIndexOffset()
```
    Returns:
    
    the optional of the long representing the row index offset of this row group or an empty optional if the related data is not available
  - getRowIndexes
```
default Optional<PrimitiveIterator.OfLong> getRowIndexes()
```
    Returns the indexes of the rows to be read/built if the related data is available. All the rows which index is not returned shall be skipped.
    
    Returns:
    
    the optional of the incremental iterator of the row indexes or an empty optional if the related data is not available