修复EL表达式支持数字以外的变量，并且修复=,!=判断的bug

src/main/java/com/quantgroup/asset/distribution/util/calc/Expression.java

@@ -26,8 +26,6 @@ package com.quantgroup.asset.distribution.util.calc;
  * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  *
  */
-import com.google.common.collect.Sets;
-
 import lombok.Getter;
 import lombok.Setter;
 
@@ -674,8 +672,13 @@ public class Expression {
                 if (v1 == null || v2 == null) {
                     return BigDecimal.ZERO;
                 }
-                return new BigDecimal(v1).compareTo(new BigDecimal(v2)) == 0 ? BigDecimal.ONE
-                        : BigDecimal.ZERO;
+                if (v1.equals(v2)) {
+                	return BigDecimal.ONE;
+                } else {
+                	return BigDecimal.ZERO;
+                }
+//                return new BigDecimal(v1).compareTo(new BigDecimal(v2)) == 0 ? BigDecimal.ONE
+//                        : BigDecimal.ZERO;
             }
         });
         addOperator(new Operator("==", OPERATOR_PRECEDENCE_EQUALITY, false, true) {
@@ -694,8 +697,11 @@ public class Expression {
                 if (v1 == null || v2 == null) {
                     return BigDecimal.ONE;
                 }
-                return new BigDecimal(v1).compareTo(new BigDecimal(v2)) != 0 ? BigDecimal.ONE
-                        : BigDecimal.ZERO;
+                if (!v1.equals(v2)) {
+                	return BigDecimal.ONE;
+                } else {
+                	return BigDecimal.ZERO;
+                }
             }
         });
         addOperator(new Operator("<>", OPERATOR_PRECEDENCE_EQUALITY, false, true) {
@@ -1400,7 +1406,8 @@ public class Expression {
                     stack.push(() -> {
                         LazyNumber lazyVariable = variables.get(token.surface);
                         String value = lazyVariable == null ? null : lazyVariable.eval();
-                        return value == null ? null : new BigDecimal(value).round(mc).toPlainString();
+//                        return value == null ? null : new BigDecimal(value).round(mc).toPlainString();
+                        return value == null ? null : value;
                     });
                     break;
                 case FUNCTION:
@@ -1570,7 +1577,10 @@ public class Expression {
             variables.put(variable, CreateLazyNumber(new BigDecimal(value, mc).toPlainString()));
         } else if (value.equalsIgnoreCase("null")) {
             variables.put(variable, null);
-        } else {
+        } else if (value.equalsIgnoreCase("e") || 
+        		   value.equalsIgnoreCase("PI") ||
+        		   value.equalsIgnoreCase("TRUE")||
+        		   value.equalsIgnoreCase("FALSE")) {
 	        final String expStr = value;
 	        variables.put(variable, new LazyNumber() {
 	            private final Map<String, LazyNumber> outerVariables = variables;
@@ -1591,6 +1601,9 @@ public class Expression {
 	            }
 	        });
 	        rpn = null;
+        } else {
+        	variables.put(variable,  CreateLazyNumber(value));
+            rpn = null;
         }
         return this;
     }