feat(inspect): Add base class for metadata table support#607
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wgtmac
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wgtmac
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Thanks for working on this! I've left some preliminary comments.
| class UpdateSortOrder; | ||
| class UpdateStatistics; | ||
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| /// \brief Metadata tables. |
| /// | ||
| /// Once a table scan builder is created, it can be refined to project columns and | ||
| /// filter data. | ||
| Result<std::unique_ptr<TableScanBuilder>> NewScan() const; |
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| std::shared_ptr<Table> source_table_; | ||
| std::string uuid_; | ||
| std::shared_ptr<Schema> schema_; |
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Member variables here and below are not necessary
| const std::string& uuid() const { return uuid_; } | ||
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| /// \brief Returns the schema for this table, return NotFoundError if not found | ||
| Result<std::shared_ptr<Schema>> schema() const { return schema_; } |
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Let's remove these redefinitions here and below
| /// | ||
| /// \param table The source table | ||
| /// \return A SnapshotsTable exposing all snapshots or error status | ||
| static Result<std::unique_ptr<SnapshotsTable>> GetSnapshotsTable( |
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It looks cumbersome to use a function per type. Can we use enum metadata type or canonical metadata table name suffix instead to return a std::unique_ptr<Table> instead?
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BTW, do we want to support the case when users directly create a metadata table without having a table object? For example, users may directly create a metadata table from catalog by calling LoadTable and providing full table identifier with metadata table suffix.
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This PR kicks off the implementation of table inspection support.
BaseMetadataTableclass (without scan support for now).MetadataTableFactoryas an entry point for creating metadata tables.SnapshotsTableandHistoryTableas example impl.