[SPARK-29074] Optimize `date_format` for foldable `fmt`

• Type: Improvement
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 3.0.0
• Fix Version/s: 3.0.0
• Component/s: SQL
• Assignee: Max Gekk
• Reporter: Max Gekk
• Created: 13/Sep/19 09:41
• Updated: 12/Dec/22 18:10
• Resolved: 17/Sep/19 07:00

Description

The DateFormatClass (https://github.com/apache/spark/blob/67b4329fb08fd606461aa1ac9274c4a84d15d70e/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/datetimeExpressions.scala#L583) could create the TimestampFormatter only once at the initialization, and reuse it in nullSafeEval() and in doGenCode().

Issue Links

• links to: GitHub Pull Request #25782