All Known Implementing Classes:

BooleanColumnReader, ByteColumnReader, DecimalColumnReader, DoubleColumnReader, FloatColumnReader, ListColumnReader, LongColumnReader, MapColumnReader, SliceColumnReader, SliceDictionaryColumnReader, SliceDirectColumnReader, StructColumnReader, TimeColumnReader, TimestampColumnReader, UnionColumnReader
```
public interface ColumnReader
```

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`void`	`close()`
`long`	`getRetainedSizeInBytes()`
`void`	`prepareNextRead(int batchSize)`
`Block`	`readBlock()`
`void`	`startRowGroup(InputStreamSources dataStreamSources)`
`void`	`startStripe(ZoneId fileTimeZone, InputStreamSources dictionaryStreamSources, ColumnMetadata<ColumnEncoding> encoding)`

Method Detail

readBlock

Block readBlock()
         throws IOException

Throws:: IOException

prepareNextRead

void prepareNextRead(int batchSize)

startStripe

void startStripe(ZoneId fileTimeZone,
                 InputStreamSources dictionaryStreamSources,
                 ColumnMetadata<ColumnEncoding> encoding)
          throws IOException

Throws:: IOException

startRowGroup

void startRowGroup(InputStreamSources dataStreamSources)
            throws IOException

Throws:: IOException

close
```
void close()
```

getRetainedSizeInBytes
```
long getRetainedSizeInBytes()
```

Interface ColumnReader

Method Summary

Method Detail

readBlock

prepareNextRead

startStripe

startRowGroup

close

getRetainedSizeInBytes