[jira] [Created] (SPARK-38140) Column stats (min, max) for timestamp type is not consistent with the value due to time zone difference

["Zhenhua Wang (Jira)" <ji...@apache.org>]

Zhenhua Wang created SPARK-38140:
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             Summary: Column stats (min, max) for timestamp type is not consistent with the value due to time zone difference
                 Key: SPARK-38140
                 URL: https://issues.apache.org/jira/browse/SPARK-38140
             Project: Spark
          Issue Type: Bug
          Components: SQL
    Affects Versions: 3.2.1, 3.1.2
            Reporter: Zhenhua Wang


Currently timestamp column's stats (min/max) are stored in UTC in metastore, and when desc its min/max column stats, they are also shown in UTC.

As a result, for users not in UTC, the column stats are not consistent with the actual value, which causes confusion.

For example:
spark-sql> create table tab_ts_master (ts timestamp) using parquet;
spark-sql> insert into tab_ts_master values make_timestamp(2022, 1, 1, 0, 0, 1.123456), make_timestamp(2022, 1, 3, 0, 0, 2.987654);
spark-sql> select * from tab_ts_master;
2022-01-01 00:00:01.123456
2022-01-03 00:00:02.987654
spark-sql> set spark.sql.session.timeZone;
spark.sql.session.timeZone	Asia/Shanghai
spark-sql> analyze table tab_ts_master compute statistics for all columns;
spark-sql> desc formatted tab_ts_master ts;
col_name	ts
data_type	timestamp
comment	NULL
min	2021-12-31 16:00:01.123456
max	2022-01-02 16:00:02.987654
num_nulls	0
distinct_count	2
avg_col_len	8
max_col_len	8
histogram	NULL




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