/**
* Declares a variable, and binds it lazily, so it only gets initialized if it is actually used.
*
* @return the Variable so declared
*/
public Variable bind(
RelNode rel, StatementList statementList, final VariableInitializer initializer) {
VariableInitializerThunk thunk =
new VariableInitializerThunk() {
public VariableInitializer getInitializer() {
return initializer;
}
};
Variable variable = newVariable();
LazyBind bind =
new LazyBind(variable, statementList, getTypeFactory(), rel.getRowType(), thunk);
bind(rel, bind);
return bind.getVariable();
}
