godfrey he created FLINK-13081:
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Summary: Supports explain and execute DAG plan
Key: FLINK-13081
URL: https://issues.apache.org/jira/browse/FLINK-13081
Project: Flink
Issue Type: New Feature
Components: Table SQL / Planner
Reporter: godfrey he
Assignee: godfrey he
in flink planner, a query will be optimized while calling
{{TableEnvironment#insertInto}} or {{TableEnvironment#sqlUpdate}}. however, if
a job has multiple sinks (means {{insertInto}} or {{sqlUpdate}} will be called
multiple times), the final job contains several independent sub-graphs. In most
cases, there is duplicate computing in a multiple sinks job. so in blink
planner, multiple sinks queries will be optimized together to avoid duplicate
computing. a query will not be optimized in {{insertInto}} and {{sqlUpdate}}.
instead, queries will be optimized before executing.
this issue aims to support above case.
two methods will be added into {{TableEnvironment}}:
{code:java}
// explain multiple-sinks plan
String explain(boolean extended);
// Triggers the program execution
// in blink planner, queries will be optimized together in this method
JobExecutionResult execute(String jobName) throws Exception;
{code}
to make sure the behavior of flink planner is same as before, a
{{isLazyOptMode}} filed is added into {{EnvironmentSettings}}, which tell the
table environment should optimize the query immediately in
{{insertInto}}/{{sqlUpdate}} methods(isLazyOptMode=false) for flink planner or
in execute method for blink planner.
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