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https://issues.apache.org/jira/browse/CALCITE-3230?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16900816#comment-16900816
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Danny Chan commented on CALCITE-3230:
-------------------------------------
Can you paste a test case here, i tried
{code:java}
@Test public void testExplicitCastOfAggNotApplied() {
final HepProgram program = new HepProgramBuilder()
.addRuleInstance(ReduceExpressionsRule.PROJECT_INSTANCE)
.addRuleInstance(ReduceExpressionsRule.FILTER_INSTANCE)
.addRuleInstance(ReduceExpressionsRule.JOIN_INSTANCE)
.build();
final String sql = "select cast(avg(cast(sal as double)) as float)\n"
+ "from emp\n"
+ "group by ename";
checkPlanning(new HepPlanner(program), sql);
}
{code}
in RelOptRules.java but does not reproduce this. The avg(double_column) return
type is double, cast(double as float) should not be recognized as redundant.
> Explicit CASTs by user are not applied.
> ---------------------------------------
>
> Key: CALCITE-3230
> URL: https://issues.apache.org/jira/browse/CALCITE-3230
> Project: Calcite
> Issue Type: Bug
> Components: core
> Reporter: Pressenna
> Priority: Major
>
> For some reason casting is not working correctly with aggregate functions.
> for example:
> {code:java}
> SELECT CAST(AVG(double_column) AS float) FROM foo GROUP BY group_coulmn;
> {code}
> does not apply the cast. We currently have to circumvent this by using
> following dummy construct.
> {code:java}
> SELECT CAST( (AVG(double_column) + 0.0) AS float) FROM foo GROUP BY
> group_coulmn;
> {code}
>
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