Examples of net.hydromatic.optiq.impl.StarTable

net.hydromatic.optiq.impl.StarTable
Virtual table that is composed of two or more tables joined together.
Star tables do not occur in end-user queries. They are introduced by the optimizer to help matching queries to materializations, and used only during the planning process.

When a materialization is defined, if it involves a join, it is converted to a query on top of a star table. Queries that are candidates to map onto the materialization are mapped onto the same star table.

   * The relational expression is already in leaf-join-form, per
   * {@link #toLeafJoinForm(org.eigenbase.rel.RelNode)}.
   */
  public static RelNode tryUseStar(RelNode rel,
      final RelOptTable starRelOptTable) {
    final StarTable starTable = starRelOptTable.unwrap(StarTable.class);
    assert starTable != null;
    return rel.accept(
        new RelShuttleImpl() {
          @Override
          public RelNode visit(TableAccessRelBase scan) {

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   * The relational expression is already in leaf-join-form, per
   * {@link #toLeafJoinForm(org.eigenbase.rel.RelNode)}.
   */
  public static RelNode tryUseStar(RelNode rel,
      final RelOptTable starRelOptTable) {
    final StarTable starTable = starRelOptTable.unwrap(StarTable.class);
    assert starTable != null;
    return rel.accept(
        new RelShuttleImpl() {
          @Override
          public RelNode visit(TableAccessRelBase scan) {

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   * The relational expression is already in leaf-join-form, per
   * {@link #toLeafJoinForm(org.eigenbase.rel.RelNode)}.
   */
  public static RelNode tryUseStar(RelNode rel,
      final RelOptTable starRelOptTable) {
    final StarTable starTable = starRelOptTable.unwrap(StarTable.class);
    assert starTable != null;
    RelNode rel2 = rel.accept(
        new RelShuttleImpl() {
          @Override
          public RelNode visit(TableAccessRelBase scan) {

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    public LatticeEntryImpl(OptiqSchema schema, String name, Lattice lattice) {
      super(schema, name);
      this.lattice = lattice;


      // Star table has same name as lattice and is in same schema.
      final StarTable starTable = lattice.createStarTable();
      starTableEntry = schema.add(name, starTable);
    }

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Related Classes of net.hydromatic.optiq.impl.StarTable

net.hydromatic.optiq.jdbc.OptiqSchema$LatticeEntryImpl

org.eigenbase.relopt.RelOptMaterialization

org.eigenbase.reltype.RelDataType

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