Github user sunjincheng121 commented on a diff in the pull request: https://github.com/apache/flink/pull/4012#discussion_r119071180 --- Diff: docs/dev/table/common.md --- @@ -98,374 +89,767 @@ env.execute("Your Query") </div> </div> +**Note:** Table API and SQL queries can be easily integrated with and embedded into DataStream or DataSet programs. Have a look a the [Integration with DataStream and DataSet API](#integration-with-datastream-and-dataset-api) section to learn how DataStreams and DataSets can be converted into Tables and vice versa. + {% top %} Create a TableEnvironment ------------------------- -A `Table` is always bound to a specific `TableEnvironment`. It is not possible to combine Tables of different TableEnvironments. +The `TableEnvironment` is a central concept of the Table API and SQL integration. It is responsible for: +* Registering a `Table` in the internal catalog +* Registering an external catalog +* Executing SQL queries +* Registering a user-defined (scalar, table, or aggregation) function +* Converting a `DataStream` or `DataSet` into a `Table` +* Holding a reference to an `ExecutionEnvironment` or `StreamExecutionEnvironment` + +A `Table` is always bound to a specific `TableEnvironment`. It is not process tables of different TableEnvironments in the same query, e.g., to join or union them. + +A `TableEnvironment` is created by calling the static `TableEnvironment.getTableEnvironment()` method with a `StreamExecutionEnvironment` or an `ExecutionEnvironment` and an optional `TableConfig`. The `TableConfig` can be used to configure the `TableEnvironment` or to customize the query optimization and translation process (see [Query Optimization](#query-optimization)). -**TODO: Extend** +<div class="codetabs" markdown="1"> +<div data-lang="java" markdown="1"> +{% highlight java %} +// *************** +// STREAMING QUERY +// *************** --- End diff -- Do we need uniform annotation style? In this doc sometime use `// For batch programs ...` sometime use ``` // *************** // STREAMING QUERY // *************** ``` When user see the doc will feeling a bit strange. What do you think?
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