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https://issues.apache.org/jira/browse/CALCITE-4958?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17475931#comment-17475931
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hujiahua commented on CALCITE-4958:
-----------------------------------
[~julianhyde] I had refine the subject, thanks. And I thought of an
optimization idea: converting IN-list to RexCall instead of Join (Think of it
as an SQL function, and refer to the processing method of LIKE expression).
> Poor performance execute plan when use dynamic parameters in IN-list clause
> ---------------------------------------------------------------------------
>
> Key: CALCITE-4958
> URL: https://issues.apache.org/jira/browse/CALCITE-4958
> Project: Calcite
> Issue Type: Bug
> Reporter: hujiahua
> Priority: Minor
>
> When we using IN-list predicate in where clause and setting the
> DEFAULT_IN_SUB_QUERY_THRESHOLD less than the IN-list elements size, IN-list
> predicate will converted to Join. And also using dynamic parameters in a
> VALUES clause, I found each dynamic parameter converted to a LogicalValues
> (e.g. "x IN (?, ?, ... ?)"). Too many dynamic parameters will lead to poor
> performance.
> Here is my test: // I set DEFAULT_IN_SUB_QUERY_THRESHOLD = 2
> {code:java}
> final String sql = "select * from \"TEST\".\"DEPTS\" where \"NAME\" in
> ( ?, ?, ?)";
> final PreparedStatement statement2 =
> calciteConnection.prepareStatement(sql);
> statement2.setString(1, "Sales");
> statement2.setString(2, "Sales2");
> statement2.setString(3, "Sales3");
> final ResultSet resultSet1 = statement2.executeQuery();{code}
> Then Logical plan will like this:
> {noformat}
> LogicalProject(DEPTNO=[$0], NAME=[$1])
> LogicalJoin(condition=[=($1, $2)], joinType=[inner])
> LogicalTableScan(table=[[TEST, DEPTS]])
> LogicalAggregate(group=[{0}])
> LogicalUnion(all=[true])
> LogicalProject(EXPR$0=[?0])
> LogicalValues(tuples=[[{ 0 }]])
> LogicalProject(EXPR$0=[?1])
> LogicalValues(tuples=[[{ 0 }]])
> LogicalProject(EXPR$0=[?2])
> LogicalValues(tuples=[[{ 0 }]])
> {noformat}
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