[Bug] unnecessary cast will be added on children in CaseExpr sometimes

[morrySnow]

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• I had searched in the issues and found no similar issues.

Version

master

What's Wrong?

Unnecessary cast will be added on CaseExpr's children when do analyze on it sometimes.
This results in unequal results being returned when comparing two equal cast expressions.

What You Expected?

Do not add unnecessary cast on its children

How to Reproduce?

• Create 2 tables

CREATE TABLE tbl1(k1 INT, v1 INT) DISTRIBUTED BY hash(k1) PROPERTIES("replication_num" = "1");
CREATE TABLE tbl2(k2 INT, v2 INT) DISTRIBUTED BY hash(k2) PROPERTIES("replication_num" = "1");

• restart fe
• execute query

SELECT
  k1,
  sum(CASE WHEN v2 < 10 THEN v1 ELSE 0 END) s
FROM
  tbl1,
  tbl2
GROUP BY
  k1;

query analyzed failed and return

select list expression not produced by aggregation output (missing from GROUP BY clause?): ...

Anything Else?

No response

Are you willing to submit PR?

• Yes I am willing to submit a PR!

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