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Posted to issues-all@impala.apache.org by "Daniel Becker (Jira)" <ji...@apache.org> on 2022/11/15 09:35:00 UTC
[jira] [Resolved] (IMPALA-11719) Inconsistency in printing NULL values
[ https://issues.apache.org/jira/browse/IMPALA-11719?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Daniel Becker resolved IMPALA-11719.
------------------------------------
Resolution: Fixed
> Inconsistency in printing NULL values
> -------------------------------------
>
> Key: IMPALA-11719
> URL: https://issues.apache.org/jira/browse/IMPALA-11719
> Project: IMPALA
> Issue Type: Bug
> Components: Backend
> Reporter: Daniel Becker
> Assignee: Daniel Becker
> Priority: Major
>
> If they are top level or in collections, null values are printed as "NULL":
> {code:java}
> select int_array from functional_parquet.complextypestbl;
> +------------------------+
> | int_array |
> +------------------------+
> | [-1] |
> | [1,2,3] |
> | [NULL,1,2,NULL,3,NULL] |
> | [] |
> | NULL |
> | NULL |
> | NULL |
> | NULL |
> +------------------------+{code}
> If they are in a struct, they are printed as "null":
> {code:java}
> select small_struct from functional_parquet.complextypes_structs;
> +------------------------------------+
> | small_struct |
> +------------------------------------+
> | NULL |
> | {"i":19191,"s":"small_struct_str"} |
> | {"i":98765,"s":null} |
> | {"i":null,"s":"str"} |
> | {"i":98765,"s":"abcde f"} |
> | {"i":null,"s":null} |
> +------------------------------------+{code}
> In Hive the situation is a bit different: "NULL" is used only for top level values and "null" is printed in both collections and structs.
> {code:java}
> select int_array from functional_parquet.complextypestbl;
> +-------------------------+
> | int_array |
> +-------------------------+
> | [-1] |
> | [1,2,3] |
> | [null,1,2,null,3,null] |
> | [] |
> | NULL |
> | NULL |
> | NULL |
> | NULL |
> +-------------------------+{code}
> {code:java}
> select small_struct from functional_parquet.complextypes_structs;
> +-------------------------------------+
> | small_struct |
> +-------------------------------------+
> | NULL |
> | {"i":19191,"s":"small_struct_str"} |
> | {"i":98765,"s":null} |
> | {"i":null,"s":"str"} |
> | {"i":98765,"s":"abcde f"} |
> | {"i":null,"s":null} |
> +-------------------------------------+{code}
> Officially we print collections and structs in JSON form. In JSON the relevant keyword is "null".
> We should decide how we handle this situation.
> # Have a uniform NULL representation everywhere: top level, collections and structs
> ** either "NULL" or "null" everywhere
> # Have "NULL" on the top level and "null" in collections and structs, like Hive
> # Leave everything as it is now: "NULL" at the top level and in collections, "null" in structs.
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