org.apache.calcite.schema

Interface Function

All Known Subinterfaces:

AggregateFunction, ImplementableAggFunction, ImplementableFunction, ScalarFunction, TableFunction, TableMacro

All Known Implementing Classes:

AggregateFunctionImpl, MaterializedViewTable.MaterializedViewTableMacro, ReflectiveFunctionBase, ScalarFunctionImpl, SqlAdvisorGetHintsFunction, TableFunctionImpl, TableMacroImpl

public interface Function

Named expression that accepts parameters and returns a result.

The application may occur at compile time (for a macro) or at run time (for a regular function). The result may be a relation, and so might any of the parameters.

Functions are registered in a Schema, and may be queried by name (Schema.getFunctions(String)) then overloads resolved based on parameter types.

See Also:

TableMacro, ScalarFunction

Method Summary

Methods

Modifier and Type	Method and Description
List<FunctionParameter>	getParameters() Returns the parameters of this function.

Method Detail

getParameters

List<FunctionParameter> getParameters()

Returns the parameters of this function.

Returns:

Parameters; never null