org.apache.parquet.schema

Class ConversionPatterns

java.lang.Object

org.apache.parquet.schema.ConversionPatterns

public abstract class ConversionPatterns
extends Object

Utility functions to convert from Java-like map and list types to equivalent Parquet types.

Constructor Summary

Constructors

Constructor and Description
ConversionPatterns()

Method Summary

Modifier and Type	Method and Description
static GroupType	listOfElements(Type.Repetition listRepetition, String name, Type elementType) Creates a 3-level list structure annotated with LIST with elements of the given elementType.
static GroupType	listType(Type.Repetition repetition, String alias, Type nestedType) Deprecated. use listOfElements instead
static GroupType	mapType(Type.Repetition repetition, String alias, String mapAlias, Type keyType, Type valueType)
static GroupType	mapType(Type.Repetition repetition, String alias, Type keyType, Type valueType)
static GroupType	stringKeyMapType(Type.Repetition repetition, String alias, String mapAlias, Type valueType)
static GroupType	stringKeyMapType(Type.Repetition repetition, String alias, Type valueType)

Methods inherited from class java.lang.Object

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

Constructor Detail

ConversionPatterns

public ConversionPatterns()

Method Detail

mapType

public static GroupType mapType(Type.Repetition repetition,
                                String alias,
                                Type keyType,
                                Type valueType)

stringKeyMapType

public static GroupType stringKeyMapType(Type.Repetition repetition,
                                         String alias,
                                         String mapAlias,
                                         Type valueType)

stringKeyMapType

public static GroupType stringKeyMapType(Type.Repetition repetition,
                                         String alias,
                                         Type valueType)

mapType

public static GroupType mapType(Type.Repetition repetition,
                                String alias,
                                String mapAlias,
                                Type keyType,
                                Type valueType)

listType

@Deprecated
public static GroupType listType(Type.Repetition repetition,
                                             String alias,
                                             Type nestedType)

Deprecated. use listOfElements instead

Parameters:

repetition - repetition for the list

alias - name of the field

nestedType - type of elements in the list

Returns:

a group representing the list using a 2-level representation

listOfElements

public static GroupType listOfElements(Type.Repetition listRepetition,
                                       String name,
                                       Type elementType)

Creates a 3-level list structure annotated with LIST with elements of the given elementType. The repeated level is inserted automatically and the elementType's repetition should be the correct repetition of the elements, required for non-null and optional for nullable.

Parameters:

listRepetition - the repetition of the entire list structure

name - the name of the list structure type

elementType - the type of elements contained by the list

Returns:

a GroupType that represents the list