[jira] [Updated] (SPARK-3036) Add MapType containing null value support to Parquet.

["Michael Armbrust (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-3036?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Michael Armbrust updated SPARK-3036:
------------------------------------

    Assignee: Takuya Ueshin

> Add MapType containing null value support to Parquet.
> -----------------------------------------------------
>
>                 Key: SPARK-3036
>                 URL: https://issues.apache.org/jira/browse/SPARK-3036
>             Project: Spark
>          Issue Type: Bug
>          Components: SQL
>            Reporter: Takuya Ueshin
>            Assignee: Takuya Ueshin
>            Priority: Blocker
>
> Current Parquet schema for {{MapType}} is as follows regardless of {{valueContainsNull}}:
> {noformat}
> message root {
>   optional group a (MAP) {
>     repeated group map (MAP_KEY_VALUE) {
>       required int32 key;
>       required int32 value;
>     }
>   }
> }
> {noformat}
> and if the map contains {{null}} value, it throws runtime exception.
> To handle {{MapType}} containing {{null}} value, the schema should be as follows if {{valueContainsNull}} is {{true}}:
> {noformat}
> message root {
>   optional group a (MAP) {
>     repeated group map (MAP_KEY_VALUE) {
>       required int32 key;
>       optional int32 value;
>     }
>   }
> }
> {noformat}
> FYI:
> Hive's Parquet writer *always* uses the latter schema, but reader can read from both schema.
> NOTICE:
> This change will break backward compatibility when the schema is read from Parquet metadata ({{"org.apache.spark.sql.parquet.row.metadata"}}).



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