CreateQuery 03399_lc_nullable_string_simple (children 4)
 Identifier 03399_lc_nullable_string_simple
 Columns definition (children 1)
  ExpressionList (children 2)
   ColumnDeclaration k (children 1)
    DataType Array (children 1)
     ExpressionList (children 1)
      DataType LowCardinality (children 1)
       ExpressionList (children 1)
        DataType Nullable (children 1)
         ExpressionList (children 1)
          DataType String
   ColumnDeclaration v (children 1)
    DataType Array (children 1)
     ExpressionList (children 1)
      DataType Int32
 Storage definition (children 1)
  Function Memory
 SelectWithUnionQuery (children 1)
  ExpressionList (children 1)
   SelectQuery (children 1)
    ExpressionList (children 2)
     Literal Array_[\'a\', \'b\']
     Literal Array_[UInt64_1, UInt64_2]
