CreateQuery invalid_lc_null (children 3)
 Identifier invalid_lc_null
 Columns definition (children 1)
  ExpressionList (children 1)
   ColumnDeclaration id (children 1)
    DataType LowCardinality (children 1)
     ExpressionList (children 1)
      DataType Nullable (children 1)
       ExpressionList (children 1)
        DataType String
 Storage definition (children 2)
  Function MergeTree
  Identifier id
