org.apache.flink.table.functions

Interface SpecializedFunction.ExpressionEvaluatorFactory

All Known Subinterfaces:

SpecializedFunction.SpecializedContext

Enclosing interface:

SpecializedFunction

public static interface SpecializedFunction.ExpressionEvaluatorFactory

Helper interface for creating SpecializedFunction.ExpressionEvaluators.

Method Summary

Modifier and Type	Method and Description
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.
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(String sqlExpression, DataType outputDataType, DataTypes.Field... args) Shorthand for createEvaluator(callSql("..."), ...).

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.