org.apache.calcite.sql.type

Class TableFunctionReturnTypeInference

java.lang.Object

org.apache.calcite.sql.type.ExplicitReturnTypeInference

org.apache.calcite.sql.type.TableFunctionReturnTypeInference

All Implemented Interfaces:

SqlReturnTypeInference

public class TableFunctionReturnTypeInference
extends ExplicitReturnTypeInference

TableFunctionReturnTypeInference implements rules for deriving table function output row types by expanding references to cursor parameters.

Field Summary

Fields

Modifier and Type	Field and Description
private Set<RelColumnMapping>	columnMappings
private boolean	isPassthrough
private List<String>	paramNames

Fields inherited from class org.apache.calcite.sql.type.ExplicitReturnTypeInference

protoType

Constructor Summary

Constructors

Constructor and Description
TableFunctionReturnTypeInference(RelProtoDataType unexpandedOutputType, List<String> paramNames, boolean isPassthrough)

Method Summary

Modifier and Type	Method and Description
private void	addOutputColumn(List<String> expandedFieldNames, List<RelDataType> expandedOutputTypes, int iInputColumn, int iCursor, SqlOperatorBinding opBinding, RelDataTypeField cursorField)
Set<RelColumnMapping>	getColumnMappings()
RelDataType	inferReturnType(SqlOperatorBinding opBinding) Infers the return type of a call to an SqlOperator.

Methods inherited from class java.lang.Object

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

Field Detail

paramNames

private final List<String> paramNames

columnMappings

private Set<RelColumnMapping> columnMappings

isPassthrough

private final boolean isPassthrough

Constructor Detail

TableFunctionReturnTypeInference

public TableFunctionReturnTypeInference(RelProtoDataType unexpandedOutputType,
                                        List<String> paramNames,
                                        boolean isPassthrough)

Method Detail

getColumnMappings

public Set<RelColumnMapping> getColumnMappings()

inferReturnType

public RelDataType inferReturnType(SqlOperatorBinding opBinding)

Description copied from interface: SqlReturnTypeInference

Infers the return type of a call to an SqlOperator.

Specified by:

inferReturnType in interface SqlReturnTypeInference

Overrides:

inferReturnType in class ExplicitReturnTypeInference

Parameters:

opBinding - description of operator binding

Returns:

inferred type; may be null

addOutputColumn

private void addOutputColumn(List<String> expandedFieldNames,
                             List<RelDataType> expandedOutputTypes,
                             int iInputColumn,
                             int iCursor,
                             SqlOperatorBinding opBinding,
                             RelDataTypeField cursorField)