Specifies the data model to use when parsing Parquet documents and generating the database metadata.

Possible Values

データ型

string

デフォルト値

"Document"

解説

The 本製品 splits documents into rows based on the objects nested in arrays. Select a DataModel configuration to configure how the 本製品 models nested object arrays into tables.

Selecting a Data Modeling Strategy

The following DataModel configurations are available.

• Document

  Returns a single table representing a row for each top-level object. In this data model, any nested object arrays will not be flattened and will be returned as aggregates.

• FlattenedDocuments

  Returns a single table representing a SQL CROSS JOIN of the available documents in the file.

• Relational

  Returns multiple tables, one for each nested object array. In this data model, any nested documents (object arrays) will be returned as relational tables that contain a primary key and a foreign key that links to the parent table.

See Also

• FlattenArrays and FlattenObjects: Customize the columns that will be identified for each of these data models.
• 階層データの解析: Compare the schemas resulting from different DataModel settings, with example queries.