Fix: replace between before normalization

sqlglot/optimizer/normalize.py

@@ -6,7 +6,7 @@
 from sqlglot.errors import OptimizeError
 from sqlglot.generator import cached_generator
 from sqlglot.helper import while_changing
-from sqlglot.optimizer.simplify import flatten, uniq_sort
+from sqlglot.optimizer.simplify import flatten, rewrite_between, uniq_sort
 
 logger = logging.getLogger("sqlglot")
 
@@ -34,7 +34,10 @@ def normalize(expression: exp.Expression, dnf: bool = False, max_distance: int =
         if isinstance(node, exp.Connector):
             if normalized(node, dnf=dnf):
                 continue
+            root = node is expression
+            original = node.copy()
 
+            node.transform(rewrite_between, copy=False)
             distance = normalization_distance(node, dnf=dnf)
 
             if distance > max_distance:
@@ -43,8 +46,6 @@ def normalize(expression: exp.Expression, dnf: bool = False, max_distance: int =
                 )
                 return expression
 
-            root = node is expression
-            original = node.copy()
             try:
                 node = node.replace(
                     while_changing(node, lambda e: distributive_law(e, dnf, max_distance, generate))

tests/fixtures/optimizer/normalize.sql

@@ -42,3 +42,6 @@ A OR ((((B OR C) AND (B OR D)) OR C) AND (((B OR C) AND (B OR D)) OR D));
 
 SELECT * FROM x WHERE (A AND B) OR C;
 SELECT * FROM x WHERE (A OR C) AND (B OR C);
+
+dt2 between '2022-01-01 12:00:00' and '2022-12-31' and dt2 >= '2022-05-01 12:00:00' or dt2 = '2021-06-01 12:00:00';
+(dt2 <= '2022-12-31' OR dt2 = '2021-06-01 12:00:00') AND (dt2 = '2021-06-01 12:00:00' OR dt2 >= '2022-01-01 12:00:00') AND (dt2 = '2021-06-01 12:00:00' OR dt2 >= '2022-05-01 12:00:00')