Package org.apache.flink.table.functions

Interface SpecializedFunction.ExpressionEvaluatorFactory

All Known Subinterfaces:

SpecializedFunction.SpecializedContext

Enclosing interface:

SpecializedFunction

@PublicEvolving
public static interface SpecializedFunction.ExpressionEvaluatorFactory

Helper interface for creating SpecializedFunction.ExpressionEvaluators.

Method Summary

Modifier and Type	Method	Description
SpecializedFunction.ExpressionEvaluator	createEvaluator(String sqlExpression, DataType outputDataType, DataTypes.Field... args)	Shorthand for createEvaluator(callSql("..."), ...).
SpecializedFunction.ExpressionEvaluator	createEvaluator(Expression expression, DataType outputDataType, DataTypes.Field... args)	Creates a serializable factory that can be passed into a UserDefinedFunction for evaluating an Expression during runtime.
SpecializedFunction.ExpressionEvaluator	createEvaluator(BuiltInFunctionDefinition function, DataType outputDataType, DataType... args)	Creates a serializable factory that can be passed into a UserDefinedFunction for evaluating a BuiltInFunctionDefinition during runtime.

Method Detail

createEvaluator

SpecializedFunction.ExpressionEvaluator createEvaluator(Expression expression,
                                                        DataType outputDataType,
                                                        DataTypes.Field... args)

Creates a serializable factory that can be passed into a UserDefinedFunction for evaluating an Expression during runtime.

Add a dependency to the flink-table-api-java module to access all available expressions of Table API.

Initialize the evaluator in UserDefinedFunction.open(FunctionContext) by calling SpecializedFunction.ExpressionEvaluator.open(FunctionContext). It will return an invokable instance to be called during runtime.

createEvaluator

SpecializedFunction.ExpressionEvaluator createEvaluator(String sqlExpression,
                                                        DataType outputDataType,
                                                        DataTypes.Field... args)

Shorthand for createEvaluator(callSql("..."), ...).

See Also:

createEvaluator(String, DataType, DataTypes.Field...)

createEvaluator

SpecializedFunction.ExpressionEvaluator createEvaluator(BuiltInFunctionDefinition function,
                                                        DataType outputDataType,
                                                        DataType... args)

Creates a serializable factory that can be passed into a UserDefinedFunction for evaluating a BuiltInFunctionDefinition during runtime.

This method enables to call basic functions without a dependency to the API modules. See BuiltInFunctionDefinitions for a list available functions.

Initialize the evaluator in UserDefinedFunction.open(FunctionContext) by calling SpecializedFunction.ExpressionEvaluator.open(FunctionContext). It will return an invokable instance to be called during runtime.