feat: support Time/Time64 data types

[ernado]

Types are introduced in 25.6.

ClickHouse/ClickHouse#81217

[tosolveit]

Hi Aleksandr, I'd like to give this a try.

I've reviewed some of the older type-related commits, and I think I understand the pattern.

1. Create the type
2. Create the column type (satisfy interfaces)
3. Write the tests
4. Generate _gen files using the cmd/ch-gen-col/main.go
5. Run the tests

Let me know if there's anything specific you'd like me to keep in mind before I start, or if you’re already working on this.

Thanks!

[ernado]

Hey @tosolveit, I’m not working on this so you can pick this issue.
Will be happy to help and review.

Looks like implementation will be similar to DateTime/DateTime64 in some way.

Your plan looks ok, go ahead.

[tosolveit]

Hey,
I did couple of things to make it work, I'm having a problem when generating the _gen files:

Here is the summary:

1. Add new type variants to proto/cmd/ch-gen-col/main.go

		{ // Time32
			Bits:   32,
			Signed: true,
			Kind:   KindDateTime,
		},
		{ // Time64
			Bits:   64,
			Signed: false,
			Kind:   KindDateTime,
		}

2. Implement time32.go and time64.go types (time32 is clickhouse's Time type, I can rename it later)
3. Implement col_time32.go and col_time64.go

• Add new constants to the column.go

	ColumnTypeTime64   ColumnType = "Time64"
	ColumnTypeTime32   ColumnType = "Time32"

In the proto/cmd/ch-gen-col/main.go

• unsafe_gen will not be created because it is false for both types
• _gen will be skipped
• _safe_gen has to be created
• _gen_test has to be created

based on the logic below

	for _, v := range variants {
		if !v.Byte() {
			v.GenerateUnsafe = true
		}
		base := "col_" + v.ElemLower()
		if v.Kind == KindFixedStr {
			base = "col_fixedstr" + strconv.Itoa(v.Bytes())
		}
		if !v.DateTime() {
			if err := write(base+"_gen", v, tpl); err != nil {
				return errors.Wrap(err, "write")
			}
		}
		if err := write(base+"_safe_gen", v, tplSafe); err != nil {
			return errors.Wrap(err, "write")
		}
		if v.GenerateUnsafe {
			if err := write(base+"_unsafe_gen", v, tplUnsafe); err != nil {
				return errors.Wrap(err, "write")
			}
		}
		if err := write(base+"_gen_test", v, tplTest); err != nil {
			return errors.Wrap(err, "write test")
		}
	}

unfortunately when I run go run cmd/ch-gen-col/main.go I don't see the expected files, so maybe I'm missing something obvious, do you have any suggestions, thanks

[ernado]

I think you can try adding another kind like KindTime instead of KindDateTime and updating templates.

Also you can create WIP draft PR so we can already iterate over it.

[tosolveit]

@ernado I took some progress, I had to change the main.go and some tmpl files and while introducing Time64 & Time32 I noticed new bugs related to templates, I only committed the files that are related to Time64 & Time32 not the tmpl file changes, I need a few more days to fix those and finalize the PR.

[shivanshuraj1333]

@ernado kindly correct me if I am wrong,

to get gen files working for Time/Time64, the generator would need to support custom encode/decode logic for types that require conversion to/from Go’s time.Time.

and hence, I suggest we stick with a manual implementation for these types, just like we do for DateTime.

[tosolveit]

Hi @ernado
Generators support custom encode/decode for these types and I didn't push those changes yet, I made tmpl modifications that works for time64 and time32 , but I noticed that there are a few bugs, tomorrow I have time to sit and get rid of these bugs, once I'm confident with the templates I will finalize and push them.

Are we on the same page? Please correct me if my direction is not correct.

[shivanshuraj1333]

I wanted to wrap up ClickHouse/clickhouse-go#1596 and hence I started working on #1074 both the changes are complete and are open for reviews. Apologies @tosolveit but I wanted to wrap it up, if any of the changes gets merged in ch-go to support time and time64, it should be okay because then the support on the actual client can be tested.

@ernado please help reviewing my changes whenever you've time, this is my first time contributing to ch-go so I may have missed something.

thanks!