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From "ASF GitHub Bot (Jira)" <>
Subject [jira] [Work logged] (HIVE-23959) Provide an option to wipe out column stats for partitioned tables in case of column removal
Date Tue, 04 Aug 2020 07:22:00 GMT


ASF GitHub Bot logged work on HIVE-23959:

                Author: ASF GitHub Bot
            Created on: 04/Aug/20 07:21
            Start Date: 04/Aug/20 07:21
    Worklog Time Spent: 10m 
      Work Description: pvary commented on a change in pull request #1341:

File path: standalone-metastore/metastore-common/src/main/java/org/apache/hadoop/hive/metastore/conf/
@@ -1352,6 +1352,12 @@ public static ConfVars getMetaConf(String name) {
             "If both this and the metastore.dbaccess.ssl.* properties are set, then the latter
properties \n" +
             "will overwrite what was set in the deprecated property."),
+    COLSTATS_RETAIN_ON_COLUMN_REMOVAL("metastore.colstats.retain.on.column.removal",
+        "hive.metastore.colstats.retain.on.column.removal", true,
+        "Wether to retain column statistics during column removals in partitioned tables
- disabling this "

Review comment:
       nit: Whether?

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Issue Time Tracking

    Worklog Id:     (was: 466075)
    Time Spent: 1h 20m  (was: 1h 10m)

> Provide an option to wipe out column stats for partitioned tables in case of column removal
> -------------------------------------------------------------------------------------------
>                 Key: HIVE-23959
>                 URL:
>             Project: Hive
>          Issue Type: Improvement
>            Reporter: Zoltan Haindrich
>            Assignee: Zoltan Haindrich
>            Priority: Major
>              Labels: pull-request-available
>          Time Spent: 1h 20m
>  Remaining Estimate: 0h
> in case of column removal / replacement - an update for each partition is neccessary;
which could take a while.
> goal here is to provide an option to switch to the bulk removal of column statistics
instead of working hard to retain as much as possible from the old stats.

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