org.apache.spark.sql.connector.catalog

枚举 TableCatalogCapability

java.lang.Object

java.lang.Enum<TableCatalogCapability>

org.apache.spark.sql.connector.catalog.TableCatalogCapability

所有已实现的接口:

Serializable, Comparable<TableCatalogCapability>

public enum TableCatalogCapability
extends Enum<TableCatalogCapability>

Capabilities that can be provided by a TableCatalog implementation.

枚举常量概要

枚举常量

枚举常量和说明
SUPPORT_COLUMN_DEFAULT_VALUE Signals that the TableCatalog supports defining column default value as expression in CREATE/REPLACE/ALTER TABLE.
SUPPORTS_CREATE_TABLE_WITH_GENERATED_COLUMNS Signals that the TableCatalog supports defining generated columns upon table creation in SQL.

方法概要

限定符和类型	方法和说明
static TableCatalogCapability	valueOf(String name) 返回带有指定名称的该类型的枚举常量。
static TableCatalogCapability[]	values() 按照声明该枚举类型的常量的顺序, 返回 包含这些常量的数组。

从类继承的方法 java.lang.Enum

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

从类继承的方法 java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

枚举常量详细资料

SUPPORTS_CREATE_TABLE_WITH_GENERATED_COLUMNS

public static final TableCatalogCapability SUPPORTS_CREATE_TABLE_WITH_GENERATED_COLUMNS

Signals that the TableCatalog supports defining generated columns upon table creation in SQL.

Without this capability, any create/replace table statements with a generated column defined in the table schema will throw an exception during analysis.

A generated column is defined with syntax: colName colType GENERATED ALWAYS AS (expr)

Generation expression are included in the column definition for APIs like TableCatalog.createTable(org.apache.spark.sql.connector.catalog.Identifier, org.apache.spark.sql.types.StructType, org.apache.spark.sql.connector.expressions.Transform[], java.util.Map<java.lang.String, java.lang.String>).

SUPPORT_COLUMN_DEFAULT_VALUE

public static final TableCatalogCapability SUPPORT_COLUMN_DEFAULT_VALUE

Signals that the TableCatalog supports defining column default value as expression in CREATE/REPLACE/ALTER TABLE.

Without this capability, any CREATE/REPLACE/ALTER TABLE statement with a column default value defined in the table schema will throw an exception during analysis.

A column default value is defined with syntax: colName colType DEFAULT expr

Column default value expression is included in the column definition for APIs like TableCatalog.createTable(org.apache.spark.sql.connector.catalog.Identifier, org.apache.spark.sql.types.StructType, org.apache.spark.sql.connector.expressions.Transform[], java.util.Map<java.lang.String, java.lang.String>).

方法详细资料

values

public static TableCatalogCapability[] values()

按照声明该枚举类型的常量的顺序, 返回 包含这些常量的数组。该方法可用于迭代 常量, 如下所示:

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

返回:

按照声明该枚举类型的常量的顺序返回的包含这些常量的数组

valueOf

public static TableCatalogCapability valueOf(String name)

返回带有指定名称的该类型的枚举常量。 字符串必须与用于声明该类型的枚举常量的 标识符完全匹配。(不允许有多余 的空格字符。)

参数:

name - 要返回的枚举常量的名称。

返回:

返回带有指定名称的枚举常量

抛出:

IllegalArgumentException - 如果该枚举类型没有带有指定名称的常量

NullPointerException - 如果参数为空值