org.apache.calcite.adapter.enumerable

Enum JavaRowFormat

java.lang.Object

java.lang.Enum<JavaRowFormat>

org.apache.calcite.adapter.enumerable.JavaRowFormat

All Implemented Interfaces:

Serializable, Comparable<JavaRowFormat>

public enum JavaRowFormat
extends Enum<JavaRowFormat>

How a row is represented as a Java value.

Enum Constant Summary

Enum Constants

Enum Constant and Description
ARRAY
CUSTOM
LIST A list that is comparable and immutable.
ROW See Row.
SCALAR

Method Summary

Modifier and Type	Method and Description
@Nullable org.apache.calcite.linq4j.tree.Expression	comparer()
abstract org.apache.calcite.linq4j.tree.Expression	field(org.apache.calcite.linq4j.tree.Expression expression, int field, @Nullable Type fromType, Type fieldType) Returns a reference to a particular field.
JavaRowFormat	optimize(RelDataType rowType)
abstract org.apache.calcite.linq4j.tree.Expression	record(Type javaRowClass, List<org.apache.calcite.linq4j.tree.Expression> expressions)
static JavaRowFormat	valueOf(String name) Returns the enum constant of this type with the specified name.
static JavaRowFormat[]	values() Returns an array containing the constants of this enum type, in the order they are declared.

Methods inherited from class java.lang.Enum

clone, compareTo, equals, finalize, getDeclaringClass, hashCode, name, ordinal, toString, valueOf

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Enum Constant Detail

CUSTOM

public static final JavaRowFormat CUSTOM

SCALAR

public static final JavaRowFormat SCALAR

LIST

public static final JavaRowFormat LIST

A list that is comparable and immutable. Useful for records with 0 fields (empty list is a good singleton) but sometimes also for records with 2 or more fields that you need to be comparable, say as a key in a lookup.

ROW

public static final JavaRowFormat ROW

See Row.

ARRAY

public static final JavaRowFormat ARRAY

Method Detail

values

public static JavaRowFormat[] values()

Returns an array containing the constants of this enum type, in the order they are declared. This method may be used to iterate over the constants as follows:

for (JavaRowFormat c : JavaRowFormat.values())
    System.out.println(c);

Returns:

an array containing the constants of this enum type, in the order they are declared

valueOf

public static JavaRowFormat valueOf(String name)

Returns the enum constant of this type with the specified name. The string must match exactly an identifier used to declare an enum constant in this type. (Extraneous whitespace characters are not permitted.)

Parameters:

name - the name of the enum constant to be returned.

Returns:

the enum constant with the specified name

Throws:

IllegalArgumentException - if this enum type has no constant with the specified name

NullPointerException - if the argument is null

optimize

public JavaRowFormat optimize(RelDataType rowType)

record

public abstract org.apache.calcite.linq4j.tree.Expression record(Type javaRowClass,
                                                                 List<org.apache.calcite.linq4j.tree.Expression> expressions)

comparer

public @Nullable org.apache.calcite.linq4j.tree.Expression comparer()

field

public abstract org.apache.calcite.linq4j.tree.Expression field(org.apache.calcite.linq4j.tree.Expression expression,
                                                                int field,
                                                                @Nullable Type fromType,
                                                                Type fieldType)

Returns a reference to a particular field.

fromType may be null; if null, uses the natural type of the field.