From 8bde797fe8d56980bd876e6e168fb546bc09ed75 Mon Sep 17 00:00:00 2001
From: Michael Kolupaev <michael.kolupaev@clickhouse.com>
Date: Fri, 19 Sep 2025 19:03:50 +0000
Subject: [PATCH] Merge pull request #87258 from ClickHouse/pq0

Fix 'Invalid dict indices bit width: 0' in parquet reader v3
---
 src/Processors/Formats/Impl/Parquet/Decoding.cpp | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/Processors/Formats/Impl/Parquet/Decoding.cpp b/src/Processors/Formats/Impl/Parquet/Decoding.cpp
index a3cfb47ee8f9..96cdd15c4a4d 100644
--- a/src/Processors/Formats/Impl/Parquet/Decoding.cpp
+++ b/src/Processors/Formats/Impl/Parquet/Decoding.cpp
@@ -41,7 +41,7 @@ struct BitPackedRLEDecoder : public PageDecoder
             requireRemainingBytes(1);
             bit_width = size_t(UInt8(*data));
             data += 1;
-            if (bit_width > 8 * sizeof(T) || (bit_width == 0 && limit > 1))
+            if (bit_width > 8 * sizeof(T))
                 throw Exception(ErrorCodes::INCORRECT_DATA, "Invalid dict indices bit width: {}", bit_width);
         }
         else
@@ -120,7 +120,7 @@ struct BitPackedRLEDecoder : public PageDecoder
     {
         if (bit_width == 0)
         {
-            /// bit_width == 0 can be used for dictionary indices if the dictionary has only one value.
+            /// bit_width == 0 means all values are 0.
             if constexpr (!skip)
                 memset(out, 0, num_values * sizeof(T));
             return;