[HIVE-21245] Make hive.fetch.output.serde Default to LazySimpleSerde

• Type: Improvement
• Status: Patch Available
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: 3.2.0, 4.0.0
• Component/s: Serializers/Deserializers
• Assignee: David Mollitor
• Reporter: David Mollitor
• Created: 11/Feb/19 21:31
• Updated: 21/Oct/22 07:31

Description

For all intents and purposes, it already is:

HiveSessionImpl.java

  private static final String FETCH_WORK_SERDE_CLASS =
      "org.apache.hadoop.hive.serde2.lazy.LazySimpleSerDe";

  @Override
  public HiveConf getHiveConf() {
    sessionConf.setVar(HiveConf.ConfVars.HIVEFETCHOUTPUTSERDE, FETCH_WORK_SERDE_CLASS);
    return sessionConf;
  }

https://github.com/apache/hive/blob/master/service/src/java/org/apache/hive/service/cli/session/HiveSessionImpl.java#L489-L492

The current default is:

    // Serde for FetchTask
    HIVEFETCHOUTPUTSERDE("hive.fetch.output.serde", "org.apache.hadoop.hive.serde2.DelimitedJSONSerDe",
        "The SerDe used by FetchTask to serialize the fetch output."),

Ultimately, I'd like to get rid of org.apache.hadoop.hive.serde2.DelimitedJSONSerDe altogether. It's a weird thing.