org.apache.calcite.sql.validate

Class JoinScope

java.lang.Object

org.apache.calcite.sql.validate.DelegatingScope

org.apache.calcite.sql.validate.ListScope

org.apache.calcite.sql.validate.JoinScope

All Implemented Interfaces:

SqlValidatorScope

public class JoinScope
extends ListScope

The name-resolution context for expression inside a JOIN clause. The objects visible are the joined table expressions, and those inherited from the parent scope.

Consider "SELECT * FROM (A JOIN B ON {exp1}) JOIN C ON {exp2}". {exp1} is resolved in the join scope for "A JOIN B", which contains A and B but not C.

Nested Class Summary

Nested classes/interfaces inherited from interface org.apache.calcite.sql.validate.SqlValidatorScope

SqlValidatorScope.EmptyPath, SqlValidatorScope.Path, SqlValidatorScope.Resolve, SqlValidatorScope.Resolved, SqlValidatorScope.ResolvedImpl, SqlValidatorScope.Step

Field Summary

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

children

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

parent, validator

Method Summary

Modifier and Type	Method and Description
void	addChild(SqlValidatorNamespace ns, String alias, boolean nullable) Registers a relation in this scope.
SqlNode	getNode() Returns the root node of this scope.
@Nullable SqlValidatorScope	getUsingScope() Returns the scope which is used for resolving USING clause.
boolean	isWithin(@Nullable SqlValidatorScope scope2) Returns whether this scope is enclosed within scope2 in such a way that it can see the contents of scope2.
@Nullable SqlWindow	lookupWindow(String name) Finds a window with a given name.

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

findAliases, findAllColumnNames, findQualifyingTableName, findQualifyingTableNames, getChildren, isChildNullable, resolve, resolveColumn

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

addColumnNames, fullyQualify, getMonotonicity, getOperandScope, getOrderList, getParent, getTableNamespace, getValidator, nullifyType, resolveTable, validateExpr

Methods inherited from class java.lang.Object

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

Method Detail

getNode

public SqlNode getNode()

Description copied from interface: SqlValidatorScope

Returns the root node of this scope. Never null.

addChild

public void addChild(SqlValidatorNamespace ns,
                     String alias,
                     boolean nullable)

Description copied from interface: SqlValidatorScope

Registers a relation in this scope.

Specified by:

addChild in interface SqlValidatorScope

Overrides:

addChild in class ListScope

Parameters:

ns - Namespace representing the result-columns of the relation

alias - Alias with which to reference the relation, must not be null

nullable - Whether this is a null-generating side of a join

lookupWindow

public @Nullable SqlWindow lookupWindow(String name)

Description copied from interface: SqlValidatorScope

Finds a window with a given name. Returns null if not found.

Specified by:

lookupWindow in interface SqlValidatorScope

Overrides:

lookupWindow in class DelegatingScope

getUsingScope

public @Nullable SqlValidatorScope getUsingScope()

Returns the scope which is used for resolving USING clause.

isWithin

public boolean isWithin(@Nullable SqlValidatorScope scope2)

Description copied from interface: SqlValidatorScope

Returns whether this scope is enclosed within scope2 in such a way that it can see the contents of scope2.