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https://issues.apache.org/jira/browse/CALCITE-6714?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17902931#comment-17902931
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Aleksey Plekhanov commented on CALCITE-6714:
--------------------------------------------
The whole expression is converted to {{RexLiteral}} with numeric value 1.000000
by {{StandardConvertletTable.convertCast}} without multiplying to interval time
unit multiplier, since outer cast argument is not {{SqlNumericLiteral}}, but
another cast. Value has type {{DECIMAL}} with scale 6 (1.000000), scale is
inherited from {{DEFAULT_INTERVAL_FRACTIONAL_SECOND_PRECISION}}. In
{{RexToLixTranslator.translateLiteral}} value of interval literal is calculated
using expression {{value2 = literal.getValueAs(Long.class)}}, this expression
transforms {{BigDecimal}} value using {{clazz.cast(((BigDecimal)
value).unscaledValue().longValue())}} and for for 1.000000 returns 1000000
(milliseconds) = 16.666 minutes.
> Cast literal to interval gives the wrong result if literal is casted
> --------------------------------------------------------------------
>
> Key: CALCITE-6714
> URL: https://issues.apache.org/jira/browse/CALCITE-6714
> Project: Calcite
> Issue Type: Bug
> Reporter: Aleksey Plekhanov
> Assignee: Aleksey Plekhanov
> Priority: Major
>
> Expression:
> {noformat}
> cast(cast(1 as integer) as interval minute)
> {noformat}
> Returns 17 minutes instead of 1 minute.
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