org.apache.flink.table.types.logical

类 YearMonthIntervalType

java.lang.Object

org.apache.flink.table.types.logical.LogicalType

org.apache.flink.table.types.logical.YearMonthIntervalType

所有已实现的接口:

Serializable

@PublicEvolving
public final class YearMonthIntervalType
extends LogicalType

Logical type for a group of year-month interval types. The type must be parameterized to one of the following resolutions: interval of years, interval of years to months, or interval of months.

An interval of year-month consists of +years-months with values ranging from -9999-11 to +9999-11. The value representation is the same for all types of resolutions. For example, an interval of months of 50 is always represented in an interval-of-years-to-months format (with default year precision): +04-02.

The serialized string representation is INTERVAL YEAR(p), INTERVAL YEAR(p) TO MONTH, or INTERVAL MONTH where p is the number of digits of years (=year precision). p must have a value between 1 and 4 (both inclusive). If no year precision is specified, p is equal to 2.

A conversion from and to int describes the number of months. A conversion from Period ignores the days part.

另请参阅:

DayTimeIntervalType, 序列化表格

嵌套类概要

嵌套类

限定符和类型	类和说明
static class	YearMonthIntervalType.YearMonthResolution Supported resolutions of this type.

字段概要

字段

限定符和类型	字段和说明
static int	DEFAULT_PRECISION
static int	MAX_PRECISION
static int	MIN_PRECISION

构造器概要

构造器

构造器和说明
YearMonthIntervalType(boolean isNullable, YearMonthIntervalType.YearMonthResolution resolution, int yearPrecision)
YearMonthIntervalType(YearMonthIntervalType.YearMonthResolution resolution)
YearMonthIntervalType(YearMonthIntervalType.YearMonthResolution resolution, int yearPrecision)

方法概要

限定符和类型	方法和说明
<R> R	accept(LogicalTypeVisitor<R> visitor)
String	asSerializableString() Returns a string that fully serializes this instance.
LogicalType	copy(boolean isNullable) Returns a deep copy of this type with possibly different nullability.
boolean	equals(Object o)
List<LogicalType>	getChildren()
Class<?>	getDefaultConversion() Returns the default conversion class.
YearMonthIntervalType.YearMonthResolution	getResolution()
int	getYearPrecision()
int	hashCode()
boolean	supportsInputConversion(Class<?> clazz) Returns whether an instance of the given class can be represented as a value of this logical type when entering the table ecosystem.
boolean	supportsOutputConversion(Class<?> clazz) Returns whether a value of this logical type can be represented as an instance of the given class when leaving the table ecosystem.

从类继承的方法 org.apache.flink.table.types.logical.LogicalType

asSummaryString, conversionSet, copy, getTypeRoot, isNullable, toString, withNullability

从类继承的方法 java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

字段详细资料

MIN_PRECISION

public static final int MIN_PRECISION

另请参阅:

常量字段值

MAX_PRECISION

public static final int MAX_PRECISION

另请参阅:

常量字段值

DEFAULT_PRECISION

public static final int DEFAULT_PRECISION

另请参阅:

常量字段值

构造器详细资料

YearMonthIntervalType

public YearMonthIntervalType(boolean isNullable,
                             YearMonthIntervalType.YearMonthResolution resolution,
                             int yearPrecision)

YearMonthIntervalType

public YearMonthIntervalType(YearMonthIntervalType.YearMonthResolution resolution,
                             int yearPrecision)

YearMonthIntervalType

public YearMonthIntervalType(YearMonthIntervalType.YearMonthResolution resolution)

方法详细资料

getResolution

public YearMonthIntervalType.YearMonthResolution getResolution()

getYearPrecision

public int getYearPrecision()

copy

public LogicalType copy(boolean isNullable)

从类复制的说明: LogicalType

Returns a deep copy of this type with possibly different nullability.

指定者:

copy 在类中 LogicalType

参数:

isNullable - the intended nullability of the copied type

返回:

a deep copy

asSerializableString

public String asSerializableString()

从类复制的说明: LogicalType

Returns a string that fully serializes this instance. The serialized string can be used for transmitting or persisting a type.

See LogicalTypeParser for the reverse operation.

指定者:

asSerializableString 在类中 LogicalType

返回:

detailed string for transmission or persistence

supportsInputConversion

public boolean supportsInputConversion(Class<?> clazz)

从类复制的说明: LogicalType

Returns whether an instance of the given class can be represented as a value of this logical type when entering the table ecosystem. This method helps for the interoperability between JVM-based languages and the relational type system.

A supported conversion directly maps an input class to a logical type without loss of precision or type widening.

For example, java.lang.Long or long can be used as input for BIGINT independent of the set nullability.

指定者:

supportsInputConversion 在类中 LogicalType

参数:

clazz - input class to be converted into this logical type

返回:

flag that indicates if instances of this class can be used as input into the table ecosystem

另请参阅:

LogicalType.getDefaultConversion()

supportsOutputConversion

public boolean supportsOutputConversion(Class<?> clazz)

从类复制的说明: LogicalType

Returns whether a value of this logical type can be represented as an instance of the given class when leaving the table ecosystem. This method helps for the interoperability between JVM-based languages and the relational type system.

A supported conversion directly maps a logical type to an output class without loss of precision or type widening.

For example, java.lang.Long or long can be used as output for BIGINT if the type is not nullable. If the type is nullable, only java.lang.Long can represent this.

指定者:

supportsOutputConversion 在类中 LogicalType

参数:

clazz - output class to be converted from this logical type

返回:

flag that indicates if instances of this class can be used as output from the table ecosystem

另请参阅:

LogicalType.getDefaultConversion()

getDefaultConversion

public Class<?> getDefaultConversion()

从类复制的说明: LogicalType

Returns the default conversion class. A value of this logical type is expected to be an instance of the given class when entering or is represented as an instance of the given class when leaving the table ecosystem if no other conversion has been specified.

For example, java.lang.Long is the default input and output for BIGINT.

指定者:

getDefaultConversion 在类中 LogicalType

返回:

default class to represent values of this logical type

另请参阅:

LogicalType.supportsInputConversion(Class), LogicalType.supportsOutputConversion(Class)

getChildren

public List<LogicalType> getChildren()

指定者:

getChildren 在类中 LogicalType

accept

public <R> R accept(LogicalTypeVisitor<R> visitor)

指定者:

accept 在类中 LogicalType

equals

public boolean equals(Object o)

覆盖:

equals 在类中 LogicalType

hashCode

public int hashCode()

覆盖:

hashCode 在类中 LogicalType