Fix pivot macro test

Author: georgesittas

sqlmesh/core/macros.py

@@ -1128,7 +1128,7 @@ def haversine_distance(
 def pivot(
     evaluator: MacroEvaluator,
     column: SQL,
-    values: t.List[SQL],
+    values: t.List[exp.Expression],
     alias: bool = True,
     agg: exp.Expression = exp.Literal.string("SUM"),
     cmp: exp.Expression = exp.Literal.string("="),
@@ -1146,23 +1146,23 @@ def pivot(
         >>> from sqlmesh.core.macros import MacroEvaluator
         >>> sql = "SELECT date_day, @PIVOT(status, ['cancelled', 'completed']) FROM rides GROUP BY 1"
         >>> MacroEvaluator().transform(parse_one(sql)).sql()
-        'SELECT date_day, SUM(CASE WHEN status = \\'cancelled\\' THEN 1 ELSE 0 END) AS "\\'cancelled\\'", SUM(CASE WHEN status = \\'completed\\' THEN 1 ELSE 0 END) AS "\\'completed\\'" FROM rides GROUP BY 1'
+        'SELECT date_day, SUM(CASE WHEN status = \\'cancelled\\' THEN 1 ELSE 0 END) AS "cancelled", SUM(CASE WHEN status = \\'completed\\' THEN 1 ELSE 0 END) AS "completed" FROM rides GROUP BY 1'
         >>> sql = "SELECT @PIVOT(a, ['v'], then_value := tv, suffix := '_sfx', quote := FALSE)"
         >>> MacroEvaluator(dialect="bigquery").transform(parse_one(sql)).sql("bigquery")
-        "SELECT SUM(CASE WHEN a = 'v' THEN tv ELSE 0 END) AS `v_sfx`"
+        "SELECT SUM(CASE WHEN a = 'v' THEN tv ELSE 0 END) AS v_sfx"
     """
     aggregates: t.List[exp.Expression] = []
     for value in values:
         proj = f"{agg.name}("
         if distinct:
             proj += "DISTINCT "
 
-        proj += f"CASE WHEN {column} {cmp.name} {value} THEN {then_value} ELSE {else_value} END) "
+        proj += f"CASE WHEN {column} {cmp.name} {value.sql(evaluator.dialect)} THEN {then_value} ELSE {else_value} END) "
         node = evaluator.parse_one(proj)
 
         if alias:
             node = node.as_(
-                f"{prefix.name}{value}{suffix.name}",
+                f"{prefix.name}{value.name}{suffix.name}",
                 quoted=quote,
                 copy=False,
                 dialect=evaluator.dialect,