[SPARK-23627] Provide isEmpty() function in DataSet

• Type: Improvement
• Status: Resolved
• Priority: Trivial
• Resolution: Fixed
• Affects Version/s: 2.1.0
• Fix Version/s: 2.4.0
• Component/s: Spark Core, SQL
• Assignee: Goun Na
• Reporter: Goun Na
• Created: 08/Mar/18 07:31
• Updated: 12/Dec/22 18:10
• Resolved: 15/May/18 06:11

Description

Like rdd.isEmpty, adding isEmpty to DataSet would useful. 

Some code without isEmpty:

if (df.count = 0) { do_something }

 Some people add limit 1 for a performance reason:

if (df.limit(1).rdd.isEmpty) { do_something }
if (df.rdd.take(1).isEmpty) { do_something }

 

If isEmpty is provided, the code will be perfect clean:

if (df.isEmpty)  { do_something }

 

 

 

 

 

 

 

 

Issue Links

• links to: [Github] Pull Request #20782 (goungoun)
• links to: [Github] Pull Request #20800 (goungoun)
• links to: Stack Overflow - Fastest way to check if DataFrame(Scala) is empty?