CreateQuery 03399_lc_nullable_string_mixed (children 4)
 Identifier 03399_lc_nullable_string_mixed
 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 2)
   SelectQuery (children 1)
    ExpressionList (children 2)
     Literal Array_[\'a\', \'b\']
     Literal Array_[UInt64_1, UInt64_2]
   SelectQuery (children 1)
    ExpressionList (children 2)
     Literal Array_[NULL, \'c\']
     Literal Array_[UInt64_3, UInt64_4]
