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Posted to commits@hudi.apache.org by "sivabalan narayanan (Jira)" <ji...@apache.org> on 2021/02/02 16:03:00 UTC

[jira] [Commented] (HUDI-733) presto query data error

    [ https://issues.apache.org/jira/browse/HUDI-733?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17277228#comment-17277228 ] 

sivabalan narayanan commented on HUDI-733:
------------------------------------------

[~bhasudha]: do you mind following up with the user. 

> presto query data error
> -----------------------
>
>                 Key: HUDI-733
>                 URL: https://issues.apache.org/jira/browse/HUDI-733
>             Project: Apache Hudi
>          Issue Type: Bug
>          Components: Presto Integration
>    Affects Versions: 0.5.1
>            Reporter: jing
>            Assignee: Bhavani Sudha
>            Priority: Major
>              Labels: user-support-issues
>         Attachments: hive_table.png, parquet_context.png, parquet_schema.png, presto_query_data.png
>
>
> We found a data sequence issue in Hudi when we use API to import data(use spark.read.json("filename") read to dataframe then write  to hudi). The original d is rowkey:1 dt:2 time:3.
> But the value is unexpected when query the data by Presto(rowkey:2 dt:1 time:2), but correctly in Hive.
> After analysis, if I use dt to partition the column data, it is also written in the parquet file. dt = xxx, and the value of the partition column should be the value in the path of the hudi. However, I found that the value of the presto query must be one-to-one with the columns in the parquet. He will not detect the column names.
> Transformation methods and suggestions:
>  # Can the inputformat class be ignored to read the column value of the partition column dt in parquet?
>  # Can hive data be synchronized without dt as a partition column? Consider adding a column such as repl_dt as a partition column and dt as an ordinary field.
>  # The dt column is not written to the parquet file.
>      4, dt is written to the parquet file, but as the last column.
>  
> [~bhasudha]



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