[SPARK-25469] Eval methods of Concat, Reverse and ElementAt should use pattern matching only once

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.4.0, 3.0.0
• Fix Version/s: 2.4.0
• Component/s: SQL
• Assignee: Marek Novotny
• Reporter: Marek Novotny
• Created: 19/Sep/18 17:41
• Updated: 21/Sep/18 09:39
• Resolved: 21/Sep/18 09:39

Description

Pattern matching is utilized for each call of Concat.eval, Reverse.nullSafeEval and ElementAt.nullSafeEval and thus for each record of a dataset. This could lead to a performance penalty when expression are executed in the interpreted mode. The goal of this ticket is to reduce usage of pattern matching within the mentioned "eval" methods.

Issue Links

• is duplicated by: SPARK-25470 Eval method of Concat expression should call pattern matching only once
• relates to: SPARK-23736 High-order function: concat(array1, array2, ..., arrayN) → array
• links to: [Github] Pull Request #22471 (mn-mikke)
• links to: [Github] Pull Request #22471 (mn-mikke)