io.delta.kernel.internal.util

Class VectorUtils

Object

io.delta.kernel.internal.util.VectorUtils

public final class VectorUtils
extends Object

Method Summary

Modifier and Type	Method and Description
static ArrayValue	stringArrayValue(java.util.List<String> values) Creates an ArrayValue from list of strings.
static MapValue	stringStringMapValue(java.util.Map<String,String> keyValues) Creates a MapValue from map of string keys and string values.
static ColumnVector	stringVector(java.util.List<String> values) Utility method to create a ColumnVector for given list of strings.
static <T> java.util.List<T>	toJavaList(ArrayValue arrayValue) Converts an ArrayValue to a Java list.
static <K,V> java.util.Map<K,V>	toJavaMap(MapValue mapValue) Converts a MapValue to a Java map.

Methods inherited from class Object

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

Method Detail

toJavaList

public static <T> java.util.List<T> toJavaList(ArrayValue arrayValue)

Converts an ArrayValue to a Java list. Any nested complex types are also converted to their Java type.

toJavaMap

public static <K,V> java.util.Map<K,V> toJavaMap(MapValue mapValue)

Converts a MapValue to a Java map. Any nested complex types are also converted to their Java type.

Please note not all key types override hashCode/equals. Be careful when using with keys of: - Struct type at any nesting level (i.e. ArrayType(StructType) does not) - Binary type

stringArrayValue

public static ArrayValue stringArrayValue(java.util.List<String> values)

Creates an ArrayValue from list of strings. The type array(string) is a common occurrence in Delta Log schema. We don't have any non-string array type in Delta Log. If we end up needing to support other types, we can make this generic.

Parameters:

values - list of strings

Returns:

an ArrayValue with the given values of type StringType

stringStringMapValue

public static MapValue stringStringMapValue(java.util.Map<String,String> keyValues)

Creates a MapValue from map of string keys and string values. The type map(string -> string) is a common occurrence in Delta Log schema.

Parameters:

keyValues -

Returns:

stringVector

public static ColumnVector stringVector(java.util.List<String> values)

Utility method to create a ColumnVector for given list of strings.

Parameters:

values - list of strings

Returns:

a ColumnVector with the given values of type StringType