TF::TensorListLengthOp op, OpAdaptor adaptor,
      ConversionPatternRewriter &rewriter) const override {
    Location loc = op.getLoc();
    Value input_handle = adaptor.getOperands()[0];

    BoolAttr true_attr = rewriter.getBoolAttr(true);
    auto shape = rewriter.create<TF::ShapeOp>(loc, input_handle,
                                              /*use_32bit=*/true_attr);
    rewriter.replaceOpWithNewOp<TF::GatherOp>(