org.eigenbase.sql.validate
Class OverScope

java.lang.Object
  org.eigenbase.sql.validate.DelegatingScope
      org.eigenbase.sql.validate.ListScope
          org.eigenbase.sql.validate.OverScope

All Implemented Interfaces:

SqlValidatorScope

public class OverScope
extends ListScope

The name-resolution scope of a OVER clause. The objects visible are those in the parameters found on the left side of the over clause, and objects inherited from the parent scope.

This object is both a SqlValidatorScope only. In the query

SELECT name FROM (
     SELECT *
     FROM emp OVER (
         ORDER BY empno
         RANGE BETWEEN 2 PRECEDING AND 2 FOLLOWING))
 

We need to use the OverScope as a SqlValidatorNamespace when resolving names used in the window specification.

Since:

Jun 29, 2005

Version:

$Id: //open/dev/farrago/src/org/eigenbase/sql/validate/OverScope.java#10 $

Author:

jack

Field Summary

private SqlCall

overCall

Fields inherited from class org.eigenbase.sql.validate.ListScope

children, childrenNames

Fields inherited from class org.eigenbase.sql.validate.DelegatingScope

parent, validator

Constructor Summary

OverScope(SqlValidatorScope parent, SqlCall overCall)
Creates a scope corresponding to a SELECT clause.

Method Summary

SqlMonotonicity	getMonotonicity(SqlNode expr) Returns whether an expression is monotonic in this scope.
SqlNode	getNode() Returns the root node of this scope.

Methods inherited from class org.eigenbase.sql.validate.ListScope

addChild, findAliases, findAllColumnNames, findQualifyingTableName, getChild, getChildren, resolve, resolveColumn

Methods inherited from class org.eigenbase.sql.validate.DelegatingScope

addColumnNames, fullyQualify, getOperandScope, getOrderList, getParent, getValidator, lookupWindow, validateExpr

Methods inherited from class java.lang.Object

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

Field Detail

overCall

private final SqlCall overCall

Constructor Detail

OverScope

OverScope(SqlValidatorScope parent,
          SqlCall overCall)

Creates a scope corresponding to a SELECT clause.

Parameters:

parent - Parent scope, or null

overCall - Call to OVER operator

Method Detail

getNode

public SqlNode getNode()

Description copied from interface: SqlValidatorScope

Returns the root node of this scope.

getMonotonicity

public SqlMonotonicity getMonotonicity(SqlNode expr)

Description copied from interface: SqlValidatorScope

Returns whether an expression is monotonic in this scope. For example, if the scope has previously been sorted by columns X, Y, then X is monotonic in this scope, but Y is not.

Specified by:

getMonotonicity in interface SqlValidatorScope

Overrides:

getMonotonicity in class DelegatingScope