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Posted to issues@spark.apache.org by "Kaicheng Zhou (Jira)" <ji...@apache.org> on 2026/10/19 18:16:00 UTC

[jira] [Created] (SPARK-60354) FieldDescriptor.label is being deprecated

Kaicheng Zhou created SPARK-60354:
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             Summary: FieldDescriptor.label is being deprecated
                 Key: SPARK-60354
                 URL: https://issues.apache.org/jira/browse/SPARK-60354
             Project: Spark
          Issue Type: Bug
          Components: Connect
    Affects Versions: 5.0.0, 4.4.0
            Reporter: Kaicheng Zhou


protobuf 7.34 removed {{FieldDescriptor.label}} (deprecated since 6.32 in favor of {{{}is_repeated{}}}). The latest {{grpcio-status}} and {{googleapis-common-protos}} allow {{{}protobuf<8{}}}, so a fresh PySpark Connect client install now gets protobuf 7.
{{SparkConnectClient._truncate}} in {{python/pyspark/sql/connect/client/core.py}} checks {{{}descriptor.label == descriptor.LABEL_REPEATED{}}}. On protobuf 7 it raises {{{}AttributeError{}}}, which {{_proto_to_string}} catches, so every "Executing plan" / "Schema for plan" / "Explain" debug log shows {{<Truncated message due to truncation error>}} instead of the plan. On protobuf 6.32–6.33 the same code emits a {{{}DeprecationWarning{}}}.
 
Fix: use {{{}descriptor.is_repeated{}}}, available since protobuf 6.31.0. PySpark already requires {{{}grpcio-status>=1.76.0{}}}, which needs {{{}protobuf>=6.31.1{}}}.



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