optimization tests + query builder

src/main/java/jef/expressions/AndExpression.java

@@ -1,13 +1,16 @@
 package jef.expressions;
 
 import lombok.AllArgsConstructor;
+import lombok.EqualsAndHashCode;
 import lombok.Getter;
 
 import java.util.List;
+import java.util.Objects;
 import java.util.stream.Collectors;
 
 @Getter
 @AllArgsConstructor
+@EqualsAndHashCode
 public class AndExpression implements Expression {
     private final List<Expression> exprs;
 
@@ -25,6 +28,19 @@ public class AndExpression implements Expression {
         return Priority.LOGIC_AND;
     }
 
+//    @Override
+//    public boolean equals(Object o) {
+//        if (this == o) return true;
+//        if (o == null || getClass() != o.getClass()) return false;
+//        AndExpression that = (AndExpression) o;
+//        return exprs.equals(that.exprs);
+//    }
+//
+//    @Override
+//    public int hashCode() {
+//        return Objects.hash(exprs);
+//    }
+
     @Override
     public String toString() {
         return exprs.stream().map(e -> {