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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