Examples of org.eigenbase.relopt.hep.HepProgramBuilder

org.eigenbase.relopt.hep.HepProgramBuilder
HepProgramBuilder creates instances of {@link HepProgram}.

        + "(select * from emp e1 union all select * from emp e2) r2");
  }


  @Ignore("cycles")
  @Test public void testMergeFilterWithJoinCondition() throws Exception {
    HepProgram program = new HepProgramBuilder()
        .addRuleInstance(TableAccessRule.INSTANCE)
        .addRuleInstance(ExtractJoinFilterRule.INSTANCE)
        .addRuleInstance(FilterToCalcRule.INSTANCE)
        .addRuleInstance(MergeCalcRule.INSTANCE)
            //.addRuleInstance(FennelCalcRule.instance);

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    // of the projections, we force a Fennel implementation.
    // For the other, we force a Java implementation.
    // Then, we request conversion from Fennel to Java,
    // and verify that it only applies to one usage of the
    // table, not both (which would be incorrect).
    HepProgram program = new HepProgramBuilder()
        .addRuleInstance(TableAccessRule.INSTANCE)
        .addRuleInstance(ProjectToCalcRule.INSTANCE)


            // Control the calc conversion.
        .addMatchLimit(1)

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        + " select lower(ename) from emp");
  }


  @Test public void testPushSemiJoinPastJoinRuleLeft() throws Exception {
    // tests the case where the semijoin is pushed to the left
    HepProgram program = new HepProgramBuilder()
        .addRuleInstance(PushFilterPastJoinRule.FILTER_ON_JOIN)
        .addRuleInstance(AddRedundantSemiJoinRule.INSTANCE)
        .addRuleInstance(PushSemiJoinPastJoinRule.INSTANCE)
        .build();
    checkPlanning(program,

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        + "where e1.deptno = d.deptno and e1.empno = e2.empno");
  }


  @Test public void testPushSemiJoinPastJoinRuleRight() throws Exception {
    // tests the case where the semijoin is pushed to the right
    HepProgram program = new HepProgramBuilder()
        .addRuleInstance(PushFilterPastJoinRule.FILTER_ON_JOIN)
        .addRuleInstance(AddRedundantSemiJoinRule.INSTANCE)
        .addRuleInstance(PushSemiJoinPastJoinRule.INSTANCE)
        .build();
    checkPlanning(program,

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        "select e1.ename from emp e1, dept d, emp e2 "
        + "where e1.deptno = d.deptno and d.deptno = e2.deptno");
  }


  @Test public void testPushSemiJoinPastFilter() throws Exception {
    HepProgram program = new HepProgramBuilder()
        .addRuleInstance(PushFilterPastJoinRule.FILTER_ON_JOIN)
        .addRuleInstance(AddRedundantSemiJoinRule.INSTANCE)
        .addRuleInstance(PushSemiJoinPastFilterRule.INSTANCE)
        .build();
    checkPlanning(program,

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        "select e.ename from emp e, dept d "
        + "where e.deptno = d.deptno and e.ename = 'foo'");
  }


  @Test public void testConvertMultiJoinRule() throws Exception {
    HepProgram program = new HepProgramBuilder()
        .addRuleInstance(PushFilterPastJoinRule.FILTER_ON_JOIN)
        .addMatchOrder(HepMatchOrder.BOTTOM_UP)
        .addRuleInstance(ConvertMultiJoinRule.INSTANCE)
        .build();
    checkPlanning(program,

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        "select e1.ename from emp e1, dept d, emp e2 "
        + "where e1.deptno = d.deptno and d.deptno = e2.deptno");
  }


  @Test public void testReduceConstants() throws Exception {
    HepProgram program = new HepProgramBuilder()
        .addRuleInstance(ReduceExpressionsRule.PROJECT_INSTANCE)
        .addRuleInstance(ReduceExpressionsRule.FILTER_INSTANCE)
        .addRuleInstance(ReduceExpressionsRule.JOIN_INSTANCE)
        .build();

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        + " on d.deptno = e.deptno + (5-5)"
        + " where d.deptno=(7+8) and d.deptno=coalesce(2,null)");
  }


  @Test public void testReduceConstants2() throws Exception {
    HepProgram program = new HepProgramBuilder()
        .addRuleInstance(ReduceExpressionsRule.PROJECT_INSTANCE)
        .addRuleInstance(ReduceExpressionsRule.FILTER_INSTANCE)
        .addRuleInstance(ReduceExpressionsRule.JOIN_INSTANCE)
        .build();

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    checkPlanning(program,
        "select p1 is not distinct from p0 from (values (2, cast(null as integer))) as t(p0, p1)");
  }


  @Test public void testReduceConstantsEliminatesFilter() throws Exception {
    HepProgram program = new HepProgramBuilder()
        .addRuleInstance(ReduceExpressionsRule.FILTER_INSTANCE)
        .build();


    // WHERE NULL is the same as WHERE FALSE, so get empty result
    checkPlanning(program,

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    checkPlanning(program,
        "select * from (values (1,2)) where 1 + 2 > 3 + CAST(NULL AS INTEGER)");
  }


  @Test public void testAlreadyFalseEliminatesFilter() throws Exception {
    HepProgram program = new HepProgramBuilder()
        .addRuleInstance(ReduceExpressionsRule.FILTER_INSTANCE)
        .build();


    checkPlanning(program,
        "select * from (values (1,2)) where false");

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