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https://issues.apache.org/jira/browse/DRILL-7672?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Arina Ielchiieva updated DRILL-7672:
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Reviewer: Vova Vysotskyi
> Make metadata type required when reading from / writing into Drill Metastore
> ----------------------------------------------------------------------------
>
> Key: DRILL-7672
> URL: https://issues.apache.org/jira/browse/DRILL-7672
> Project: Apache Drill
> Issue Type: Improvement
> Affects Versions: 1.17.0
> Reporter: Arina Ielchiieva
> Assignee: Arina Ielchiieva
> Priority: Major
> Fix For: 1.18.0
>
>
> Metastore consists of components: TABLES, VIEWS etc (so far only TABLES are
> implemented). Each component metadata can have types. For examples, TABLES
> metadata can be of the following types: TABLE, SEGMENT, FILE, ROW_GROUP,
> PARTITION.
> During initial Metastore implementation when reading from / writing into
> Metastore, metadata type was indicated in filter expressions.
> For Iceberg Metastore where all data is stored in files this was not this
> critical, basically when information is retrieved about the table, table
> folder is queried.
> For other Metastore implementations knowing metadata type can be more
> critical. For example, RDBMS Metastore would store TABLES metadata in
> different tables thus knowing which table to query would improve performance
> rather than trying to query all tables.
> Of course, we could traverse query filter and look for the hints which
> metadata type is needed but it is much better to know required metadata type
> beforehand without any extra logic.
> Taking into account that Metastore metadata is queried only in Drill code,
> developer knows beforehand what he needs to get / update / delete.
> This Jira aims to make metadata type required when reading from / writing
> into Drill Metastore. This change does not have any affect on the users, just
> internal code refactoring.
>
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