diff --git a/internal/compiler/output_columns.go b/internal/compiler/output_columns.go
index 19128f71ae..e31a4eea9b 100644
--- a/internal/compiler/output_columns.go
+++ b/internal/compiler/output_columns.go
@@ -173,12 +173,17 @@ func (c *Compiler) outputColumns(qc *QueryCatalog, node ast.Node) ([]*Column, er
 				name = *res.Name
 			}
 			notNull := false
-			if n.Boolop == ast.BoolExprTypeNot && len(n.Args.Items) == 1 {
-				sublink, ok := n.Args.Items[0].(*ast.SubLink)
-				if ok && sublink.SubLinkType == ast.EXISTS_SUBLINK {
+			if len(n.Args.Items) == 1 {
+				switch n.Boolop {
+				case ast.BoolExprTypeIsNull, ast.BoolExprTypeIsNotNull:
 					notNull = true
-					if name == "" {
-						name = "not_exists"
+				case ast.BoolExprTypeNot:
+					sublink, ok := n.Args.Items[0].(*ast.SubLink)
+					if ok && sublink.SubLinkType == ast.EXISTS_SUBLINK {
+						notNull = true
+						if name == "" {
+							name = "not_exists"
+						}
 					}
 				}
 			}
diff --git a/internal/endtoend/testdata/comparisons/mysql/go/query.sql.go b/internal/endtoend/testdata/comparisons/mysql/go/query.sql.go
index cd77cc1b42..b823f5f383 100644
--- a/internal/endtoend/testdata/comparisons/mysql/go/query.sql.go
+++ b/internal/endtoend/testdata/comparisons/mysql/go/query.sql.go
@@ -117,6 +117,60 @@ func (q *Queries) GreaterThanOrEqual(ctx context.Context) ([]bool, error) {
 	return items, nil
 }
 
+const isNotNull = `-- name: IsNotNull :many
+SELECT id IS NOT NULL FROM bar
+`
+
+func (q *Queries) IsNotNull(ctx context.Context) ([]bool, error) {
+	rows, err := q.db.QueryContext(ctx, isNotNull)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+	var items []bool
+	for rows.Next() {
+		var column_1 bool
+		if err := rows.Scan(&column_1); err != nil {
+			return nil, err
+		}
+		items = append(items, column_1)
+	}
+	if err := rows.Close(); err != nil {
+		return nil, err
+	}
+	if err := rows.Err(); err != nil {
+		return nil, err
+	}
+	return items, nil
+}
+
+const isNull = `-- name: IsNull :many
+SELECT id IS NULL FROM bar
+`
+
+func (q *Queries) IsNull(ctx context.Context) ([]bool, error) {
+	rows, err := q.db.QueryContext(ctx, isNull)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+	var items []bool
+	for rows.Next() {
+		var column_1 bool
+		if err := rows.Scan(&column_1); err != nil {
+			return nil, err
+		}
+		items = append(items, column_1)
+	}
+	if err := rows.Close(); err != nil {
+		return nil, err
+	}
+	if err := rows.Err(); err != nil {
+		return nil, err
+	}
+	return items, nil
+}
+
 const lessThan = `-- name: LessThan :many
 SELECT count(*) < 0 FROM bar
 `
diff --git a/internal/endtoend/testdata/comparisons/mysql/query.sql b/internal/endtoend/testdata/comparisons/mysql/query.sql
index 3c609f4660..73714ec749 100644
--- a/internal/endtoend/testdata/comparisons/mysql/query.sql
+++ b/internal/endtoend/testdata/comparisons/mysql/query.sql
@@ -24,8 +24,8 @@ SELECT count(*) <> 0 FROM bar;
 -- name: Equal :many
 SELECT count(*) = 0 FROM bar;
 
+-- name: IsNull :many
+SELECT id IS NULL FROM bar;
 
-
-
-
-
+-- name: IsNotNull :many
+SELECT id IS NOT NULL FROM bar;
diff --git a/internal/engine/dolphin/convert.go b/internal/engine/dolphin/convert.go
index 6b03774ebc..4a4478c65a 100644
--- a/internal/engine/dolphin/convert.go
+++ b/internal/engine/dolphin/convert.go
@@ -953,7 +953,18 @@ func (c *cc) convertIndexPartSpecification(n *pcast.IndexPartSpecification) ast.
 }
 
 func (c *cc) convertIsNullExpr(n *pcast.IsNullExpr) ast.Node {
-	return todo(n)
+	op := ast.BoolExprTypeIsNull
+	if n.Not {
+		op = ast.BoolExprTypeIsNotNull
+	}
+	return &ast.BoolExpr{
+		Boolop: op,
+		Args: &ast.List{
+			Items: []ast.Node{
+				c.convert(n.Expr),
+			},
+		},
+	}
 }
 
 func (c *cc) convertIsTruthExpr(n *pcast.IsTruthExpr) ast.Node {
diff --git a/internal/sql/ast/bool_expr_type.go b/internal/sql/ast/bool_expr_type.go
index 0296a9691d..7a4068d102 100644
--- a/internal/sql/ast/bool_expr_type.go
+++ b/internal/sql/ast/bool_expr_type.go
@@ -6,6 +6,10 @@ const (
 	BoolExprTypeAnd
 	BoolExprTypeOr
 	BoolExprTypeNot
+
+	// Added for MySQL
+	BoolExprTypeIsNull
+	BoolExprTypeIsNotNull
 )
 
 type BoolExprType uint