?? intersect.java
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package executionengine;import compiler.Attribute;import recordmanagement.Schema;import recordmanagement.Tuple;/** *集合、包交 * */public class Intersect implements Operation { /** *@see executionengine.Operation#open() * */ public void open() { } /** *@see executionengine.Operation#hasNext() * */ public boolean hasNext() { return false; } /** *@see executionengine.Operation#getNext() * */ public Tuple getNext() { return null; } /** *@see executionengine.Operation#close() * */ public void close() { } /* (non-Javadoc) * @see executionengine.Operation#getSchema() */ public Schema getSchema() { // TODO Auto-generated method stub return null; } /* (non-Javadoc) * @see executionengine.Operation#getAttributeList() */ public Attribute[] getAttributeList() { // TODO Auto-generated method stub return null; } } ?? 快捷鍵說明
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