org.eigenbase.sql.validate
Class AggChecker

java.lang.Object
  org.eigenbase.sql.util.SqlBasicVisitor<Void>
      org.eigenbase.sql.validate.AggChecker

All Implemented Interfaces:

SqlVisitor<Void>

 class AggChecker
extends SqlBasicVisitor<Void>

Visitor which throws an exception if any component of the expression is not a group expression.

Since:

Oct 28, 2004

Version:

$Id: //open/dev/farrago/src/org/eigenbase/sql/validate/AggChecker.java#14 $

Author:

jhyde

Nested Class Summary

Nested classes/interfaces inherited from class org.eigenbase.sql.util.SqlBasicVisitor

SqlBasicVisitor.ArgHandler<R>, SqlBasicVisitor.ArgHandlerImpl<R>

Field Summary

private boolean	distinct
private List<SqlNode>	groupExprs
private Stack<SqlValidatorScope>	scopes
private SqlValidatorImpl	validator

Constructor Summary

AggChecker(SqlValidatorImpl validator, AggregatingScope scope, List<SqlNode> groupExprs, boolean distinct)
Creates an AggChecker.

Method Summary

(package private) boolean	isGroupExpr(SqlNode expr)
Void	visit(SqlCall call) Visits a call to a SqlOperator.
Void	visit(SqlIdentifier id) Visits an identifier.

Methods inherited from class org.eigenbase.sql.util.SqlBasicVisitor

visit, visit, visit, visit, visit

Methods inherited from class java.lang.Object

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

Field Detail

scopes

private final Stack<SqlValidatorScope> scopes

groupExprs

private final List<SqlNode> groupExprs

distinct

private boolean distinct

validator

private SqlValidatorImpl validator

Constructor Detail

AggChecker

AggChecker(SqlValidatorImpl validator,
           AggregatingScope scope,
           List<SqlNode> groupExprs,
           boolean distinct)

Creates an AggChecker.

Parameters:

validator - Validator

scope - Scope

groupExprs - Expressions in GROUP BY (or SELECT DISTINCT) clause, that are therefore available

distinct - Whether aggregation checking is because of a SELECT DISTINCT clause

Method Detail

isGroupExpr

boolean isGroupExpr(SqlNode expr)

visit

public Void visit(SqlIdentifier id)

Description copied from interface: SqlVisitor

Visits an identifier.

Specified by:

visit in interface SqlVisitor<Void>

Overrides:

visit in class SqlBasicVisitor<Void>

Parameters:

id - identifier

See Also:

SqlIdentifier.accept(SqlVisitor)

visit

public Void visit(SqlCall call)

Description copied from interface: SqlVisitor

Visits a call to a SqlOperator.

Specified by:

visit in interface SqlVisitor<Void>

Overrides:

visit in class SqlBasicVisitor<Void>

Parameters:

call - Call

See Also:

SqlCall.accept(SqlVisitor)