fix(query/v2): reject empty logical helpers

Author: zinic

query/v2/query.go

@@ -214,6 +214,10 @@ func valueExpression(value any) cypher.Expression {
 }
 
 func joinedExpressionList(operator cypher.Operator, operands []cypher.SyntaxNode) cypher.SyntaxNode {
+	if len(operands) == 0 {
+		return invalidExpression(fmt.Errorf("%s requires at least one operand", operator))
+	}
+
 	expressionList := &cypher.Comparison{}
 
 	if len(operands) > 0 {

query/v2/query_test.go

@@ -250,6 +250,14 @@ func TestMixedNodeAndRelationshipIdentifiersReturnError(t *testing.T) {
 	require.ErrorContains(t, err, "query mixes node and relationship query identifiers")
 }
 
+func TestEmptyLogicalHelpersReturnBuildErrors(t *testing.T) {
+	_, err := v2.New().Where(v2.And()).Return(v2.Node()).Build()
+	require.ErrorContains(t, err, "and requires at least one operand")
+
+	_, err = v2.New().Where(v2.Or()).Return(v2.Node()).Build()
+	require.ErrorContains(t, err, "or requires at least one operand")
+}
+
 func TestInvalidExplicitRelationshipPatternDirectionReturnsError(t *testing.T) {
 	_, err := v2.New().Create(
 		v2.RelationshipPattern(graph.StringKind("Edge"), nil, graph.DirectionBoth),