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ASF GitHub Bot commented on FLINK-7636:
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twalthr commented on issue #4681: [FLINK-7636] [table] Introduce Flink
RelOptTable, and remove tableSource from all TableSourceScan node constructor
URL: https://github.com/apache/flink/pull/4681#issuecomment-439435170
@fhueske what is your opinion on this PR? The contributor @beyond1920 has
not responded to your question. Can we close this PR for now?
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> Introduce Flink RelOptTable, and remove tableSource from all TableSourceScan
> node constructor
> ----------------------------------------------------------------------------------------------
>
> Key: FLINK-7636
> URL: https://issues.apache.org/jira/browse/FLINK-7636
> Project: Flink
> Issue Type: Improvement
> Components: Table API & SQL
> Reporter: jingzhang
> Assignee: jingzhang
> Priority: Major
> Labels: pull-request-available
>
> At present, there are two ways to fetch TableSource of a TableSourceScan node
> (e.g LogicalTableSourceScan, PhysicalTableSourceScan ...):
> 1.
> {code}
> val relOptTable: RelOptTable = getTable()
> val tableSourceTable = relOptTable.unwrap(classOf[TableSourceTable[_]])
> val tableSouce = tableSourceTable.tableSource
> {code}
> the result of getTable() is instance of RelOptTableImpl now, and it will not
> change after RelNode tree is built.
> 2. now all TableSourceScan contains a tablesource as constructor parameter,
> so we could fetch the tablesource directly later.
>
> The result tableSource is different with each other by above two ways after
> apply project push(PPD) down or filter push down(FPD). It is very confusing.
> we hope to fix the problem by introducing FlinkRelOptTable to replace
> RelOptTableImpl, and remove tableSource parameter from TableSourceScan's
> constructor. After PPD or FPD, a new FlinkRelOptTable instance which
> contains a new TableSourceTable will be passed to TableSourceScan
> constructor.
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