ST_AsMVT support parsing keys/values from a jsonb column

[Björn Harrtell]

In 15385:

ST_AsMVT parse JSONB into keys/values
References #3749

[Björn Harrtell]

Remaining tasks:

• Document this feature
• Make it conditionally included for PG 9.4+

[strk]

Build fails on Drone due to: "fatal error: utils/jsonb.h: No such file or directory" See ​https://drone.osgeo.org/postgis/postgis/38

[strk]

Fails on my dev machine (Ubuntu 16.04.2 LTS) with the same error.

[Björn Harrtell]

I thought this was because PG < 9.4 and intend to make this feature conditional. Does it look like there might be another reason for the fail?

[robe]

I think it's the 9.3 issue.

I see dronie is running:

PostgreSQL version: PostgreSQL 9.3.13

I suspect strk is running an antiquated version of PostgreSQL as well.

I'm rerunning debbie and winnie. They too were failing with 9.3 (with same error) but then they got an unrelated error which might just be an issue with simulatneous runs of other things or a memory leak crashing their postgres instance.

[Björn Harrtell]

In 15387:

ST_AsMVT JSONB support and regression tests conditional on PG ≥ 94
Fixes #3749

[Björn Harrtell]

In 15389:

ST_AsMVT Normalize output to make sure it will be identical regardless of GEOS version
References #3749

[Björn Harrtell]

In 15390:

ST_AsMVT Document JSONB support
References #3749