Create column_resolver.py

column_resolver.py

@@ -0,0 +1,22 @@
+import re
+from typing import List, Dict
+
+def _norm(s: str) -> str:
+    return re.sub(r'[^a-z0-9]+', '', s.lower())
+
+def build_alias_map(columns: List[str]) -> Dict[str, str]:
+    m = {}
+    for c in columns:
+        n = _norm(c)
+        m[n] = c
+        if n.endswith('s') and n[:-1] not in m: m[n[:-1]] = c
+        if not n.endswith('s') and n+'s' not in m: m[n+'s'] = c
+    return m
+
+def resolve_cols(requested: List[str], available: List[str]) -> List[str]:
+    alias = build_alias_map(available)
+    out = []
+    for r in requested:
+        n = _norm(r)
+        out.append(alias.get(n, r))
+    return out