fullstack/hivesterix/hivesterix-common/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";
}