[Bug] Unexpected exception: org.apache.doris.analysis.CastExpr cannot be cast to org.apache.doris.analysis.LiteralExpr

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Describe the bug

ERROR 1064 (HY000): errCode = 2, detailMessage = Unexpected exception: org.apache.doris.analysis.CastExpr cannot be cast to org.apache.doris.analysis.LiteralExpr

To Reproduce

CREATE DATABASE IF NOT EXISTS `test`; USE `test`;
CREATE TABLE `test_t` (
  `dt` bigint(20) NULL,
  `id` bigint(20) NULL,
  `name` varchar(100) NULL
) ENGINE=OLAP
DUPLICATE KEY(`dt`, `id`, `name`)
PARTITION BY RANGE(`dt`) (
PARTITION p20201001 VALUES [("19700101"), ("20201001")),
PARTITION p20201002 VALUES [("20201001"), ("20201002")),
PARTITION p20201003 VALUES [("20201002"), ("20201003")),
PARTITION p20201004 VALUES [("20201003"), ("20201004")),
PARTITION p20201005 VALUES [("20201004"), ("20201005")),
PARTITION p20201006 VALUES [("20201005"), ("20201006")),
PARTITION p20201007 VALUES [("20201006"), ("20201007")),
PARTITION p20201008 VALUES [("20201007"), ("20201008")),
PARTITION p20201009 VALUES [("20201008"), ("20201009")),
PARTITION p20201010 VALUES [("20201009"), ("20201010")),
PARTITION p20201011 VALUES [("20201010"), ("20201011")),
PARTITION p20201012 VALUES [("20201011"), ("20201012")),
PARTITION p20201013 VALUES [("20201012"), ("20201013")),
PARTITION p20201014 VALUES [("20201013"), ("20201014")),
PARTITION p20201015 VALUES [("20201014"), ("20201015")),
PARTITION p20201016 VALUES [("20201015"), ("20201016")),
PARTITION p20201017 VALUES [("20201016"), ("20201017")),
PARTITION p20201018 VALUES [("20201017"), ("20201018")),
PARTITION p20201019 VALUES [("20201018"), ("20201019")),
PARTITION p20201020 VALUES [("20201019"), ("20201020")),
PARTITION p20201021 VALUES [("20201020"), ("20201021")),
PARTITION p20201022 VALUES [("20201021"), ("20201022")),
PARTITION p20201023 VALUES [("20201022"), ("20201023")),
PARTITION p20201024 VALUES [("20201023"), ("20201024")),
PARTITION p20201025 VALUES [("20201024"), ("20201025")),
PARTITION p20201026 VALUES [("20201025"), ("20201026")),
PARTITION p20201027 VALUES [("20201026"), ("20201027")),
PARTITION p20201028 VALUES [("20201027"), ("20201028")),
PARTITION p20201029 VALUES [("20201028"), ("20201029")),
PARTITION p20201030 VALUES [("20201029"), ("20201030")),
PARTITION p20201031 VALUES [("20201030"), ("20201031")))
DISTRIBUTED BY HASH(`id`) BUCKETS 5
PROPERTIES (
"replication_num" = "1",
"in_memory" = "false",
"storage_format" = "DEFAULT"
);

SELECT *
FROM `test`.`test_t`
WHERE `dt` >= 20200801
and `dt` < 20201101
AND `id` = 1
AND `name` = 'x'
AND substr(`dt`, 7, 8) in ('09')
;

Expected behavior
Here key.castTo(destType) returns CastExpr
https://github.com/apache/incubator-doris/blob/b1c1ffda4a0d5ff2f0be4f9d2f25997a31537ea8/fe/fe-core/src/main/java/org/apache/doris/catalog/PartitionKey.java#L135-L150
Maybe should call getResultValue()
Does anyone have other advice?