[FLINK-5224] Improve UDTF: emit rows directly instead of buffering them

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 1.2.0
• Component/s: Table SQL / API
• Assignee: Jark Wu
• Reporter: Jark Wu
• Created: 02/Dec/16 03:11
• Updated: 26/Jan/17 10:09
• Resolved: 26/Jan/17 09:52

Description

This needs to code generate a `Collector` and register it into instance of TableFunction, and emit the rows generated by the UDTF directly instead of buffering them.

Issue Links

• is blocked by: FLINK-4469 Add support for user defined table function in Table API & SQL
• links to: GitHub Pull Request #3118