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Posted to issues@arrow.apache.org by "Micah Kornfield (Jira)" <ji...@apache.org> on 2020/04/17 04:17:00 UTC
[jira] [Updated] (ARROW-8493) [C++] Create unified schema
resolution code for Array reconstruction.
[ https://issues.apache.org/jira/browse/ARROW-8493?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Micah Kornfield updated ARROW-8493:
-----------------------------------
Description:
We need a function/class that can take the parquet schema and a proposed arrow schema (potentially retrieved from parquet metadata) and outputs a data structure that contains, all of the information in "SchemaField" and the following additional options:
1. Corresponding Definition level for nullability (wouldn't be populated for non-null arrays).
2. Correspond Repetition level for lists (wouldn't be populated for for non-lists).
3. Definition level for "empty lists". (wouldn't be populated for legacy two level encoded lists).
One option is to augment and populate these on the SchemaField.
was:
We need a function/class that can take the parquet schema and a proposed arrow schema (potentially retrieved from parquet metadata) and outputs a data structure that contains, all of the information in "SchemaField" and the following additional options:
1. Corresponding Definition level for nullability (wouldn't be populated for non-null arrays).
2. Correspond Repetition level for lists (wouldn't be populated for for non-lists).
One option is to augment and populate these on the SchemaField.
> [C++] Create unified schema resolution code for Array reconstruction.
> ---------------------------------------------------------------------
>
> Key: ARROW-8493
> URL: https://issues.apache.org/jira/browse/ARROW-8493
> Project: Apache Arrow
> Issue Type: Sub-task
> Components: C++
> Reporter: Micah Kornfield
> Priority: Major
>
> We need a function/class that can take the parquet schema and a proposed arrow schema (potentially retrieved from parquet metadata) and outputs a data structure that contains, all of the information in "SchemaField" and the following additional options:
>
> 1. Corresponding Definition level for nullability (wouldn't be populated for non-null arrays).
> 2. Correspond Repetition level for lists (wouldn't be populated for for non-lists).
> 3. Definition level for "empty lists". (wouldn't be populated for legacy two level encoded lists).
>
> One option is to augment and populate these on the SchemaField.
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