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https://issues.apache.org/jira/browse/BEAM-8365?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Kirill Kozlov updated BEAM-8365:
--------------------------------
    Description: 
* InMemoryTable should implement a following method:
{code:java}
public PCollection<Row> buildIOReader(
    PBegin begin, BeamSqlTableFilter filters, List<String> fieldNames);{code}
Which should return a `PCollection` with fields specified in `fieldNames` list.

 * Create a rule to push fields used by a Calc (in projects and in a condition) 
down into TestTable IO.
 * Updating that same Calc  (from previous step) to have a proper input and 
output schemes, remove unused fields.

  was:
* InMemoryTable should implement a following method:
{code:java}
public PCollection<Row> buildIOReader(
    PBegin begin, BeamSqlTableFilter filters, List<String> fieldNames);{code}
Which should return a `PCollection` with fields specified in `fieldNames` list.

 * Add a property "push_down" to TestTableProvider, which should allow user to 
select version of InMemoryProvider to use: with project push-down, with 
predicate push-down (will be implemented later), both (will be implemented 
later), or without (default).
 * Create a rule to push fields used by a Calc (in projects and in a condition) 
down into TestTable IO.
 * Updating that same Calc  (from previous step) to have a proper input and 
output schemes, remove unused fields.


> Add project push-down capability to IO APIs
> -------------------------------------------
>
>                 Key: BEAM-8365
>                 URL: https://issues.apache.org/jira/browse/BEAM-8365
>             Project: Beam
>          Issue Type: New Feature
>          Components: dsl-sql
>            Reporter: Kirill Kozlov
>            Assignee: Kirill Kozlov
>            Priority: Minor
>          Time Spent: 1h
>  Remaining Estimate: 0h
>
> * InMemoryTable should implement a following method:
> {code:java}
> public PCollection<Row> buildIOReader(
>     PBegin begin, BeamSqlTableFilter filters, List<String> fieldNames);{code}
> Which should return a `PCollection` with fields specified in `fieldNames` 
> list.
>  * Create a rule to push fields used by a Calc (in projects and in a 
> condition) down into TestTable IO.
>  * Updating that same Calc  (from previous step) to have a proper input and 
> output schemes, remove unused fields.



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