[jira] [Updated] (PARQUET-473) [C++] Develop external predicate pushdown API for column readers

["Wes McKinney (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/PARQUET-473?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Wes McKinney updated PARQUET-473:
---------------------------------
    Summary: [C++] Develop external predicate pushdown API for column readers  (was: Develop external predicate pushdown API for column readers)

> [C++] Develop external predicate pushdown API for column readers
> ----------------------------------------------------------------
>
>                 Key: PARQUET-473
>                 URL: https://issues.apache.org/jira/browse/PARQUET-473
>             Project: Parquet
>          Issue Type: New Feature
>          Components: parquet-cpp
>            Reporter: Wes McKinney
>            Priority: Major
>
> This will happen significantly downstream of where we are at right now, but we should be planning ahead to facilitate scanning Parquet files with externally-defined predicates as a primary use case. 
> I suggest that the most general (and high performance) predicate will be batch-oriented; i.e. the predicate will be passed a batch of materialized values from one or more columns, and it returns an array of booleans indicating whether or not the predicate is true. We can also develop a row-by-row "scalar" predicate API if users need that. 



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