hivesterix/src/main/java/edu/uci/ics/hivesterix/logical/expression/ExpressionConstant.java

package edu.uci.ics.hivesterix.logical.expression;

/**
 * some constants for expression
 * 
 * @author yingyib
 * 
 */
public class ExpressionConstant {

	/**
	 * name space for function identifier
	 */
	public static String NAMESPACE = "hive";

	/**
	 * field expression: modeled as function in Algebricks
	 */
	public static String FIELDACCESS = "fieldaccess";

	/**
	 * null string: modeled as null in Algebricks
	 */
	public static String NULL = "null";
}