程序包 org.apache.flink.ml.feature.sqltransformer

类 SQLTransformer

java.lang.Object

org.apache.flink.ml.feature.sqltransformer.SQLTransformer

所有已实现的接口:

Serializable, org.apache.flink.ml.api.AlgoOperator<SQLTransformer>, org.apache.flink.ml.api.Stage<SQLTransformer>, org.apache.flink.ml.api.Transformer<SQLTransformer>, SQLTransformerParams<SQLTransformer>, org.apache.flink.ml.param.WithParams<SQLTransformer>

public class SQLTransformer
extends Object
implements org.apache.flink.ml.api.Transformer<SQLTransformer>, SQLTransformerParams<SQLTransformer>

SQLTransformer implements the transformations that are defined by SQL statement.

Currently we only support SQL syntax like `SELECT ... FROM __THIS__ ...` where `__THIS__` represents the input table and cannot be modified.

The select clause specifies the fields, constants, and expressions to display in the output. Except the cases described in the note section below, it can be any select clause that Flink SQL supports. Users can also use Flink SQL built-in function and UDFs to operate on these selected columns.

For example, SQLTransformer supports statements like:

• `SELECT a, a + b AS a_b FROM __THIS__`
• `SELECT a, SQRT(b) AS b_sqrt FROM __THIS__ where a > 5`
• `SELECT a, b, SUM(c) AS c_sum FROM __THIS__ GROUP BY a, b`

Note: This operator only generates append-only/insert-only table as its output. If the output table could possibly contain retract messages(e.g. perform `SELECT ... FROM __THIS__ GROUP BY ...` operation on a table in streaming mode), this operator would aggregate all changelogs and only output the final state.

另请参阅:

序列化表格

嵌套类概要

从接口继承的嵌套类/接口 org.apache.flink.ml.feature.sqltransformer.SQLTransformerParams

SQLTransformerParams.SQLStatementValidator

字段概要

从接口继承的字段 org.apache.flink.ml.feature.sqltransformer.SQLTransformerParams

STATEMENT

构造器概要

构造器

构造器	说明
SQLTransformer()

方法概要

修饰符和类型	方法	说明
Map<org.apache.flink.ml.param.Param<?>,Object>	getParamMap()
static SQLTransformer	load(org.apache.flink.table.api.bridge.java.StreamTableEnvironment tEnv, String path)
void	save(String path)
org.apache.flink.table.api.Table[]	transform(org.apache.flink.table.api.Table... inputs)

从类继承的方法 java.lang.Object

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

从接口继承的方法 org.apache.flink.ml.feature.sqltransformer.SQLTransformerParams

getStatement, setStatement

从接口继承的方法 org.apache.flink.ml.param.WithParams

get, getParam, set

构造器详细资料

SQLTransformer

public SQLTransformer()

方法详细资料

transform

public org.apache.flink.table.api.Table[] transform(org.apache.flink.table.api.Table... inputs)

指定者:

transform 在接口中 org.apache.flink.ml.api.AlgoOperator<SQLTransformer>

save

public void save(String path)
          throws IOException

指定者:

save 在接口中 org.apache.flink.ml.api.Stage<SQLTransformer>

抛出:

IOException

load

public static SQLTransformer load(org.apache.flink.table.api.bridge.java.StreamTableEnvironment tEnv,
                                  String path)
                           throws IOException

抛出:

IOException

getParamMap

public Map<org.apache.flink.ml.param.Param<?>,Object> getParamMap()

指定者:

getParamMap 在接口中 org.apache.flink.ml.param.WithParams<SQLTransformer>