Fix spark lambdas

SQL.Formatter.Test/SparkSqlFormatter.cs

@@ -73,7 +73,8 @@ public void OperatorsTest()
                 "%",
                 "&&",
                 "||",
-                "=="
+                "==",
+                "->"
             });
         }
 

SQL.Formatter.Test/SqlFormatterTest.cs

@@ -95,5 +95,17 @@ public void WithIndexedParams()
                 + "  foo = 'bar'",
                 format);
         }
+
+        [Fact]
+        public void WithLambdasParams()
+        {
+            var format = SqlFormatter
+                .Of(Dialect.SparkSql)
+                .Format("SELECT aggregate(array(1, 2, 3), 0, (acc, x) -> acc + x, acc -> acc * 10);");
+            Assert.Equal(
+                "SELECT\n"
+                + "  aggregate(array(1, 2, 3), 0, (acc, x) -> acc + x, acc -> acc * 10);",
+                format);
+        }
     }
 }

SQL.Formatter/Language/SparkSqlFormatter.cs

@@ -243,7 +243,7 @@ public override DialectConfig DoDialectConfig()
                 .IndexedPlaceholderTypes(new List<string> { "?" })
                 .NamedPlaceholderTypes(new List<string> { "$" })
                 .LineCommentTypes(new List<string> { "--" })
-                .Operators(new List<string> { "!=", "<=>", "&&", "||", "==" })
+                .Operators(new List<string> { "!=", "<=>", "&&", "||", "==", "->" })
                 .Build();
         }