POSTGRES jsonb document GIN Indexes are created on what all objects? - postgresql

Question

I am using Postgres DB 13.5. From pgdocs -
The technical difference between a jsonb_ops and a jsonb_path_ops GIN
index is that the former creates independent index items for each key
and value in the data, while the latter creates index items only for
each value in the data. Basically, each jsonb_path_ops index item
is a hash of the value and the key(s) leading to it; for example to
index {"foo": {"bar": "baz"}}
Understanding the above in detail is important for me coz my jdata (document) is big with many keys and nested objects. Consider my json data that is stored as jsonb in a column named jdata looks like below -
{
"supplier": {
"id": "3c67b6eb-3b0d-492d-8736-66df107b83b3",
"customer": {
"type": "pro",
"name": "John George",
"address": [
{
"add-id": "098ad4df-2a90-4fda-8f92-dbe8d7196732",
"addressActive": true,
"street": "abc street",
"zip": 94044,
"staying-since": "long long",
"accessibility": {
"traffic": "heavy/congested",
"bestwaytoreach": {
"weekdays": {
"bart/metro/calltrain": true,
"price": {
"off-peak-hours": "affordable",
"peak-hours": "high"
},
"journey-time": "super-fast"
}
},
"weekends": {
"byroad": {
"ok": true,
"distance": "long",
"has-tolls": {
"true": true,
"toll-price": "relatively-high"
},
"journey-speed": "fast"
}
}
}
},
{
"add-id": "ddd1d2a0-9050-4bcf-a3ad-2e608d65e468",
"addressActive": true,
"street": "xyz street",
"zip": 10001,
"staying-since": "moved recently",
"accessibility": {
"traffic": "heavy/congested",
"bestwaytoreach": {
"weekdays": {
"subway": true,
"price": {
"off-peak-hours": "affordable",
"peak-hours": "high"
},
"journey-speed": "super-fast"
}
},
"weekends": {
"byroad": {
"ok": true,
"distance": "moderate",
"tolls": {
"has-tolls": true,
"toll-price": "relatively-high"
},
"journey-time": "super-fast"
}
}
}
}
],
"firstName": "John",
"lastName": "CRAWFORD",
"emailAddresses": {
"personal": [
"johnreplies#jg.com",
"ursjohn#jg.com",
"1234#jg.com"
],
"official": [
{
"repies-in": "1 day",
"email": "jg#jg.com"
},
{
"check's regularly": true,
"repies-in": "1 Hour",
"email": "jg-watching#jg.com"
}
]
},
"cities": [
"NYC",
"LA",
"SF",
"DC"
],
"splCustFlag": null,
"isPerson": true,
"isEntity": false,
"allowEmailSolicit": "Y",
"allowPhoneSolicit": "Y",
"taxPayer": true,
"suffix": null,
"title": null,
"birthDate": "05/10/1993",
"loyaltyPrograms": null,
"phoneNumbers-summary": [
1234567890,
1234567899,
1234567898,
1234567897
],
"phoneNumbers": [
{
"description": null,
"extension": null,
"number": 1234567890,
"countryCode": null,
"type": "Business"
},
{
"description": null,
"extension": null,
"number": 1234567899,
"countryCode": null,
"type": "Home"
}
],
"data-privacy": {
"required": true,
"laws": [
"CCPA",
"GDPR"
]
}
}
}
}
Now if I create GIN jsonb_ops index for jdata column - I want to clarify what all keys and values will be part of index.
For example - "staying-since" is a key nested at below path and it's part of "address" array too. But it's still a key, thought nested deep in the document. So will it be part of the index.
{
"supplier": {
"customer": {
"address": [
{
"staying-since": "long long" ...
And similarly "long long" is a value of a deeply nested key. Will it also be indexed.
And if GIN jsonb_path_ops index is created for jdata column --
Will a hash of "long long" value along with the path that leads to it will also be indexed.
hash(
"supplier": {
"customer": {
"address":[{"staying-since": "long long"}]
}
}
)
will the above also gets index.
I am aware about the operators that are supported by the GIN index types and am aware about the usage of these operators -
jsonb_ops ? ?& ?| #> #? ##
jsonb_path_ops #> #? ##