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Merged
merged 2 commits into from
Oct 10, 2025
Merged

24.8.14 Backport of #87863: ArrowStream processing crash if non unique dictionary #1067

merged 2 commits into from
Oct 10, 2025

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@ilejn ilejn commented Oct 6, 2025 •
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Changelog category (leave one):

  • Bug Fix (user-visible misbehavior in an official stable release)

Changelog entry (a [user-readable short description]

ClickHouse crashes if ArrowStream file has non-unique dictionary (ClickHouse#87863 by @ilejn)

Documentation entry for user-facing changes

The issue was observed in prod environment (no ideas how data was created).
I've created sample file by the script

import pyarrow as pa
import pyarrow.ipc as ipc

# Example data
# dict_strings = ["apple", "banana", "cherry"]  # low cardinality dictionary
dict_strings = ["apple", "banana", "banana"]  # low cardinality dictionary
indices = [2]               # indexes into dict_strings

# Create Arrow arrays
# 1) Dictionary array for strings
dictionary_array = pa.array(dict_strings)

# 2) Indices array 
indices_array = pa.array(indices, type=pa.int32())

# Create dictionary-encoded array using the indices and dictionary
dict_encoded_array = pa.DictionaryArray.from_arrays(indices_array, dictionary_array)

table = pa.Table.from_arrays([dict_encoded_array], names=["col_str"])

# Write to Arrow Stream file
with pa.OSFile("output_unique.arrowstream", "wb") as sink:
    with ipc.RecordBatchStreamWriter(sink, table.schema) as writer:
        writer.write_table(table)

The point is 'banana' is duplicated.
ClickHouse creates LowCardinality column for two meaningful elements ('apple' and 'banana') and index '2' is out of bound.

