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Comment: fix/add links & minor edits for hive.log.explain.output & hive.server2.webui.explain.output

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When enabled, will log EXPLAIN EXTENDED output for the query at log4j INFO level and in HiveServer2 WebUI / Drilldown / Query Plan.

From Hive 3.1.0 onwards, this config configuration property only logs to the log4j INFO. To log the EXPLAIN  EXTENDED output EXTENDED output in WebUI / Drilldown / Query Plan from Hive 3.1.0 onwards, use hive.server2.webui.explain.output. 

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 hive.server2.webui.explain.output
  • Default Value: false
  • Added in: Hive 3.1.0 with HIVE-18469

The  The EXPLAIN EXTENDED output for the query will be shown in the WebUI / Drilldown / Query Plan tab when this configuration property is set to true.

Prior to Hive 3.1.0, you can use hive.log.explain.output instead of this configuration property.

Spark

Apache Spark was added in Hive 1.1.0 (HIVE-7292 and the merge-to-trunk JIRA's HIVE-9257, 9352, 9448). For information see the design document Hive on Spark and Hive on Spark: Getting Started.

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