Package org.apache.drill.metastore.rdbms.transform

Interface MetadataMapper<U,R extends org.jooq.Record>

Type Parameters:
U - Metastore component metadata type
R - RDBMS table record type
All Known Implementing Classes:
AbstractMetadataMapper, TablesMetadataMapper, TablesMetadataMapper.FileMapper, TablesMetadataMapper.PartitionMapper, TablesMetadataMapper.RowGroupMapper, TablesMetadataMapper.SegmentMapper, TablesMetadataMapper.TableMapper
public interface MetadataMapper<U,R extends org.jooq.Record>
Provides various mapping, transformation methods for the given RDBMS table and Metastore component metadata unit.

  • Method Summary

    Modifier and Type
    Method
    Description
    U
    emptyUnit()
     
    org.jooq.Table<R>
    table()
     
    org.jooq.Condition
    toCondition(FilterExpression filter)
    Converts Metastore filter expression into JOOQ condition instance which will be used as where clause in SQL query.
    List<org.jooq.Condition>
    toDeleteConditions(List<U> units)
    Since data in Metastore is deleted by partition, extracts partitions values from given list of Metastore component metadata units and creates list of delete conditions based on them.
    List<org.jooq.Field<?>>
    toFields(List<MetastoreColumn> columns)
    Matches given list of Metastore columns to the available RDBMS table columns.
    R
    toRecord(U unit)
    Converts Metastore component metadata unit into RDBMS table record.
    U
    toUnit(org.jooq.Record record)
    Converts RDBMS table record into Metastore component metadata unit.

  • Method Details

    • table

      org.jooq.Table<R> table()
      Returns:
      RDBMS table instance

    • emptyUnit

      U emptyUnit()
      Returns:
      Metastore component metadata unit instance with all fields set to null

    • toUnit

      U toUnit(org.jooq.Record record)
      Converts RDBMS table record into Metastore component metadata unit.
      Parameters:
      record - RDBMS table record
      Returns:
      Metastore component metadata unit instance

    • toRecord

      R toRecord(U unit)
      Converts Metastore component metadata unit into RDBMS table record.
      Parameters:
      unit - Metastore component metadata unit
      Returns:
      RDBMS table record instance

    • toFields

      List<org.jooq.Field<?>> toFields(List<MetastoreColumn> columns)
      Matches given list of Metastore columns to the available RDBMS table columns.
      Parameters:
      columns - list of Metastore columns
      Returns:
      list of RDBMS table fields

    • toCondition

      org.jooq.Condition toCondition(FilterExpression filter)
      Converts Metastore filter expression into JOOQ condition instance which will be used as where clause in SQL query.
      Parameters:
      filter - filter expression
      Returns:
      JOOQ condition instance

    • toDeleteConditions

      List<org.jooq.Condition> toDeleteConditions(List<U> units)
      Since data in Metastore is deleted by partition, extracts partitions values from given list of Metastore component metadata units and creates list of delete conditions based on them.
      Parameters:
      units - list of Metastore component metadata units
      Returns:
      list of JOOQ condition instances