Package dev.frostlake.executor.operators

Class TableFunctionOperator

java.lang.Object

dev.frostlake.executor.operators.TableFunctionOperator

All Implemented Interfaces:

Operator

public class TableFunctionOperator
extends Object
implements Operator

TABLE FUNCTION operator - executes table-valued functions. This operator handles execution of table functions like GENERATOR, RESULT_SCAN, and other table-valued functions that generate rows. Table functions differ from regular operators as they don't take input rows - they generate rows from scratch based on their arguments.

Constructor Summary

Constructors

Constructor	Description
TableFunctionOperator(String functionName, ResultSetProvider resultProvider)	Create a table function operator with a custom result provider.
TableFunctionOperator(String functionName, TableFunction tableFunction, List<Object> positionalArguments)	Create a table function operator with positional arguments.
TableFunctionOperator(String functionName, TableFunction tableFunction, Map<String,Object> namedArguments)	Create a table function operator with named arguments.

Method Summary

Modifier and Type	Method	Description
List<Row>	execute(List<Row> input, OperatorContext context)	Execute this operator on the input rows.
String	getDescription()	Get a description of this operator for debugging/logging.

Methods inherited from class java.lang.Object

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

Constructor Details

TableFunctionOperator

public TableFunctionOperator(String functionName,
 TableFunction tableFunction,
 Map<String,Object> namedArguments)

Create a table function operator with named arguments.

Parameters:

functionName - Name of the table function

tableFunction - The table function to execute

namedArguments - Named arguments (e.g., ROWCOUNT => 10)

TableFunctionOperator

public TableFunctionOperator(String functionName,
 TableFunction tableFunction,
 List<Object> positionalArguments)

Create a table function operator with positional arguments.

Parameters:

functionName - Name of the table function

tableFunction - The table function to execute

positionalArguments - Positional arguments

TableFunctionOperator

public TableFunctionOperator(String functionName,
 ResultSetProvider resultProvider)

Create a table function operator with a custom result provider. Useful for special cases like RESULT_SCAN with LAST_QUERY_ID().

Parameters:

functionName - Name of the table function

resultProvider - Provider that produces the ResultSet

Method Details

execute

public List<Row> execute(List<Row> input,
 OperatorContext context)

Description copied from interface: Operator

Execute this operator on the input rows.

Specified by:

execute in interface Operator

Parameters:

input - The input rows from the previous operator

context - The execution context containing table metadata and other information

Returns:

The output rows after applying this operator

getDescription

public String getDescription()

Description copied from interface: Operator

Get a description of this operator for debugging/logging.

Specified by:

getDescription in interface Operator

Returns:

A human-readable description of the operator