CreateQuery lc_null_str_0 (children 3)
 Identifier lc_null_str_0
 Columns definition (children 1)
  ExpressionList (children 1)
   ColumnDeclaration str (children 1)
    DataType LowCardinality (children 1)
     ExpressionList (children 1)
      DataType Nullable (children 1)
       ExpressionList (children 1)
        DataType String
 Storage definition (children 1)
  Function Memory