Package net.snowflake.client.core.arrow

Class ArrowVectorConverterUtil

java.lang.Object

net.snowflake.client.core.arrow.ArrowVectorConverterUtil

@SnowflakeJdbcInternalApi
public final class ArrowVectorConverterUtil
extends Object

Method Summary

Modifier and Type	Method	Description
static SnowflakeType	getSnowflakeTypeFromFieldMetadata(org.apache.arrow.vector.types.pojo.Field field)
static ArrowVectorConverter	initConverter(org.apache.arrow.vector.FieldVector vector, DataConversionContext context, int columnIndex)
static ArrowVectorConverter	initConverter(org.apache.arrow.vector.ValueVector vector, DataConversionContext context, SFBaseSession session, int idx)	Given an arrow vector (a single column in a single record batch), return an arrow vector converter.

Methods inherited from class java.lang.Object

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

Method Detail

getSnowflakeTypeFromFieldMetadata

public static SnowflakeType getSnowflakeTypeFromFieldMetadata(org.apache.arrow.vector.types.pojo.Field field)

initConverter

public static ArrowVectorConverter initConverter(org.apache.arrow.vector.ValueVector vector,
                                                 DataConversionContext context,
                                                 SFBaseSession session,
                                                 int idx)
                                          throws SnowflakeSQLException

Given an arrow vector (a single column in a single record batch), return an arrow vector converter. Note, converter is built on top of arrow vector, so that arrow data can be converted back to java data

Arrow converter mappings for Snowflake fixed-point numbers ----------------------------------------------------------------------------------------- Max position and scale Converter ----------------------------------------------------------------------------------------- number(3,0) TinyIntToFixedConverter number(3,2) TinyIntToScaledFixedConverter number(5,0) SmallIntToFixedConverter number(5,4) SmallIntToScaledFixedConverter number(10,0) IntToFixedConverter number(10,9) IntToScaledFixedConverter number(19,0) BigIntToFixedConverter number(19,18) BigIntToFixedConverter number(38,37) DecimalToScaledFixedConverter ------------------------------------------------------------------------------------------

Parameters:

vector - an arrow vector

context - data conversion context

session - SFBaseSession for purposes of logging

idx - the index of the vector in its batch

Returns:

A converter on top og the vector

Throws:

SnowflakeSQLException - if error encountered

initConverter

public static ArrowVectorConverter initConverter(org.apache.arrow.vector.FieldVector vector,
                                                 DataConversionContext context,
                                                 int columnIndex)
                                          throws SnowflakeSQLException

Throws:

SnowflakeSQLException