[jira] [Created] (FLINK-18548) Improve FlinkCalcMergeRule to merge calc nodes better

[Shang Yuanchun (Jira)]

Leonard Xu created FLINK-18548:
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             Summary: Improve FlinkCalcMergeRule to merge calc nodes better
                 Key: FLINK-18548
                 URL: https://issues.apache.org/jira/browse/FLINK-18548
             Project: Flink
          Issue Type: Improvement
          Components: Table SQL / Planner
    Affects Versions: 1.12.0
            Reporter: Leonard Xu


FlinkCalcMergeRule should merge calc nodes when outer calc do not contains inner calc's fields, the following logical plan can not merge as expected currently:
{code:java}
FlinkLogicalJoin(condition=[AND(=($0, $4), >($1, 1))], joinType=[left])
      :- FlinkLogicalCalc(select=[id, len, content], where=[>(id, 1)])
      :  +- FlinkLogicalTableSourceScan(table=[[default_catalog, default_database, T]], fields=[id, len, content])
      +- FlinkLogicalSnapshot(period=[$cor0.proctime])
         +- FlinkLogicalCalc(select=[age, id, name], where=[AND(>(age, 20), =(name, _UTF-16LE'Fabian':VARCHAR(2147483647) CHARACTER SET "UTF-16LE"))])
            +- FlinkLogicalCalc(select=[age, id, name, PROCTIME() AS proctime])
               +- FlinkLogicalTableSourceScan(table=[[default_catalog, default_database, userTable]], fields=[age, id, name])
{code}
The corresponding SQL to reproduce this issue:
{code:java}
 CREATE TABLE userTable (
       `id` BIGINT,
       `len` BIGINT,
       `content` STRING,
       `proctime` AS PROCTIME()
       ) WITH (
       'connector' = 'values',
       'data-id' = '$dataId',
       'bounded' = 'true'
 )

SELECT T.id, T.len, T.content, D.name FROM T JOIN userTable " +
  "for system_time as of T.proctime AS D ON T.id = D.id

{code}
 



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