Examples with Project org.apache.calcite.rel.core.Project used on opensource projects

Example 61 with Project

use of org.apache.calcite.rel.core.Project in project hive by apache.

the class HiveWindowingLastValueRewrite method onMatch.

@Override
public void onMatch(RelOptRuleCall call) {
    Project project = call.rel(0);
    List<RexNode> newExprs = new ArrayList<>();
    LastValueRewriteRexShuttle lastValueRewrite = new LastValueRewriteRexShuttle(project.getCluster().getRexBuilder());
    boolean modified = false;
    for (RexNode expr : project.getProjects()) {
        RexNode newExpr = lastValueRewrite.apply(expr);
        newExprs.add(newExpr);
        modified |= (newExpr != expr);
    }
    if (modified) {
        RelNode newProject = project.copy(project.getTraitSet(), project.getInput(), newExprs, project.getRowType());
        call.transformTo(newProject);
    }
}

Example 62 with Project

use of org.apache.calcite.rel.core.Project in project hive by apache.

the class HiveRelFieldTrimmer method trimFields.

/**
 * Variant of {@link #trimFields(RelNode, ImmutableBitSet, Set)} for
 * {@link org.apache.calcite.adapter.druid.DruidQuery}.
 */
public TrimResult trimFields(DruidQuery dq, ImmutableBitSet fieldsUsed, Set<RelDataTypeField> extraFields) {
    final int fieldCount = dq.getRowType().getFieldCount();
    if (fieldsUsed.equals(ImmutableBitSet.range(fieldCount)) && extraFields.isEmpty()) {
        // then no need to introduce another RelNode
        return trimFields((RelNode) dq, fieldsUsed, extraFields);
    }
    final RelNode newTableAccessRel = project(dq, fieldsUsed, extraFields, REL_BUILDER.get());
    // pretend that one field is used.
    if (fieldsUsed.cardinality() == 0) {
        RelNode input = newTableAccessRel;
        if (input instanceof Project) {
            // The table has implemented the project in the obvious way - by
            // creating project with 0 fields. Strip it away, and create our own
            // project with one field.
            Project project = (Project) input;
            if (project.getRowType().getFieldCount() == 0) {
                input = project.getInput();
            }
        }
        return dummyProject(fieldCount, input);
    }
    final Mapping mapping = createMapping(fieldsUsed, fieldCount);
    return result(newTableAccessRel, mapping);
}

Example 63 with Project

use of org.apache.calcite.rel.core.Project in project hive by apache.

the class HiveJoinConstraintsRule method onMatch.

