uk.ac.starlink.parquet

Class InputColumns

java.lang.Object

uk.ac.starlink.parquet.InputColumns

public class InputColumns
extends Object

Provides InputColumn instances that know how to read parquet column data.

Since:

24 Feb 2021

Author:

Mark Taylor

Field Summary

Fields

Modifier and Type	Field and Description
static byte	BAD_BYTE
static int	BAD_INT
static long	BAD_LONG
static short	BAD_SHORT

Method Summary

Modifier and Type	Method and Description
static InputColumn<?>	createInputColumn(org.apache.parquet.schema.MessageType schema, String[] path) Returns an InputColumn for reading a given column from a parquet file.

Methods inherited from class java.lang.Object

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

Field Detail

BAD_BYTE

public static final byte BAD_BYTE

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Constant Field Values

BAD_SHORT

public static final short BAD_SHORT

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Constant Field Values

BAD_INT

public static final int BAD_INT

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Constant Field Values

BAD_LONG

public static final long BAD_LONG

See Also:

Constant Field Values

Method Detail

createInputColumn

public static InputColumn<?> createInputColumn(org.apache.parquet.schema.MessageType schema,
                                               String[] path)

Returns an InputColumn for reading a given column from a parquet file.

Parameters:

schema - table schema

path - table column identifier

Returns:

input column reader, or null if the column type is not supported