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https://issues.apache.org/jira/browse/SPARK-34251?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Apache Spark reassigned SPARK-34251:
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Assignee: Apache Spark
> TRUNCATE TABLE resets stats for non-empty v1 table
> --------------------------------------------------
>
> Key: SPARK-34251
> URL: https://issues.apache.org/jira/browse/SPARK-34251
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 3.0.2, 3.2.0, 3.1.1
> Reporter: Maxim Gekk
> Assignee: Apache Spark
> Priority: Major
>
> The example below portraits the issue:
> {code:sql}
> spark-sql> CREATE TABLE tbl (c0 int, part int) PARTITIONED BY (part);
> spark-sql> INSERT INTO tbl PARTITION (part=0) SELECT 0;
> spark-sql> INSERT INTO tbl PARTITION (part=1) SELECT 1;
> spark-sql> ANALYZE TABLE tbl COMPUTE STATISTICS;
> spark-sql> DESCRIBE TABLE EXTENDED tbl;
> ...
> Statistics 4 bytes, 2 rows
> ...
> {code}
> Let's truncate one partition:
> {code:sql}
> spark-sql> TRUNCATE TABLE tbl PARTITION (part=1);
> spark-sql> DESCRIBE TABLE EXTENDED tbl;
> ...
> Statistics 0 bytes, 0 rows
> ...
> spark-sql> SELECT * FROM tbl;
> 0 0
> {code}
> *The last query returns a row but stats show 0 rows. *
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