[jira] [Resolved] (PARQUET-1602) PageIndex not working as suggested ?

["Anthony Pessy (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/PARQUET-1602?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Anthony Pessy resolved PARQUET-1602.
------------------------------------
    Resolution: Not A Problem

> PageIndex not working as suggested ?
> ------------------------------------
>
>                 Key: PARQUET-1602
>                 URL: https://issues.apache.org/jira/browse/PARQUET-1602
>             Project: Parquet
>          Issue Type: Improvement
>          Components: parquet-mr
>    Affects Versions: 1.11.0
>            Reporter: Anthony Pessy
>            Priority: Major
>
> I have a schema such as:
> {code:java}
> schema message pages {
>   required binary url (STRING);
>   optional binary content (STRING);
> }
> {code}
> Where `url` is unique and ordered, the file is created in such a way that I have ~600 pages of `content` for 1 page of `url`.
>  
> From [https://github.com/apache/parquet-format/blob/master/PageIndex.md] I saw:
> {noformat}
> A single-row lookup in a rowgroup based on the sort column of that rowgroup will only read one data page per retrieved column.{noformat}
> I was expecting `ParquetReader`  to find the matching row thanks to the `FilterPredicate`  on `url`, decoding only this column, then, using `offset index`, directly seek to the appropriate page for `content` and decode it.
> Instead, what I'm seeing, is that the reader fully reads & decode the ~600 pages of content (until it actually find the url).
> Is there something I misunderstood or some step to ensure to make the reader only consume the necessary pages?
>  
>  
>  
>  



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