refactor(function): cast timestamp to variant string instead of variant int

[andylokandy]

I hereby agree to the terms of the CLA available at: https://databend.rs/dev/policies/cla/

Summary

  ast            : CAST(to_timestamp(1000000) AS VARIANT)
  raw expr       : CAST(to_timestamp(1000000_u32) AS Variant)
  checked expr   : CAST(to_timestamp<Int64>(CAST(1000000_u32 AS Int64)) AS Variant)
- optimized expr : 0x200000002000000940000000e8d4a51000
+ optimized expr : 0x200000001000001a313937302d30312d31322031333a34363a34302e303030303030
  output type    : Variant
  output domain  : Undefined
- output         : 1000000000000
+ output         : "1970-01-12 13:46:40.000000"

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1 Ignored Deployment

Name	Status	Preview	Updated
databend	⬜️ Ignored (Inspect)		Nov 1, 2022 at 11:20AM (UTC)

[RinChanNOWWW]

Why change &Tz to Tz?

[Xuanwo]

Why change &Tz to Tz?

Tz is Copy?