AlterQuery  test_alter_drop_comment (children 2)
 ExpressionList (children 3)
  AlterCommand DROP_COLUMN (children 1)
   Identifier c1
  AlterCommand COMMENT_COLUMN (children 2)
   Identifier c1
   Literal \'dropped column comment\'
  AlterCommand COMMENT_COLUMN (children 2)
   Identifier c2
   Literal \'existing column comment\'
 Identifier test_alter_drop_comment
