Fix insertion errors from the previous change.

Strip out common identifier quoting characters so that the default row
has the same keys as the data being inserted.

src/Database/Expression/ValuesExpression.php

@@ -151,7 +151,13 @@ class ValuesExpression implements ExpressionInterface
         }
 
         $i = 0;
-        $defaults = array_fill_keys($this->_columns, null);
+        $columns = [];
+
+        // Remove identifier quoting so column names match keys.
+        foreach ($this->_columns as $col) {
+            $columns[] = trim($col, '`[]"');
+        }
+        $defaults = array_fill_keys($columns, null);
         $placeholders = [];
 
         foreach ($this->_values as $row) {
@@ -173,7 +179,6 @@ class ValuesExpression implements ExpressionInterface
         if ($this->query()) {
             return ' ' . $this->query()->sql($generator);
         }
-
         return sprintf(' VALUES (%s)', implode('), (', $placeholders));
     }
 

src/Database/Query.php

@@ -1320,8 +1320,11 @@ class Query implements ExpressionInterface, IteratorAggregate
         $this->_dirty();
         $this->_type = 'insert';
         $this->_parts['insert'][1] = $columns;
-        $this->_parts['values'] = new ValuesExpression($columns, $this->typeMap()->types($types));
-
+        if (!$this->_parts['values']) {
+            $this->_parts['values'] = new ValuesExpression($columns, $this->typeMap()->types($types));
+        } else {
+            $this->_parts['values']->columns($columns);
+        }
         return $this;
     }