Optimize Date/Date32 scan

[ShoshinNikita]

Summary

• Get year, month, day via a single call to time.Time.Date and hour, minute, seconds via time.Time.Clock. This change eliminates multiple calls to time.Time.date and time.Time.abs.
• Don't allocate new time.Time if desired location is UTC.

Benchmark results of getTimeWithDifferentLocation:

name                             old time/op    new time/op    delta
GetTimeWithDifferentLocation-32    32.8ns ± 3%    17.4ns ± 3%  -46.83%  (p=0.000 n=10+10)

name                             old alloc/op   new alloc/op   delta
GetTimeWithDifferentLocation-32     0.00B          0.00B          ~     (all equal)

name                             old allocs/op  new allocs/op  delta
GetTimeWithDifferentLocation-32      0.00           0.00          ~     (all equal)

Raw benchmark results

Old version

// "old" version
func getTimeWithDifferentLocation(t time.Time, loc *time.Location) time.Time {
	return time.Date(t.Year(), t.Month(), t.Day(), t.Hour(), t.Minute(), t.Second(), t.Nanosecond(), loc)
}

goos: linux
goarch: amd64
pkg: github.com/ClickHouse/clickhouse-go/v2/lib/column
cpu: 13th Gen Intel(R) Core(TM) i9-13900HX
BenchmarkGetTimeWithDifferentLocation
BenchmarkGetTimeWithDifferentLocation-32    	36481345	        33.37 ns/op	       0 B/op	       0 allocs/op
BenchmarkGetTimeWithDifferentLocation-32    	33599790	        32.63 ns/op	       0 B/op	       0 allocs/op
BenchmarkGetTimeWithDifferentLocation-32    	38609709	        33.81 ns/op	       0 B/op	       0 allocs/op
BenchmarkGetTimeWithDifferentLocation-32    	37585620	        32.85 ns/op	       0 B/op	       0 allocs/op
BenchmarkGetTimeWithDifferentLocation-32    	38654622	        32.43 ns/op	       0 B/op	       0 allocs/op
BenchmarkGetTimeWithDifferentLocation-32    	37217412	        33.23 ns/op	       0 B/op	       0 allocs/op
BenchmarkGetTimeWithDifferentLocation-32    	34944349	        32.15 ns/op	       0 B/op	       0 allocs/op
BenchmarkGetTimeWithDifferentLocation-32    	37236122	        32.88 ns/op	       0 B/op	       0 allocs/op
BenchmarkGetTimeWithDifferentLocation-32    	38284749	        32.53 ns/op	       0 B/op	       0 allocs/op
BenchmarkGetTimeWithDifferentLocation-32    	36064225	        32.32 ns/op	       0 B/op	       0 allocs/op
PASS
ok  	github.com/ClickHouse/clickhouse-go/v2/lib/column	12.454s

Optimized version

goos: linux
goarch: amd64
pkg: github.com/ClickHouse/clickhouse-go/v2/lib/column
cpu: 13th Gen Intel(R) Core(TM) i9-13900HX
BenchmarkGetTimeWithDifferentLocation
BenchmarkGetTimeWithDifferentLocation-32    	73176572	        17.92 ns/op	       0 B/op	       0 allocs/op
BenchmarkGetTimeWithDifferentLocation-32    	63622671	        17.43 ns/op	       0 B/op	       0 allocs/op
BenchmarkGetTimeWithDifferentLocation-32    	73126280	        17.48 ns/op	       0 B/op	       0 allocs/op
BenchmarkGetTimeWithDifferentLocation-32    	69986809	        17.41 ns/op	       0 B/op	       0 allocs/op
BenchmarkGetTimeWithDifferentLocation-32    	69220406	        17.56 ns/op	       0 B/op	       0 allocs/op
BenchmarkGetTimeWithDifferentLocation-32    	70910238	        17.39 ns/op	       0 B/op	       0 allocs/op
BenchmarkGetTimeWithDifferentLocation-32    	71086362	        17.63 ns/op	       0 B/op	       0 allocs/op
BenchmarkGetTimeWithDifferentLocation-32    	72798584	        17.16 ns/op	       0 B/op	       0 allocs/op
BenchmarkGetTimeWithDifferentLocation-32    	68707909	        17.33 ns/op	       0 B/op	       0 allocs/op
BenchmarkGetTimeWithDifferentLocation-32    	65608513	        17.19 ns/op	       0 B/op	       0 allocs/op
PASS
ok  	github.com/ClickHouse/clickhouse-go/v2/lib/column	12.387s

Checklist

Delete items not relevant to your PR:

• Unit and integration tests covering the common scenarios were added
• A human-readable description of the changes was provided to include in CHANGELOG

[CLAassistant]

All committers have signed the CLA.

[jkaflik]

LGTM. Thanks for your contribution!