Implement ENTRIES function

[2-NOW]

resolve #1290

[coveralls]

Pull Request Test Coverage Report for Build 5670676976

• 41 of 45 (91.11%) changed or added relevant lines in 5 files are covered.
• 28 unchanged lines in 2 files lost coverage.
• Overall coverage decreased (-0.04%) to 98.571%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
test-suite/src/function/entries.rs	18	22	81.82%

Files with Coverage Reduction	New Missed Lines	%
core/src/ast/mod.rs	1	99.83%
core/src/executor/aggregate/mod.rs	27	86.08%

Totals
Change from base Build 5658500467:	-0.04%
Covered Lines:	46230
Relevant Lines:	46900

---

💛 - Coveralls

[zmrdltl]

only one test left!
https://coveralls.io/builds/61509376/source?filename=core%2Fsrc%2Fexecutor%2Fevaluate%2Ffunction.rs#L775

we can write this test like this

test!(
        "SELECT UNWRAP('abc', 'a.b.c') FROM MapType",
       Err(EvaluateError::FunctionRequiresMapValue("UNWRAP".to_owned()).into())
);

[2-NOW]

thanks for the feedback. i've applied it :)

[zmrdltl]

we can use r# operator to remove '' for readable code

r#"INSERT INTO Item VALUES ('{"name":"GlueSQL"}')"#,

[2-NOW]

thanks for the feedback. i've applied it :)

[panarch]

Looks all nice! Thanks a lot for the contribution 👍 👍

[panarch]

this removal does not look intentional which is not related to this pr.

[2-NOW]

I fixed :)

associated commit: 7d2eeb8

[panarch]

Looks all nice! Thanks a lot for the contribution 👍 👍