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https://issues.apache.org/jira/browse/FLINK-8950?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Aljoscha Krettek updated FLINK-8950:
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Component/s: (was: Table SQL / API)
Table SQL / Legacy Planner
> "Materialize" Tables to avoid recomputation.
> --------------------------------------------
>
> Key: FLINK-8950
> URL: https://issues.apache.org/jira/browse/FLINK-8950
> Project: Flink
> Issue Type: New Feature
> Components: Table SQL / Legacy Planner
> Affects Versions: 1.5.0
> Reporter: Fabian Hueske
> Priority: Major
>
> Currently, {{Table}} objects of the Table API / SQL are treated like virtual
> views, i.e., all relational operators that have been applied on them are
> recorded and translated when a {{Table}} is emitted to a {{TableSink}} or
> converted into a {{DataSet}} or {{DataStream}}.
> In case a {{Table}} is accessed twice, the (sub-)query that it represents is
> translated twice into a {{DataSet}} or {{DataStream}} program and hence also
> executed twice which is inefficient. Currently, the only way to avoid this is
> to convert the {{Table}} into a {{DataSet}} or {{DataStream}}, which will
> cause the optimizer to generate a plan and register it back as a new
> {{Table}}.
> We should offer a method to internally "materialize" a {{Table}} object,
> i.e., to optimize, generate a plan, and register the plan as an internal
> table. All queries / operations that are evaluated on the materialized
> {{Table}} will start from the same {{DataSet}} or {{DataStream}} such that it
> is not computed multiple times.
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