Package org.apache.flink.table.types.inference

Class SystemTypeInference

java.lang.Object

org.apache.flink.table.types.inference.SystemTypeInference

@Internal
public class SystemTypeInference
extends Object

Extends the TypeInference function-aware by additional system columns and validation.

During planning system columns are available and can be accessed in SQL, during runtime those columns are not passed or returned by the eval() method. They are handled with custom code paths.

For example, for ProcessTableFunction, this utility class implicitly adds the optional uid and on_time args and an additional rowtime column in the output. Additionally, it adds a validation layer for complex StaticArguments.

Field Summary

Fields

Modifier and Type	Field	Description
static String	PROCESS_TABLE_FUNCTION_ARG_ON_TIME
static int	PROCESS_TABLE_FUNCTION_ARG_ON_TIME_OFFSET
static String	PROCESS_TABLE_FUNCTION_ARG_UID
static int	PROCESS_TABLE_FUNCTION_ARG_UID_OFFSET
static String	PROCESS_TABLE_FUNCTION_RESULT_ROWTIME
static List<StaticArgument>	PROCESS_TABLE_FUNCTION_SYSTEM_ARGS

Constructor Summary

Constructors

Constructor	Description
SystemTypeInference()

Method Summary

Modifier and Type	Method	Description
static boolean	isInvalidUidForProcessTableFunction(String uid)
static TypeInference	of(FunctionKind functionKind, TypeInference origin)

Methods inherited from class java.lang.Object

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

Field Detail

PROCESS_TABLE_FUNCTION_ARG_UID_OFFSET

public static final int PROCESS_TABLE_FUNCTION_ARG_UID_OFFSET

See Also:

Constant Field Values

PROCESS_TABLE_FUNCTION_ARG_UID

public static final String PROCESS_TABLE_FUNCTION_ARG_UID

See Also:

Constant Field Values

PROCESS_TABLE_FUNCTION_ARG_ON_TIME_OFFSET

public static final int PROCESS_TABLE_FUNCTION_ARG_ON_TIME_OFFSET

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Constant Field Values

PROCESS_TABLE_FUNCTION_ARG_ON_TIME

public static final String PROCESS_TABLE_FUNCTION_ARG_ON_TIME

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Constant Field Values

PROCESS_TABLE_FUNCTION_SYSTEM_ARGS

public static final List<StaticArgument> PROCESS_TABLE_FUNCTION_SYSTEM_ARGS

PROCESS_TABLE_FUNCTION_RESULT_ROWTIME

public static final String PROCESS_TABLE_FUNCTION_RESULT_ROWTIME

See Also:

Constant Field Values

Constructor Detail

SystemTypeInference

public SystemTypeInference()

Method Detail

of

public static TypeInference of(FunctionKind functionKind,
                               TypeInference origin)

isInvalidUidForProcessTableFunction

public static boolean isInvalidUidForProcessTableFunction(String uid)