gudusoft.gsqlparser.resolver2.scope

Class GroupByScope

Object

gudusoft.gsqlparser.resolver2.scope.AbstractScope

gudusoft.gsqlparser.resolver2.scope.GroupByScope

All Implemented Interfaces:

IScope

public class GroupByScope
extends AbstractScope

Scope for GROUP BY clause.

Visibility rules: - Can access columns from FROM scope - Cannot access aggregate functions or SELECT list aliases - In some databases (MySQL), can access SELECT list columns

Example:

 SELECT department, COUNT(*) as emp_count
 FROM employees
 GROUP BY department  -- Can reference employees.department
 

The GROUP BY scope delegates column resolution to its parent (typically a SelectScope), which has access to the FROM scope.

Field Summary

Fields inherited from class gudusoft.gsqlparser.resolver2.scope.AbstractScope

node, parent, scopeType

Constructor Summary

Constructors

Constructor and Description
GroupByScope(IScope parent, TGroupBy groupByNode)

Method Summary

Modifier and Type	Method and Description
IScope	getFromScope() Get the FROM scope.
TGroupBy	getGroupByNode()
void	setFromScope(IScope fromScope) Set the FROM scope for column resolution.
String	toString()

Methods inherited from class gudusoft.gsqlparser.resolver2.scope.AbstractScope

addChild, fullyQualify, getChildren, getNode, getParent, getScopeType, getVisibleNamespaces, isWithin, resolve, resolveTable

Methods inherited from class Object

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

Constructor Detail

GroupByScope

public GroupByScope(IScope parent,
                    TGroupBy groupByNode)

Method Detail

setFromScope

public void setFromScope(IScope fromScope)

Set the FROM scope for column resolution. GROUP BY columns should resolve against FROM scope tables.

Parameters:

fromScope - the FROM scope

getFromScope

public IScope getFromScope()

Get the FROM scope.

Returns:

the FROM scope, or null if not set

getGroupByNode

public TGroupBy getGroupByNode()

toString

public String toString()

Overrides:

toString in class AbstractScope