use of io.druid.sql.calcite.rel.DruidSemiJoin in project druid by druid-io.
the class DruidSemiJoinRule method onMatch.
@Override
public void onMatch(RelOptRuleCall call) {
final Project project = call.rel(0);
final Join join = call.rel(1);
final DruidRel left = call.rel(2);
final DruidRel right = call.rel(3);
final ImmutableBitSet bits = RelOptUtil.InputFinder.bits(project.getProjects(), null);
final ImmutableBitSet rightBits = ImmutableBitSet.range(left.getRowType().getFieldCount(), join.getRowType().getFieldCount());
if (bits.intersects(rightBits)) {
return;
}
final JoinInfo joinInfo = join.analyzeCondition();
final List<Integer> rightDimsOut = new ArrayList<>();
for (DimensionSpec dimensionSpec : right.getQueryBuilder().getGrouping().getDimensions()) {
rightDimsOut.add(right.getOutputRowSignature().getRowOrder().indexOf(dimensionSpec.getOutputName()));
}
if (!joinInfo.isEqui() || !joinInfo.rightSet().equals(ImmutableBitSet.of(rightDimsOut))) {
// By the way, neither a super-set nor a sub-set would work.
return;
}
final RelBuilder relBuilder = call.builder();
final PlannerConfig plannerConfig = left.getPlannerContext().getPlannerConfig();
if (join.getJoinType() == JoinRelType.LEFT) {
// Join can be eliminated since the right-hand side cannot have any effect (nothing is being selected,
// and LEFT means even if there is no match, a left-hand row will still be included).
relBuilder.push(left);
} else {
final DruidSemiJoin druidSemiJoin = DruidSemiJoin.from(left, right, joinInfo.leftKeys, joinInfo.rightKeys, plannerConfig);
if (druidSemiJoin == null) {
return;
}
// Check maxQueryCount.
if (plannerConfig.getMaxQueryCount() > 0 && druidSemiJoin.getQueryCount() > plannerConfig.getMaxQueryCount()) {
return;
}
relBuilder.push(druidSemiJoin);
}
call.transformTo(relBuilder.project(project.getProjects(), project.getRowType().getFieldNames()).build());
}
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