[jira] [Created] (SPARK-55243) Allow binary headers in the Scala Spark Connect client

["Robert Dillitz (Jira)" <ji...@apache.org>]

Robert Dillitz created SPARK-55243:
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             Summary: Allow binary headers in the Scala Spark Connect client
                 Key: SPARK-55243
                 URL: https://issues.apache.org/jira/browse/SPARK-55243
             Project: Spark
          Issue Type: Improvement
          Components: Connect
    Affects Versions: 4.1.1
            Reporter: Robert Dillitz
             Fix For: 4.1.2, 4.2


The Scala Spark Connect client currently only allows setting ASCII headers and fails if one tries to set a (binary) header with {{-bin}} key suffix:

{code:java}
[info]   java.lang.IllegalArgumentException: ASCII header is named test-bin.  Only binary headers may end with -bin
[info]   at com.google.common.base.Preconditions.checkArgument(Preconditions.java:445)
[info]   at io.grpc.Metadata$AsciiKey.<init>(Metadata.java:972)
[info]   at io.grpc.Metadata$AsciiKey.<init>(Metadata.java:966)
[info]   at io.grpc.Metadata$Key.of(Metadata.java:708)
[info]   at io.grpc.Metadata$Key.of(Metadata.java:704)
[info]   at org.apache.spark.sql.connect.client.SparkConnectClient$MetadataHeaderClientInterceptor$$anon$2.$anonfun$start$1(SparkConnectClient.scala:1112)
[info]   at org.apache.spark.sql.connect.client.SparkConnectClient$MetadataHeaderClientInterceptor$$anon$2.$anonfun$start$1$adapted(SparkConnectClient.scala:1106)
[info]   at scala.collection.immutable.Map$Map1.foreach(Map.scala:278)
[info]   at org.apache.spark.sql.connect.client.SparkConnectClient$MetadataHeaderClientInterceptor$$anon$2.start(SparkConnectClient.scala:1106)
[info]   at io.grpc.stub.ClientCalls.startCall(ClientCalls.java:435)
{code}

Improvement: Automatically use {{Metadata.BINARY_BYTE_MARSHALLER}} for {{-bin}} keys, assuming base64 encoded value strings in the Scala Spark Connect client.



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