[SPARK-19092] Save() API of DataFrameWriter should not scan all the saved files

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.1.0
• Fix Version/s: 2.1.1, 2.2.0
• Component/s: SQL
• Assignee: Xiao Li
• Reporter: Xiao Li
• Created: 06/Jan/17 00:06
• Updated: 16/Jan/17 02:58
• Resolved: 13/Jan/17 17:27

Description

`DataFrameWriter`'s save() API is performing a unnecessary full filesystem scan for the saved files. The save() API is the most basic/core API in `DataFrameWriter`. We should avoid these unnecessary file scan.

Issue Links

• links to: [Github] Pull Request #16481 (gatorsmile)
• links to: [Github] Pull Request #16588 (gatorsmile)