zhengruifeng commented on PR #40607:
URL: https://github.com/apache/spark/pull/40607#issuecomment-1495768111
```
pyspark.errors.exceptions.connect.SparkConnectGrpcException:
<_MultiThreadedRendezvous of RPC that terminated with:
status = StatusCode.UNKNOWN
details = "Java heap space"
debug_error_string = "UNKNOWN:Error received from peer
ipv4:127.0.0.1:39429 {grpc_message:"Java heap space", grpc_status:2,
created_time:"2023-04-04T10:54:38.384319228+00:00"}"
>
```
it fails again even I switch back to the initial approach, the error is
raised in the server side, so should not be related to the way to concat. I
guess there is no enough RAM.
cc @HyukjinKwon are those UTs tested in parallel or one by one?
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