org.apache.calcite.sql.validate

Class AliasNamespace

java.lang.Object

org.apache.calcite.sql.validate.AbstractNamespace

org.apache.calcite.sql.validate.AliasNamespace

All Implemented Interfaces:

SqlValidatorNamespace

public class AliasNamespace
extends AbstractNamespace

Namespace for an AS t(c1, c2, ...) clause.

A namespace is necessary only if there is a column list, in order to re-map column names; a relation AS t clause just uses the same namespace as relation.

Field Summary

Fields

Modifier and Type	Field and Description
protected SqlCall	call

Fields inherited from class org.apache.calcite.sql.validate.AbstractNamespace

enclosingNode, rowType, type, validator

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	AliasNamespace(SqlValidatorImpl validator, SqlCall call, SqlNode enclosingNode) Creates an AliasNamespace.

Method Summary

Modifier and Type	Method and Description
SqlNode	getNode() Returns the parse tree node at the root of this namespace.
private String	getString(RelDataType rowType)
String	translate(String name)
protected RelDataType	validateImpl(RelDataType targetRowType) Validates this scope and returns the type of the records it returns.

Methods inherited from class org.apache.calcite.sql.validate.AbstractNamespace

convertToStruct, fieldExists, getEnclosingNode, getMonotonicExprs, getMonotonicity, getRowType, getRowTypeSansSystemColumns, getTable, getType, getValidator, isWrapperFor, lookupChild, makeNullable, resolve, setType, supportsModality, toStruct, unwrap, validate

Methods inherited from class java.lang.Object

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

Field Detail

call

protected final SqlCall call

Constructor Detail

AliasNamespace

protected AliasNamespace(SqlValidatorImpl validator,
                         SqlCall call,
                         SqlNode enclosingNode)

Creates an AliasNamespace.

Parameters:

validator - Validator

call - Call to AS operator

enclosingNode - Enclosing node

Method Detail

validateImpl

protected RelDataType validateImpl(RelDataType targetRowType)

Description copied from class: AbstractNamespace

Validates this scope and returns the type of the records it returns. External users should call AbstractNamespace.validate(org.apache.calcite.rel.type.RelDataType), which uses the AbstractNamespace.status field to protect against cycles.

Specified by:

validateImpl in class AbstractNamespace

Parameters:

targetRowType - Desired row type, must not be null, may be the data type 'unknown'.

Returns:

record data type, never null

getString

private String getString(RelDataType rowType)

getNode

public SqlNode getNode()

Description copied from interface: SqlValidatorNamespace

Returns the parse tree node at the root of this namespace.

Returns:

parse tree node; null for TableNamespace

translate

public String translate(String name)

Overrides:

translate in class AbstractNamespace