Maxim Gekk created SPARK-32006:
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Summary: Create date/timestamp formatters once before collect in
`hiveResultString()`
Key: SPARK-32006
URL: https://issues.apache.org/jira/browse/SPARK-32006
Project: Spark
Issue Type: Bug
Components: SQL
Affects Versions: 3.0.1, 3.1.0
Reporter: Maxim Gekk
Spark 2.4 re-uses one instance of SimpleDateFormat while formatting timestamps
in toHiveString. Currently, toHiveString() creates timestampFormatter per each
value. Even w/ caching, it causes additional overhead comparing to Spark 2.4.
The ticket aims to create an instance of TimestampFormatter before collect in
hiveResultString()
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