com.facebook.presto.parquet.reader

Class ListColumnReader

java.lang.Object

com.facebook.presto.parquet.reader.ListColumnReader

public class ListColumnReader
extends Object

Method Summary

Modifier and Type

Method and Description

static void

calculateCollectionOffsets(Field field, it.unimi.dsi.fastutil.ints.IntList offsets, it.unimi.dsi.fastutil.booleans.BooleanList collectionIsNull, int[] definitionLevels, int[] repetitionLevels) Each collection (Array or Map) has four variants of presence: 1) Collection is not defined, because one of it's optional parent fields is null 2) Collection is null 3) Collection is defined but empty 4) Collection is defined and not empty.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

calculateCollectionOffsets

public static void calculateCollectionOffsets(Field field,
                                              it.unimi.dsi.fastutil.ints.IntList offsets,
                                              it.unimi.dsi.fastutil.booleans.BooleanList collectionIsNull,
                                              int[] definitionLevels,
                                              int[] repetitionLevels)

Each collection (Array or Map) has four variants of presence: 1) Collection is not defined, because one of it's optional parent fields is null 2) Collection is null 3) Collection is defined but empty 4) Collection is defined and not empty. In this case offset value is increased by the number of elements in that collection