Re: JSONpath query that returns paths to the matches

Hi David,

Thank you for the swift reply. After ruling out the option of doing that by
leveraging JSONPath, I took a different approach and wrote a function
in pl/pgsql
that does not need these paths at all. I could deviate a bit, because I had
some wiggle room in the context of the bigger problem I was working on.

For others who might be confronted with a similar problem in the future,
here is a minimal example that uses Python and a library called jsonpath_ng,
which tells you what the match is and where it occurs:

```
# pip install jsonpath_ng

import json
from jsonpath_ng import jsonpath, parse

raw = '''{
"this": "that",
"that": [{"x": "aaa"},{"y": "missed"}],
"nested": {
"deep": {
"x": "bbb"
}
}
}'''

data = json.loads(raw)
query = parse('$..x')

results = query.find(data)
for entry in results:
print(f'{entry.full_path} -> {entry.value}')

# that.[0].x -> aaa
# nested.deep.x -> bbb
```

Porting this to pl/python is left as an exercise for the reader :-)