Fixing gaps for Containers with HashV1

[FabianMeiswinkel]

Description

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• The pull request does not introduce [breaking changes]
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Testing Guidelines

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[Copilot]

Pull Request Overview

This PR fills gaps for containers using HashV1 by adding missing V1 hashing utilities and ensuring the version field is passed when creating PartitionKey instances.

• Introduce 32-bit MurmurHash3 (murmurhash3_32), truncation logic, and V1-specific hashing in PartitionKey
• Propagate the new version argument in all PartitionKey constructor calls across container and client code
• Extend _cosmos_murmurhash3.py to export the 32-bit hash function

Reviewed Changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
sdk/cosmos/.../partition_key.py	Add _truncate_for_v1_hashing, _as_unsigned_long, V1 hash methods, import murmurhash3_32
sdk/cosmos/.../container.py	Pass version when instantiating PartitionKey
sdk/cosmos/.../aio/_cosmos_client_connection_async.py	Pass version in async client PartitionKey creation
sdk/cosmos/.../aio/_container.py	Pass version when creating PartitionKey in aio
sdk/cosmos/.../_cosmos_murmurhash3.py	Add murmurhash3_32 implementation
sdk/cosmos/.../_cosmos_client_connection.py	Pass version and adjust type annotation for pk_properties

Comments suppressed due to low confidence (2)

sdk/cosmos/azure-cosmos/azure/cosmos/partition_key.py:201

• New V1 hashing methods are introduced but there aren’t corresponding unit tests. Please add tests for _get_effective_partition_key_for_hash_partitioning and _truncate_for_v1_hashing to verify correct behavior.

def _get_effective_partition_key_for_hash_partitioning(

sdk/cosmos/azure-cosmos/azure/cosmos/_cosmos_client_connection.py:3124

• [nitpick] The variable pk_properties is annotated as Optional[PartitionKey] but it holds a dict of properties. Consider updating the type annotation to Dict[str, Any] or the correct schema type.

pk_properties: Optional[PartitionKey] = kwargs.pop("partitionKeyDefinition", None)

[Copilot]

The call to murmurhash3_32 uses len(bytes) instead of the actual buffer length. Replace len(bytes) with len(ms_bytes) to hash the correct number of bytes.

Suggested change

	hash_as_int: int = _murmurhash3_32(bytearray(ms_bytes),len(bytes), 0)
	hash_as_int: int = _murmurhash3_32(bytearray(ms_bytes), len(ms_bytes), 0)

[bambriz]

I'll go ahead and change this a bit, we can set the length variable inside _murmurhash3_32 based on the bytearray we passed in similar to the 128 murmurhash.

[simorenoh]

LGTM, thanks for the quick fix Fabian - will approve once we have tests added for it