@Override
public void onMatch(RelOptRuleCall call) {
    final Project project = call.rel(0);
    final RexBuilder rexBuilder = project.getCluster().getRexBuilder();
    List<RexNode> topProjExprs = project.getProjects();
    Join join = call.rel(1);
    final JoinRelType joinType = join.getJoinType();
    final RelNode leftInput = join.getLeft();
    final RelNode rightInput = join.getRight();
    final RexNode cond = join.getCondition();
    // TODO:https://issues.apache.org/jira/browse/HIVE-23920
    if (joinType == JoinRelType.ANTI) {
        return;
    }
    // 1) If it is an inner, check whether project only uses columns from one side.
    // That side will need to be the FK side.
    // If it is a left outer, left will be the FK side.
    // If it is a right outer, right will be the FK side.
    final RelNode fkInput;
    final RelNode nonFkInput;
    final ImmutableBitSet topRefs = RelOptUtil.InputFinder.bits(topProjExprs, null);
    final ImmutableBitSet leftBits = ImmutableBitSet.range(leftInput.getRowType().getFieldCount());
    final ImmutableBitSet rightBits = ImmutableBitSet.range(leftInput.getRowType().getFieldCount(), join.getRowType().getFieldCount());
    // These boolean values represent corresponding left, right input which is potential FK
    boolean leftInputPotentialFK = topRefs.intersects(leftBits);
    boolean rightInputPotentialFK = topRefs.intersects(rightBits);
    if (leftInputPotentialFK && rightInputPotentialFK && (joinType == JoinRelType.INNER || joinType == JoinRelType.SEMI)) {
        // Both inputs are referenced. Before making a decision, try to swap
        // references in join condition if it is an inner join, i.e. if a join
        // condition column is referenced above the join, then we can just
        // reference the column from the other side.
        // For example, given two relations R(a1,a2), S(b1) :
        // SELECT a2, b1 FROM R, S ON R.a1=R.b1 =>
        // SELECT a2, a1 FROM R, S ON R.a1=R.b1
        int joinFieldCount = join.getRowType().getFieldCount();
        Mapping mappingLR = Mappings.create(MappingType.PARTIAL_FUNCTION, joinFieldCount, joinFieldCount);
        Mapping mappingRL = Mappings.create(MappingType.PARTIAL_FUNCTION, joinFieldCount, joinFieldCount);
        for (RexNode conj : RelOptUtil.conjunctions(cond)) {
            if (!conj.isA(SqlKind.EQUALS)) {
                continue;
            }
            RexCall eq = (RexCall) conj;
            RexNode op1 = eq.getOperands().get(0);
            RexNode op2 = eq.getOperands().get(1);
            if (op1 instanceof RexInputRef && op2 instanceof RexInputRef) {
                // Check references
                int ref1 = ((RexInputRef) op1).getIndex();
                int ref2 = ((RexInputRef) op2).getIndex();
                int leftRef = -1;
                int rightRef = -1;
                if (leftBits.get(ref1) && rightBits.get(ref2)) {
                    leftRef = ref1;
                    rightRef = ref2;
                } else if (rightBits.get(ref1) && leftBits.get(ref2)) {
                    leftRef = ref2;
                    rightRef = ref1;
                }
                if (leftRef != -1 && rightRef != -1) {
                    // as it is useless
                    if (mappingLR.getTargetOpt(leftRef) == -1) {
                        mappingLR.set(leftRef, rightRef);
                    }
                    if (mappingRL.getTargetOpt(rightRef) == -1) {
                        mappingRL.set(rightRef, leftRef);
                    }
                }
            }
        }
        if (mappingLR.size() != 0) {
            // First insert missing elements into the mapping as identity mappings
            for (int i = 0; i < joinFieldCount; i++) {
                if (mappingLR.getTargetOpt(i) == -1) {
                    mappingLR.set(i, i);
                }
                if (mappingRL.getTargetOpt(i) == -1) {
                    mappingRL.set(i, i);
                }
            }
            // Then, we start by trying to reference only left side in top projections
            List<RexNode> swappedTopProjExprs = topProjExprs.stream().map(projExpr -> projExpr.accept(new RexPermuteInputsShuttle(mappingRL, call.rel(1)))).collect(Collectors.toList());
            rightInputPotentialFK = RelOptUtil.InputFinder.bits(swappedTopProjExprs, null).intersects(rightBits);
            if (!rightInputPotentialFK) {
                topProjExprs = swappedTopProjExprs;
            } else {
                // If it did not work, we try to reference only right side in top projections
                swappedTopProjExprs = topProjExprs.stream().map(projExpr -> projExpr.accept(new RexPermuteInputsShuttle(mappingLR, call.rel(1)))).collect(Collectors.toList());
                leftInputPotentialFK = RelOptUtil.InputFinder.bits(swappedTopProjExprs, null).intersects(leftBits);
                if (!leftInputPotentialFK) {
                    topProjExprs = swappedTopProjExprs;
                }
            }
        }
    } else if (!leftInputPotentialFK && !rightInputPotentialFK) {
        // TODO: There are no references in the project operator above.
        // In this case, we should probably do two passes, one for
        // left as FK and one for right as FK, although it may be expensive.
        // Currently we only assume left as FK
        leftInputPotentialFK = true;
    }
    final Mode mode;
    switch(joinType) {
        case SEMI:
        case INNER:
            // case ANTI: //TODO:https://issues.apache.org/jira/browse/HIVE-23920
            if (leftInputPotentialFK && rightInputPotentialFK) {
                // and there is nothing to transform
                return;
            }
            fkInput = leftInputPotentialFK ? leftInput : rightInput;
            nonFkInput = leftInputPotentialFK ? rightInput : leftInput;
            mode = Mode.REMOVE;
            break;
        case LEFT:
            fkInput = leftInput;
            nonFkInput = rightInput;
            mode = leftInputPotentialFK && !rightInputPotentialFK ? Mode.REMOVE : Mode.TRANSFORM;
            break;
        case RIGHT:
            fkInput = rightInput;
            nonFkInput = leftInput;
            mode = !leftInputPotentialFK && rightInputPotentialFK ? Mode.REMOVE : Mode.TRANSFORM;
            break;
        default:
            // Other type, bail out
            return;
    }
    // 2) Check whether this join can be rewritten or removed
    RewritablePKFKJoinInfo r = HiveRelOptUtil.isRewritablePKFKJoin(join, fkInput, nonFkInput, call.getMetadataQuery());
    // 3) If it is the only condition, we can trigger the rewriting
    if (r.rewritable) {
        rewrite(mode, fkInput, nonFkInput, join, topProjExprs, call, project, r.nullableNodes);
    } else {
        // Possibly this could be enhanced to take other join type into consideration.
        if (joinType != JoinRelType.INNER) {
            return;
        }
        // first swap fk and non-fk input and see if we can rewrite them
        RewritablePKFKJoinInfo fkRemoval = HiveRelOptUtil.isRewritablePKFKJoin(join, nonFkInput, fkInput, call.getMetadataQuery());
        if (fkRemoval.rewritable) {
            // we have established that nonFkInput is FK, and fkInput is PK
            // and there is no row filtering on FK side
            // check that FK side join column is distinct (i.e. have a group by)
            ImmutableBitSet fkSideBitSet;
            if (nonFkInput == leftInput) {
                fkSideBitSet = leftBits;
            } else {
                fkSideBitSet = rightBits;
            }
            ImmutableBitSet.Builder fkJoinColBuilder = ImmutableBitSet.builder();
            for (RexNode conj : RelOptUtil.conjunctions(cond)) {
                if (!conj.isA(SqlKind.EQUALS)) {
                    return;
                }
                RexCall eq = (RexCall) conj;
                RexNode op1 = eq.getOperands().get(0);
                RexNode op2 = eq.getOperands().get(1);
                if (op1 instanceof RexInputRef && op2 instanceof RexInputRef) {
                    // Check references
                    int ref1 = ((RexInputRef) op1).getIndex();
                    int ref2 = ((RexInputRef) op2).getIndex();
                    int leftRef = -1;
                    int rightRef = -1;
                    if (fkSideBitSet.get(ref1)) {
                        // check that join columns are not nullable
                        if (op1.getType().isNullable()) {
                            return;
                        }
                        fkJoinColBuilder.set(fkSideBitSet.indexOf(ref1));
                    } else {
                        if (op2.getType().isNullable()) {
                            return;
                        }
                        fkJoinColBuilder.set(fkSideBitSet.indexOf(ref2));
                    }
                }
            }
            if (!call.getMetadataQuery().areColumnsUnique(nonFkInput, fkJoinColBuilder.build())) {
                return;
            }
            // all conditions are met, therefore we can perform rewrite to remove fk side
            rewrite(mode, fkInput, nonFkInput, join, topProjExprs, call, project, fkRemoval.nullableNodes);
        }
    }
}

