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https://issues.apache.org/jira/browse/FLINK-4068?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15529775#comment-15529775
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ASF GitHub Bot commented on FLINK-4068:
---------------------------------------
Github user twalthr commented on a diff in the pull request:
https://github.com/apache/flink/pull/2560#discussion_r80927113
--- Diff:
flink-libraries/flink-table/src/main/scala/org/apache/flink/api/table/BatchTableEnvironment.scala
---
@@ -228,19 +229,13 @@ abstract class BatchTableEnvironment(
}
/**
- * Translates a [[Table]] into a [[DataSet]].
- *
- * The transformation involves optimizing the relational expression
tree as defined by
+ * Generates the optimized [[RelNode]] tree from the relational
expression tree as defined by
* Table API calls and / or SQL queries and generating corresponding
[[DataSet]] operators.
--- End diff --
The method does not generate a `DataSet` operators. Can you also add that
it converts to DataSet/DataStream convertion?
> Move constant computations out of code-generated `flatMap` functions.
> ---------------------------------------------------------------------
>
> Key: FLINK-4068
> URL: https://issues.apache.org/jira/browse/FLINK-4068
> Project: Flink
> Issue Type: Improvement
> Components: Table API & SQL
> Affects Versions: 1.1.0
> Reporter: Fabian Hueske
> Assignee: Jark Wu
>
> The generated functions for expressions of the Table API or SQL include
> constant computations.
> For instance the code generated for a predicate like:
> {code}
> myInt < (10 + 20)
> {code}
> looks roughly like:
> {code}
> public void flatMap(Row in, Collector<Row> out) {
> Integer in1 = in.productElement(1);
> int temp = 10 + 20;
> if (in1 < temp) {
> out.collect(in)
> }
> }
> {code}
> In this example the computation of {{temp}} is constant and could be moved
> out of the {{flatMap()}} method.
> The same might apply for generated function other than {{FlatMap}} as well.
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