NullPointerException and regression in BeamCalcRel

    Schema schema =
        Schema.builder()
            .addNullableField("f0", Schema.FieldType.BOOLEAN)
            .build();

    String sql =
        "SELECT SUM(case when coalesce(f0, true) = true then 1 else 0 end) " +
        "FROM PCOLLECTION";

    List<Row> rows = ImmutableList.of(
        Row.withSchema(schema).addValue(false).build(),
        Row.withSchema(schema).addValue(true).build(),
        Row.withSchema(schema).addValue(null).build());

    PCollection<Row> input = pipeline.apply("rows", Create.of(rows).withRowSchema(schema));

    PAssert.that(input.apply(SqlTransform.query(sql))).satisfies(matchesScalar(2));

    pipeline.run();

    Schema schema =
        Schema.builder()
            .addNullableField("f0", Schema.FieldType.BOOLEAN)
            .build();

    String sql =
        "SELECT SUM(case when coalesce(f0, false) = true then 1 else 0 end) " +
        "FROM PCOLLECTION";

    List<Row> rows = ImmutableList.of(
        Row.withSchema(schema).addValue(false).build(),
        Row.withSchema(schema).addValue(true).build(),
        Row.withSchema(schema).addValue(null).build());

    PCollection<Row> input = pipeline.apply("rows", Create.of(rows).withRowSchema(schema));

    PAssert.that(input.apply(SqlTransform.query(sql))).satisfies(matchesScalar(1));

    pipeline.run();