Backtrace

025.09.20 13:27:23.707456 [ 1757039 ] {} <Fatal> ClientBase: 4. raise @ 0x000000000004527e
2025.09.20 13:27:23.707477 [ 1757039 ] {} <Fatal> ClientBase: 5. __GI_abort @ 0x00000000000288ff
2025.09.20 13:27:23.707506 [ 1757039 ] {} <Fatal> ClientBase: 6. _nl_load_domain.cold @ 0x000000000002881b
2025.09.20 13:27:23.707536 [ 1757039 ] {} <Fatal> ClientBase: 7. ? @ 0x000000000003b517
2025.09.20 13:27:23.720357 [ 1757039 ] {} <Fatal> ClientBase: 8.0. inlined from /home/ilejn/projects/ClickHouse/src/Common/PODArray.h:386: DB::PODArray<char8_t, 4096ul, Allocator<false, false>, 63ul, 64ul>::operator[](long) const
2025.09.20 13:27:23.720391 [ 1757039 ] {} <Fatal> ClientBase: 8.1. inlined from /home/ilejn/projects/ClickHouse/src/Columns/ColumnNullable.h:55: DB::ColumnNullable::isNullAt(unsigned long) const
2025.09.20 13:27:23.720404 [ 1757039 ] {} <Fatal> ClientBase: 8. /home/ilejn/projects/ClickHouse/src/DataTypes/Serializations/SerializationNullable.cpp:241: DB::SerializationNullable::serializeTextEscaped(DB::IColumn const&, unsigned long, DB::WriteBuffer&, DB::FormatSettings const&) const @ 0x000000001535e889
2025.09.20 13:27:23.730228 [ 1757039 ] {} <Fatal> ClientBase: 9. /home/ilejn/projects/ClickHouse/src/DataTypes/Serializations/SerializationLowCardinality.cpp:830: void DB::SerializationLowCardinality::serializeImpl<DB::WriteBuffer&, DB::FormatSettings const&, DB::WriteBuffer&, DB::FormatSettings const&>(DB::IColumn const&, unsigned long, void (DB::ISerialization::*)(DB::IColumn const&, unsigned long, DB::WriteBuffer&, DB::FormatSettings const&) const, DB::WriteBuffer&, DB::FormatSettings const&) const @ 0x0000000015354856
2025.09.20 13:27:23.739946 [ 1757039 ] {} <Fatal> ClientBase: 10. /home/ilejn/projects/ClickHouse/src/DataTypes/Serializations/SerializationLowCardinality.cpp:730: DB::SerializationLowCardinality::serializeTextEscaped(DB::IColumn const&, unsigned long, DB::WriteBuffer&, DB::FormatSettings const&) const @ 0x0000000015353e55
2025.09.20 13:27:23.747865 [ 1757039 ] {} <Fatal> ClientBase: 11. /home/ilejn/projects/ClickHouse/src/Processors/Formats/IRowOutputFormat.cpp:78: DB::IRowOutputFormat::write(std::vector<COW<DB::IColumn>::immutable_ptr<DB::IColumn>, std::allocator<COW<DB::IColumn>::immutable_ptr<DB::IColumn>>> const&, unsigned long) @ 0x0000000019eae5c4
2025.09.20 13:27:23.755135 [ 1757039 ] {} <Fatal> ClientBase: 12. /home/ilejn/projects/ClickHouse/src/Processors/Formats/IRowOutputFormat.cpp:31: DB::IRowOutputFormat::consume(DB::Chunk) @ 0x0000000019eae30c
2025.09.20 13:27:23.763541 [ 1757039 ] {} <Fatal> ClientBase: 13. /home/ilejn/projects/ClickHouse/src/Processors/Formats/IOutputFormat.cpp:153: DB::IOutputFormat::write(DB::Block const&) @ 0x0000000019ead3e3
2025.09.20 13:27:23.821999 [ 1757039 ] {} <Fatal> ClientBase: 14. /home/ilejn/projects/ClickHouse/src/Client/ClientBase.cpp:535: DB::ClientBase::onData(DB::Block&, std::shared_ptr<DB::IAST>) @ 0x0000000019c3abb1
2025.09.20 13:27:23.881718 [ 1757039 ] {} <Fatal> ClientBase: 15. /home/ilejn/projects/ClickHouse/src/Client/ClientBase.cpp:1395: DB::ClientBase::receiveAndProcessPacket(std::shared_ptr<DB::IAST>, bool) @ 0x0000000019c4374a
2025.09.20 13:27:23.931084 [ 1757039 ] {} <Fatal> ClientBase: 16. /home/ilejn/projects/ClickHouse/src/Client/ClientBase.cpp:1361: DB::ClientBase::receiveResult(std::shared_ptr<DB::IAST>, int, bool) @ 0x0000000019c42fe4
2025.09.20 13:27:23.974651 [ 1757039 ] {} <Fatal> ClientBase: 17. /home/ilejn/projects/ClickHouse/src/Client/ClientBase.cpp:1270: DB::ClientBase::processOrdinaryQuery(String, std::shared_ptr<DB::IAST>) @ 0x0000000019c41bfc

@Avogar @ilejn
Merge pull request ClickHouse#87863 from ilejn/non_uniq_arrow_dict
d61094c 
ArrowStream processing crash if non unique dictionary
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ilejn commented Oct 9, 2025

Attn @zvonand
As I can see there is no issues caused by this backport.

@zvonand zvonand changed the title Merge pull request #87863 from ilejn/non_uniq_arrow_dict 24.8.14 Backport of #87863: ArrowStream processing crash if non unique dictionary Oct 10, 2025
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zvonand commented Oct 10, 2025 •
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@ilejn I would like to ask you to create PRs with proper names and descriptions (see other backports)

Also, please, add necessary labels, so that the PR is easy to find in GitHub

@zvonand zvonand merged commit 73b4f3b into customizations/24.8.14 Oct 10, 2025
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@zvonand zvonand deleted the backports/24.8.14/87863 branch October 10, 2025 14:54
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ilejn commented Oct 10, 2025

@ilejn I would like to ask you to create PRs with proper names and descriptions (see other backports)

I've added the ending of the description, somehow disappeared.

@zvonand , could you provide a specific PR that is a good pattern and/or elaborate on what is wrong?

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ilejn commented Oct 10, 2025

Sorry for troubling anyway.

@zvonand zvonand mentioned this pull request Oct 16, 2025
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