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

Example 11 with Project

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

the class RelToSqlConverter method visit.

/**
 * @see #dispatch
 */
public Result visit(Filter e) {
    final RelNode input = e.getInput();
    Result x = visitChild(0, input);
    parseCorrelTable(e, x);
    if (input instanceof Aggregate) {
        final Builder builder;
        if (((Aggregate) input).getInput() instanceof Project) {
            builder = x.builder(e);
            builder.clauses.add(Clause.HAVING);
        } else {
            builder = x.builder(e, Clause.HAVING);
        }
        builder.setHaving(builder.context.toSql(null, e.getCondition()));
        return builder.result();
    } else {
        final Builder builder = x.builder(e, Clause.WHERE);
        builder.setWhere(builder.context.toSql(null, e.getCondition()));
        return builder.result();
    }
}

Example 12 with Project

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

the class SqlToRelConverter method translateIn.

private RexNode translateIn(RelOptUtil.Logic logic, RelNode root, final RexNode rex) {
    switch(logic) {
        case TRUE:
            return rexBuilder.makeLiteral(true);
        case TRUE_FALSE:
        case UNKNOWN_AS_FALSE:
            assert rex instanceof RexRangeRef;
            final int fieldCount = rex.getType().getFieldCount();
            RexNode rexNode = rexBuilder.makeFieldAccess(rex, fieldCount - 1);
            rexNode = rexBuilder.makeCall(SqlStdOperatorTable.IS_TRUE, rexNode);
            // Then append the IS NOT NULL(leftKeysForIn).
            // 
            // RexRangeRef contains the following fields:
            // leftKeysForIn,
            // rightKeysForIn (the original sub-query select list),
            // nullIndicator
            // 
            // The first two lists contain the same number of fields.
            final int k = (fieldCount - 1) / 2;
            for (int i = 0; i < k; i++) {
                rexNode = rexBuilder.makeCall(SqlStdOperatorTable.AND, rexNode, rexBuilder.makeCall(SqlStdOperatorTable.IS_NOT_NULL, rexBuilder.makeFieldAccess(rex, i)));
            }
            return rexNode;
        case TRUE_FALSE_UNKNOWN:
        case UNKNOWN_AS_TRUE:
            // select e.deptno,
            // case
            // when ct.c = 0 then false
            // when dt.i is not null then true
            // when e.deptno is null then null
            // when ct.ck < ct.c then null
            // else false
            // end
            // from e
            // cross join (select count(*) as c, count(deptno) as ck from v) as ct
            // left join (select distinct deptno, true as i from v) as dt
            // on e.deptno = dt.deptno
            final Join join = (Join) root;
            final Project left = (Project) join.getLeft();
            final RelNode leftLeft = ((Join) left.getInput()).getLeft();
            final int leftLeftCount = leftLeft.getRowType().getFieldCount();
            final RelDataType longType = typeFactory.createSqlType(SqlTypeName.BIGINT);
            final RexNode cRef = rexBuilder.makeInputRef(root, leftLeftCount);
            final RexNode ckRef = rexBuilder.makeInputRef(root, leftLeftCount + 1);
            final RexNode iRef = rexBuilder.makeInputRef(root, root.getRowType().getFieldCount() - 1);
            final RexLiteral zero = rexBuilder.makeExactLiteral(BigDecimal.ZERO, longType);
            final RexLiteral trueLiteral = rexBuilder.makeLiteral(true);
            final RexLiteral falseLiteral = rexBuilder.makeLiteral(false);
            final RexNode unknownLiteral = rexBuilder.makeNullLiteral(trueLiteral.getType());
            final ImmutableList.Builder<RexNode> args = ImmutableList.builder();
            args.add(rexBuilder.makeCall(SqlStdOperatorTable.EQUALS, cRef, zero), falseLiteral, rexBuilder.makeCall(SqlStdOperatorTable.IS_NOT_NULL, iRef), trueLiteral);
            final JoinInfo joinInfo = join.analyzeCondition();
            for (int leftKey : joinInfo.leftKeys) {
                final RexNode kRef = rexBuilder.makeInputRef(root, leftKey);
                args.add(rexBuilder.makeCall(SqlStdOperatorTable.IS_NULL, kRef), unknownLiteral);
            }
            args.add(rexBuilder.makeCall(SqlStdOperatorTable.LESS_THAN, ckRef, cRef), unknownLiteral, falseLiteral);
            return rexBuilder.makeCall(SqlStdOperatorTable.CASE, args.build());
        default:
            throw new AssertionError(logic);
    }
}

Example 13 with Project

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

the class RelBuilder method sortLimit.

