Revive VRL function changes

[binarylogic]

It appears that #6353 dropped changes like #6052. We should audit and revive any changes like this that were dropped.

[pablosichert]

Relevant PRs to be reviewed:

• enhancement(remap): Add length function for VRL #6088
• feat(remap): improve test harness set-up #6105
• fix(remap): Update VRL docs URLs #6120
• chore(ci): Fix remap benches #6124
• enhancement(remap transform): add get_hostname function #6141
• chore: Update Remap function examples #6143
• chore(remap): Improve Remap return documentation #6160
• enhancement(remap): maintain type definitions for maps #6182
• chore(external docs): Switch conditions docs from check_fields to remap #6183
• chore: Add more remap examples for remap conditions #6219
• fix(remap): fix field sublocation_type in parse_aws_vpc_flow_log #6229
• feat(remap transform): Add parse_common_log function #6230
• chore(external docs): New Remap conditions syntax #6239
• chore(remap): condition without subfields is set to Remap source #6255
• fix(remap): parse_syslog function should error on an invalid syslog message #6262
• chore(external docs, remap): Fix various function documentation problems #6269
• fix(remap): parse_grok should error when it fails to parse #6271
• fix(remap): Fix is_nullish input type issue #6272

---

• feat(remap transform): Add parse_glog function #6293
• enhancement(remap): Add charset option to decode_base64 function #6296
• chore(remap, external docs): Final Remap docs tweaks #6310
• enhancement(remap): Add join function #6313
• chore(tests): Fix error message for parse_regex::tests::find_no_match #6314
• chore(remap, external docs): Document compile-time errors #6325
• fix(remap): Re-flatten the remap-functions directory tree #6335
• enhancement(external docs): Add docs for the VRL join function #6371
• chore: Remap documentation updates with new parser #6422
• chore(remap): docs for the Remap type functions #6446
• enhancement(remap): improved type definitions for or with nullable fields #6462
• chore(remap): add type def test case #6468
• chore(remap): improve operation type defs #6471

[pablosichert]

I reviewed all of the PRs that have been merged between the opening of #6353 and now.

Really weird that #6052 has been dropped, since that landed on Jan 19, but the first commit on #6353 was on Feb 4.

[jszwedko]

It looks like the parent commit of the first commit on #6353 is 7e5f6ba which is actually January 19th so that branch was likely branched from a stale master.

[jszwedko]

That might also mean you should expand the search window for possibly affected PRs?

[pablosichert]

Very good point @jszwedko! Will do.

[pablosichert]

Interesting, I remember exactly encountering and fixing it in passing: #6229.

Which affirms your point 😄

[pablosichert]

Let's hope I caught all. I didn't exhaustively review the huge pull requests, but did lots of probes for smaller changes.