Fix column's statistics errors

app/ui/column_stats_dialog.py

@@ -19,12 +19,13 @@ class _StatsWorker(QThread):
         self._column   = column
 
     def run(self):
-        col  = self._column
-        tbl  = self._table
+        q    = self._driver.quote_identifier
+        col  = q(self._column)
+        tbl  = q(self._table)
         try:
             _, rows, _ = self._driver.execute_query(
-                f'SELECT COUNT(*), COUNT("{col}"), COUNT(DISTINCT "{col}"), '
-                f'MIN("{col}"), MAX("{col}") FROM "{tbl}"'
+                f'SELECT COUNT(*), COUNT({col}), COUNT(DISTINCT {col}), '
+                f'MIN({col}), MAX({col}) FROM {tbl}'
             )
             total, non_null, distinct, min_val, max_val = rows[0]
             null_count = (total or 0) - (non_null or 0)
@@ -35,7 +36,7 @@ class _StatsWorker(QThread):
         avg_val = None
         try:
             _, avg_rows, _ = self._driver.execute_query(
-                f'SELECT AVG("{col}") FROM "{tbl}"'
+                f'SELECT AVG({col}) FROM {tbl}'
             )
             avg_val = avg_rows[0][0]
         except Exception: