Examples with FlatProductInputType org.apache.calcite.runtime.SqlFunctions.FlatProductInputType used on opensource projects

Example 1 with FlatProductInputType

use of org.apache.calcite.runtime.SqlFunctions.FlatProductInputType in project calcite by apache.

the class EnumerableUncollect method implement.

public Result implement(EnumerableRelImplementor implementor, Prefer pref) {
    final BlockBuilder builder = new BlockBuilder();
    final EnumerableRel child = (EnumerableRel) getInput();
    final Result result = implementor.visitChild(this, 0, child, pref);
    final PhysType physType = PhysTypeImpl.of(implementor.getTypeFactory(), getRowType(), JavaRowFormat.LIST);
    // final Enumerable<List<Employee>> child = <<child adapter>>;
    // return child.selectMany(FLAT_PRODUCT);
    final Expression child_ = builder.append("child", result.block);
    final List<Integer> fieldCounts = new ArrayList<>();
    final List<FlatProductInputType> inputTypes = new ArrayList<>();
    for (RelDataTypeField field : child.getRowType().getFieldList()) {
        final RelDataType type = field.getType();
        if (type instanceof MapSqlType) {
            fieldCounts.add(2);
            inputTypes.add(FlatProductInputType.MAP);
        } else {
            final RelDataType elementType = type.getComponentType();
            if (elementType.isStruct()) {
                fieldCounts.add(elementType.getFieldCount());
                inputTypes.add(FlatProductInputType.LIST);
            } else {
                fieldCounts.add(-1);
                inputTypes.add(FlatProductInputType.SCALAR);
            }
        }
    }
    final Expression lambda = Expressions.call(BuiltInMethod.FLAT_PRODUCT.method, Expressions.constant(Ints.toArray(fieldCounts)), Expressions.constant(withOrdinality), Expressions.constant(inputTypes.toArray(new FlatProductInputType[inputTypes.size()])));
    builder.add(Expressions.return_(null, Expressions.call(child_, BuiltInMethod.SELECT_MANY.method, lambda)));
    return implementor.result(physType, builder.toBlock());
}