[FLINK-15479] Override explainSource method in JDBCTableSource

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 1.9.0
• Fix Version/s: 1.10.0
• Component/s: Connectors / JDBC
• Labels: pull-request-available
• Assignee: hailong wang
• Reporter: hailong wang
• Created: 05/Jan/20 14:37
• Updated: 20/Jan/20 03:51
• Resolved: 19/Jan/20 03:55

Description

JDBCTableSource support project push down, when the final fieldNames is inconsistent with that in tableSchema, the source's explanation will be wrong. So we should override explainSource method for it.

Issue Links

• relates to: FLINK-15677 TableSource#explainSource should return the field names from getProducedDataType instead of getTableSchema
• links to: GitHub Pull Request #10769