Class PigTable

  • All Implemented Interfaces:
    ScannableTable, Table, Wrapper

    public class PigTable
    extends AbstractTable
    implements ScannableTable
    A non-queriable table that contains only row type to represent a Pig Table. This table is used for constructing Calcite logical plan from Pig DAG.
    • Field Detail

      • DUMMY_STATISTICS

        private static final Statistic DUMMY_STATISTICS
    • Constructor Detail

    • Method Detail

      • createRelOptTable

        public static RelOptTable createRelOptTable​(RelOptSchema schema,
                                                    RelDataType rowType,
                                                    java.util.List<java.lang.String> names)
        Creates a RelOptTable for a schema only table.
        Parameters:
        schema - Catalog object
        rowType - Relational schema for the table
        names - Names of Pig table
      • getRowType

        public RelDataType getRowType​(RelDataTypeFactory typeFactory)
        Description copied from interface: Table
        Returns this table's row type.

        This is a struct type whose fields describe the names and types of the columns in this table.

        The implementer must use the type factory provided. This ensures that the type is converted into a canonical form; other equal types in the same query will use the same object.

        Specified by:
        getRowType in interface Table
        Parameters:
        typeFactory - Type factory with which to create the type
        Returns:
        Row type
      • scan

        public Enumerable<java.lang.Object[]> scan​(DataContext root)
        Description copied from interface: ScannableTable
        Returns an enumerator over the rows in this Table. Each row is represented as an array of its column values.
        Specified by:
        scan in interface ScannableTable