/**
 * Creates a {@link Sort} by a list of expressions, with limit and offset.
 *
 * @param offset Number of rows to skip; non-positive means don't skip any
 * @param fetch Maximum number of rows to fetch; negative means no limit
 * @param nodes Sort expressions
 */
public RelBuilder sortLimit(int offset, int fetch, Iterable<? extends RexNode> nodes) {
    final List<RelFieldCollation> fieldCollations = new ArrayList<>();
    final List<RexNode> originalExtraNodes = fields();
    final List<RexNode> extraNodes = new ArrayList<>(originalExtraNodes);
    for (RexNode node : nodes) {
        final RelFieldCollation collation = collation(node, RelFieldCollation.Direction.ASCENDING, null, extraNodes);
        if (!RelCollations.ordinals(fieldCollations).contains(collation.getFieldIndex())) {
            fieldCollations.add(collation);
        }
    }
    final RexNode offsetNode = offset <= 0 ? null : literal(offset);
    final RexNode fetchNode = fetch < 0 ? null : literal(fetch);
    if (offsetNode == null && fetch == 0) {
        return empty();
    }
    if (offsetNode == null && fetchNode == null && fieldCollations.isEmpty()) {
        // sort is trivial
        return this;
    }
    final boolean addedFields = extraNodes.size() > originalExtraNodes.size();
    if (fieldCollations.isEmpty()) {
        assert !addedFields;
        RelNode top = peek();
        if (top instanceof Sort) {
            final Sort sort2 = (Sort) top;
            if (sort2.offset == null && sort2.fetch == null) {
                replaceTop(sort2.getInput());
                final RelNode sort = sortFactory.createSort(peek(), sort2.collation, offsetNode, fetchNode);
                replaceTop(sort);
                return this;
            }
        }
        if (top instanceof Project) {
            final Project project = (Project) top;
            if (project.getInput() instanceof Sort) {
                final Sort sort2 = (Sort) project.getInput();
                if (sort2.offset == null && sort2.fetch == null) {
                    final RelNode sort = sortFactory.createSort(sort2.getInput(), sort2.collation, offsetNode, fetchNode);
                    replaceTop(projectFactory.createProject(sort, project.getProjects(), Pair.right(project.getNamedProjects())));
                    return this;
                }
            }
        }
    }
    if (addedFields) {
        project(extraNodes);
    }
    final RelNode sort = sortFactory.createSort(peek(), RelCollations.of(fieldCollations), offsetNode, fetchNode);
    replaceTop(sort);
    if (addedFields) {
        project(originalExtraNodes);
    }
    return this;
}

Example 14 with Project

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

the class RelBuilder method projectNamed.

/**
 * Creates a {@link org.apache.calcite.rel.core.Project} of the given
 * expressions and field names, and optionally optimizing.
 *
 * <p>If {@code fieldNames} is null, or if a particular entry in
 * {@code fieldNames} is null, derives field names from the input
 * expressions.
 *
 * <p>If {@code force} is false,
 * and the input is a {@code Project},
 * and the expressions  make the trivial projection ($0, $1, ...),
 * modifies the input.
 *
 * @param nodes       Expressions
 * @param fieldNames  Suggested field names, or null to generate
 * @param force       Whether to create a renaming Project if the
 *                    projections are trivial
 */
public RelBuilder projectNamed(Iterable<? extends RexNode> nodes, Iterable<String> fieldNames, boolean force) {
    @SuppressWarnings("unchecked") final List<? extends RexNode> nodeList = nodes instanceof List ? (List) nodes : ImmutableList.copyOf(nodes);
    final List<String> fieldNameList = fieldNames == null ? null : fieldNames instanceof List ? (List<String>) fieldNames : ImmutableNullableList.copyOf(fieldNames);
    final RelNode input = peek();
    final RelDataType rowType = RexUtil.createStructType(cluster.getTypeFactory(), nodeList, fieldNameList, SqlValidatorUtil.F_SUGGESTER);
    if (!force && RexUtil.isIdentity(nodeList, input.getRowType())) {
        if (input instanceof Project && fieldNames != null) {
            // Rename columns of child projection if desired field names are given.
            final Frame frame = stack.pop();
            final Project childProject = (Project) frame.rel;
            final Project newInput = childProject.copy(childProject.getTraitSet(), childProject.getInput(), childProject.getProjects(), rowType);
            stack.push(new Frame(newInput, frame.fields));
        }
    } else {
        project(nodeList, rowType.getFieldNames(), force);
    }
    return this;
}

Example 15 with Project

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

the class RelFieldTrimmer method trimFields.

/**
 * Variant of {@link #trimFields(RelNode, ImmutableBitSet, Set)} for
 * {@link org.apache.calcite.rel.logical.LogicalTableScan}.
 */
public TrimResult trimFields(final TableScan tableAccessRel, ImmutableBitSet fieldsUsed, Set<RelDataTypeField> extraFields) {
    final int fieldCount = tableAccessRel.getRowType().getFieldCount();
    if (fieldsUsed.equals(ImmutableBitSet.range(fieldCount)) && extraFields.isEmpty()) {
        // then no need to introduce another RelNode
        return trimFields((RelNode) tableAccessRel, fieldsUsed, extraFields);
    }
    final RelNode newTableAccessRel = tableAccessRel.project(fieldsUsed, extraFields, relBuilder);
    // 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);
}