Kent Yao created SPARK-31867:
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Summary: Fix silent data change for datetime formatting
Key: SPARK-31867
URL: https://issues.apache.org/jira/browse/SPARK-31867
Project: Spark
Issue Type: Bug
Components: SQL
Affects Versions: 3.0.0, 3.1.0
Reporter: Kent Yao
{code:java}
spark-sql> select from_unixtime(1, 'yyyyyyyyyyy-MM-dd');
NULL
spark-sql> set spark.sql.legacy.timeParserPolicy=legacy;
spark.sql.legacy.timeParserPolicy legacy
spark-sql> select from_unixtime(1, 'yyyyyyyyyyy-MM-dd');
00000001970-01-01
spark-sql>
{code}
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