Fix parquet reader list bug (#17699)

This fixes a bug in the parquet list reader, where if a row had a list so long that it spanned a whole page, we would skip reading the page entirely.

Authors:
  - Paul Mattione (https://github.com/pmattione-nvidia)

Approvers:
  - https://github.com/nvdbaranec
  - Bradley Dice (https://github.com/bdice)
  - Vyas Ramasubramani (https://github.com/vyasr)

URL: #17699

cpp/src/io/parquet/decode_fixed.cu

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2024, NVIDIA CORPORATION.
+ * Copyright (c) 2024-2025, NVIDIA CORPORATION.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -961,9 +961,6 @@ CUDF_KERNEL void __launch_bounds__(decode_block_size_t, 8)
     return;
   }
 
-  // if we have no work to do (eg, in a skip_rows/num_rows case) in this page.
-  if (s->num_rows == 0) { return; }
-
   using value_decoder_type = std::conditional_t<
     split_decode_t,
     decode_fixed_width_split_values_func<decode_block_size_t, has_lists_t, state_buf_t>,