Shengkai Fang created FLINK-19639:
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Summary: Support SupportsNestedProjectionPushDown in planner
Key: FLINK-19639
URL: https://issues.apache.org/jira/browse/FLINK-19639
Project: Flink
Issue Type: New Feature
Components: Table SQL / Planner
Reporter: Shengkai Fang
Support to push nested projection into {{TableSourceScan}}. But it may cause
name conflicts in some situaion. For example, we create table with ddl
{code:sql}
CREATE TABLE NestedTable (
nest1 ROW<a INT>,
nest2 ROW<a INT>
)
{code}
and with query
{code:sql}
SELECT nest1.a, nest2.a from NestedTable
{code}
and we will get 2 {{`a`}} in the new schema when pushing projection.
Here we use {{'_'}} to concatenate the names of all levels as the name of the
nested fields. In this example, we will get fields {{nest1_a, nest2_a}} in the
new schema.
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