[FLINK-13075] Project pushdown rule shouldn't require the TableSource return a modified schema in blink planner

• Type: Bug
• Status: Resolved
• Priority: Blocker
• Resolution: Fixed
• Fix Version/s: 1.9.0
• Component/s: Table SQL / Planner
• Labels: pull-request-available
• Assignee: Caizhi Weng
• Reporter: Jark Wu
• Created: 03/Jul/19 10:31
• Updated: 01/Aug/19 13:58
• Resolved: 23/Jul/19 09:45

Description

As the javadoc of org.apache.flink.table.sources.ProjectableTableSource#projectFields said, the table schema of the TableSource copy must not be modified by this method. However, PushProjectIntoTableSourceScanRule in blink planner requires the returning a table source with the modified table schema. This conflict with the javadoc and result in the TableSource works for flink planner can't work for blink planner.

Issue Links

• duplicates: FLINK-13348 ProjectableTableSource is not supported by blink-planner correctly
• is a child of: FLINK-13285 Check connectors runnable in blink runner
• links to: GitHub Pull Request #9197