Example 64 with Project

use of org.apache.calcite.rel.core.Project in project hive by apache.

the class HiveJoinToMultiJoinRule method onMatch.

// ~ Methods ----------------------------------------------------------------
@Override
public void onMatch(RelOptRuleCall call) {
    final HiveJoin join = call.rel(0);
    final RelNode left = call.rel(1);
    final RelNode right = call.rel(2);
    // 1. We try to merge this join with the left child
    RelNode multiJoin = mergeJoin(join, left, right);
    if (multiJoin != null) {
        call.transformTo(multiJoin);
        return;
    }
    // 2. If we cannot, we swap the inputs so we can try
    // to merge it with its right child
    RelNode swapped = JoinCommuteRule.swap(join, true);
    assert swapped != null;
    // The result of the swapping operation is either
    // i)  a Project or,
    // ii) if the project is trivial, a raw join
    final HiveJoin newJoin;
    Project topProject = null;
    if (swapped instanceof HiveJoin) {
        newJoin = (HiveJoin) swapped;
    } else {
        topProject = (Project) swapped;
        newJoin = (HiveJoin) swapped.getInput(0);
    }
    // 3. We try to merge the join with the right child
    multiJoin = mergeJoin(newJoin, right, left);
    if (multiJoin != null) {
        if (topProject != null) {
            multiJoin = projectFactory.createProject(multiJoin, Collections.emptyList(), topProject.getProjects(), topProject.getRowType().getFieldNames());
        }
        call.transformTo(multiJoin);
        return;
    }
}

Example 65 with Project

use of org.apache.calcite.rel.core.Project in project hive by apache.

the class HiveProjectFilterPullUpConstantsRule method onMatch.

public void onMatch(RelOptRuleCall call) {
    final Project project = call.rel(0);
    final Filter filter = call.rel(1);
    final RelBuilder builder = call.builder();
    List<RexNode> projects = project.getProjects();
    List<RexNode> newProjects = rewriteProjects(projects, filter.getCondition(), builder);
    if (newProjects == null) {
        return;
    }
    RelNode newProjRel = builder.push(filter).project(newProjects, project.getRowType().getFieldNames()).build();
    call.transformTo(newProjRel);
}