Fix L022 to not flag CTE column definitions

src/sqlfluff/rules/L022.py

@@ -54,7 +54,20 @@ def _eval(self, context: RuleContext) -> Optional[List[LintResult]]:
             )
             for idx, seg in enumerate(expanded_segments):
                 if seg.is_type("bracketed"):
-                    bracket_indices.append(idx)
+                    # Check if the preceding keyword is AS, otherwise it's a column name definition in the CTE.
+                    preceding_keyword = next(
+                        (
+                            s
+                            for s in expanded_segments[:idx][::-1]
+                            if s.is_type("keyword")
+                        ),
+                        None,
+                    )
+                    if (
+                        preceding_keyword is not None
+                        and preceding_keyword.raw.upper() == "AS"
+                    ):
+                        bracket_indices.append(idx)
 
             # Work through each point and deal with it individually
             for bracket_idx in bracket_indices:

test/fixtures/rules/std_rule_cases/L022.yml

@@ -151,3 +151,14 @@ test_fail_cte_floating_comma:
     other_cte as (select 1)
 
     select * from my_cte cross join other_cte
+
+test_pass_column_name_definition:
+  # Issue #2136
+  pass_str: |
+    with recursive t(n) as (
+        select 1
+        union all
+        select n + 1 from t
+    )
+
+    select n from t limit 100;