[Feature] create new functions such as current_timestamp, current_date

[shshenhua]

…amp funcation

like spark and presto

What type of PR is this：

• Feature

Which issues of this PR fixes ：

Fixes
#15382
#15285

Problem Summary(Required) ：

Checklist:

• I have added test cases for my bug fix or my new feature
• This pr will affect users' behaviors
• This pr needs user documentation (for new or modified features or behaviors)
  • I have added documentation for my new feature or new function

Bugfix cherry-pick branch check:

• I have checked the version labels which the pr will be auto backported to target branch
  • 2.5
  • 2.4
  • 2.3
  • 2.2

[shshenhua]

spark and presto can execute
select current_date() , select current_date
select current_timestamp() , select current_timestamp
select current_time() , select current_time
select localtimestamp(), select localtimestamp
select localtime(), select localtime

but starrocks only execute such as
select current_date()
select current_timestamp()
select current_time()
select localtimestamp()
select localtime()

so enhance functions like spark and presto， now we can execute
select current_date
select current_timestamp
select current_time
select localtimestamp
select localtime

[Astralidea]

better add UT

[murphyatwork]

run starrocks_fe_unittest

[shshenhua]

run starrocks_admit_test

[HangyuanLiu]

Can unify CURRENT_TIMESTAMP and specialDateTimeExpression together

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
1 Code Smell

0.0% Coverage
0.0% Duplication

[wanpengfei-git]

[FE PR Coverage Check]

😍 pass : 3 / 3 (100.00%)

file detail

	path	covered_line	new_line	coverage	not_covered_line_detail
🔵	com/starrocks/sql/parser/AstBuilder.java	3	3	100.00%	[]

[wanpengfei-git]

run starrocks_admit_test

[Astralidea]

@Mergifyio backport branch-2.5

[mergify]

backport branch-2.5

✅ Backports have been created

• #15634 [Feature] create new functions such as current_timestamp, current_date (backport #14319) has been created for branch branch-2.5