Java Code Examples for org.apache.calcite.rel.logical.LogicalCorrelate#getLeft()

The following examples show how to use org.apache.calcite.rel.logical.LogicalCorrelate#getLeft() . You can vote up the ones you like or vote down the ones you don't like, and go to the original project or source file by following the links above each example. You may check out the related API usage on the sidebar.
Example 1
Source File: DrillCorrelateRule.java    From Bats with Apache License 2.0 5 votes vote down vote up 
@Override
public void onMatch(RelOptRuleCall call) {
  final LogicalCorrelate correlate = call.rel(0);
  final RelNode left = correlate.getLeft();
  final RelNode right = correlate.getRight();
  final RelNode convertedLeft = convert(left, left.getTraitSet().plus(DrillRel.DRILL_LOGICAL).simplify());
  final RelNode convertedRight = convert(right, right.getTraitSet().plus(DrillRel.DRILL_LOGICAL).simplify());

  final RelTraitSet traits = correlate.getTraitSet().plus(DrillRel.DRILL_LOGICAL);
  DrillLateralJoinRel lateralJoinRel = new DrillLateralJoinRel(correlate.getCluster(),
      traits, convertedLeft, convertedRight, false, correlate.getCorrelationId(),
      correlate.getRequiredColumns(), correlate.getJoinType());
  call.transformTo(lateralJoinRel);
}
Example 2
Source File: ComplexUnnestVisitor.java    From Bats with Apache License 2.0 4 votes vote down vote up 
@Override
public RelNode visit(LogicalCorrelate correlate) {
  RelNode left = correlate.getLeft().accept(this);
  leftInputs.put(correlate.getCorrelationId(), left);

  RelNode right = correlate.getRight().accept(this);
  // if right input wasn't changed or left input wasn't changed
  // after rewriting right input, no need to create Correlate with new CorrelationId
  if (correlate.getRight() == right
      || left == leftInputs.get(correlate.getCorrelationId())) {
    if (correlate.getLeft() == left) {
      return correlate;
    }
    // changed only inputs, but CorrelationId left the same
    return correlate.copy(correlate.getTraitSet(), Arrays.asList(left, right));
  }

  Correlate newCorrelate = correlate.copy(correlate.getTraitSet(),
      leftInputs.get(correlate.getCorrelationId()), right,
      updatedCorrelationIds.get(correlate.getCorrelationId()),
      ImmutableBitSet.of(left.getRowType().getFieldCount()), correlate.getJoinType());

  RelBuilder builder = DrillRelFactories.LOGICAL_BUILDER.create(correlate.getCluster(), null);
  builder.push(newCorrelate);

  List<RexNode> topProjectExpressions = left.getRowType().getFieldList().stream()
          .map(field -> builder.getRexBuilder().makeInputRef(newCorrelate, field.getIndex()))
          .collect(Collectors.toList());

  //Accommodate the new $COMPLEX_FIELD_NAME column.
  int rightStartIndex = left.getRowType().getFieldList().size() + 1;
  switch (correlate.getJoinType()) {
    case LEFT:
    case INNER:
      // adds field from the right input of correlate to the top project
      topProjectExpressions.addAll(right.getRowType().getFieldList().stream()
              .map(field -> builder.getRexBuilder().makeInputRef(newCorrelate, field.getIndex() + rightStartIndex))
              .collect(Collectors.toList()));
      // fall through
    case ANTI:
    case SEMI:
      builder.project(topProjectExpressions, correlate.getRowType().getFieldNames());
  }
  return builder.build();
}