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sealed trait Descriptor extends AnyRef

A database object(such as database, table, function) descriptor describes its name and getter in/from another object(such as a spark sql command).

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Known Subclasses
ActionTypeDesc, CatalogDesc, ColumnDesc, DatabaseDesc, FunctionDesc, FunctionTypeDesc, QueryDesc, ScanDesc, TableDesc, TableTypeDesc
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Abstract Value Members

  1. abstract def extract(v: AnyRef): AnyRef

    Apply the field Extractor to the field value to extract key information we want to represents a table, column list, etc.

  2. abstract def fieldExtractor: String

    The key that points the Extractor to for the field, which extracts key information we want to represents a table, column list, etc.

  3. abstract def fieldName: String

    Describes the field name, such as a table field name in the spark logical plan.

    Describes the field name, such as a table field name in the spark logical plan.

    returns

    the database object field name

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