feat: syntax sugar

Signed-off-by: Andreas Reichel <andreas@manticore-projects.com>

Author: manticore-projects

src/main/java/net/sf/jsqlparser/expression/operators/relational/IsNullExpression.java

@@ -12,6 +12,7 @@
 import net.sf.jsqlparser.expression.Expression;
 import net.sf.jsqlparser.expression.ExpressionVisitor;
 import net.sf.jsqlparser.parser.ASTNodeAccessImpl;
+import net.sf.jsqlparser.schema.Column;
 
 public class IsNullExpression extends ASTNodeAccessImpl implements Expression {
 
@@ -26,6 +27,11 @@ public IsNullExpression(Expression leftExpression) {
         this.leftExpression = leftExpression;
     }
 
+    public IsNullExpression(String columnName, boolean useNotNull) {
+        this.leftExpression = new Column(columnName);
+        this.useNotNull = useNotNull;
+    }
+
     public Expression getLeftExpression() {
         return leftExpression;
     }