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https://issues.apache.org/jira/browse/FLINK-12810?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16861819#comment-16861819
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Aljoscha Krettek commented on FLINK-12810:
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What is this issue about? Steps 1 - 4 seem to make sense but step 5 is
temporary and maybe doesn't make sense to have in the long run.
> Support to run a TableAPI query like 'table.select('a, 'b, 'c)'
> ---------------------------------------------------------------
>
> Key: FLINK-12810
> URL: https://issues.apache.org/jira/browse/FLINK-12810
> Project: Flink
> Issue Type: Task
> Reporter: Jing Zhang
> Priority: Major
> Labels: pull-request-available
> Time Spent: 10m
> Remaining Estimate: 0h
>
> Support to run a TableAPI query like 'table.select('a, 'b, 'c)', including:
> 1. add RexNodeConverter to convert Expression to RexNode
> 2. Introduce RexPlannerExpression to wraps a RexNode, which is similar to
> RexPlannerExpression in flink-planner module.
> 3. add QueryOperationConverter to convert QueryOperation tree to RelNode
> 4. Introduce PlannerQueryOperation to wraps a RelNode in QueryOperation,
> which is similar to PlannerQueryOperation in flink-planner module.
> 5. add OperationTreeBuilder and relative classes(ExpressionResolver,
> TableReferenceLookup, FieldReferenceLoopup, ExpandColumnFunctionsRule,
> LookupCallByNameRule, ResolverRule, StarReferenceFlattingRule,
> VerifyNoUnresolvedExpressionRule), which is almost copy from flink-planner
> module to blink-planner module, except that we remove dependency on
> PlannerExpression. **Note: This is temporal solution, since
> OperationTreeBuilder will be moved to api module finally.**
> 6. add implicit conversion in expressionDsl
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