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thanos / Cardinality-Algorithm-Comparison.md
Last active March 13, 2026 18:50
Cardinality Algorithm Comparison
Algorithm Memory Accuracy Notes
HyperLogLog Small ~1% Industry standard
CPC Smaller Apache DataSketches; more complex
UltraLogLog Very compact Similar Modern variant; even more complex
@thanos
thanos / Heavy-Hitter_Algorithm_Comparison.md
Last active March 13, 2026 17:39
Algorithm Memory Accuracy Notes
Count-Min Sketch Small ~1% Simple, widely supported
Misra-Gries Small Exact top-K Deterministic but less mergeable
Count Sketch Small Better for sparse data Handles negative updates
SpaceSaving Small Accurate Used in streaming systems
@thanos
thanos / virtual_field_option.ex
Created October 13, 2024 17:08
an example of a calculated virtual field used in a Many field's option for Backpex
options_query: fn query, _assigns ->
select_merge(
query,
[media],
%{label: fragment("concat(?, ', ', ?)", media.caption, media.original_file)}
)
end
@thanos
thanos / select_merge_example.ex
Created October 13, 2024 17:05
A select merge example for populating a virtual field
defmodule Answer do
use Ecto.Schema
schema "answer" do
field :word, :string
field :length, :integer, virtual: true
end
end
Repo.insert(%Answer{word: "SWANS"})
@thanos
thanos / xeni_travel_api_hotel_availability.sh
Last active August 26, 2023 17:26
Using Xeni Travel Api to fetch a hotel detail and it's availability
curl -X 'GET' "$XENI_API_HOST/api/accommodation_searches/accommodation?search_id=962c9315-0e35-45e3-b158-be10c860912d&property_id=40553&raw=true" \
-H "accept: application/json" \
-H "authorization: bearer: $XENI_TOKEN"
@thanos
thanos / xeni_search_hotel_availability.sh
Last active August 26, 2023 17:24
searching for hotel availability using the Xeni Travel API
curl -X 'POST' \
"$XENI_API_HOST/api/accommodation_searches/search" \
-H "accept: application/json" \
-H "Content-Type: application/json" \
-H "authorization: bearer: $XENI_TOKEN" \
-d '{
"check_in": "2023-08-27",
"check_out": "2023-08-30",
"destination_id": "bbc35c49-d2a7-431a-ac40-a4944c3a00e7",
"occupancies": [
@thanos
thanos / xeni_travel_api_set_envs.sh
Last active August 26, 2023 16:23
setting up environmental variables for XENI Trade API
export XENI_API_HOST="https://xenitravelapi-beta01.gigalixirapp.com"
export XENI_USER_EMAIL="[email protected]"
export XENI_USER_PASSWORD="some password"
export XENI_TOKEN=$(curl -X 'POST' $XENI_API_HOST/api/accounts/get_token \
-H 'accept: application/json' \
-H 'content-type: application/json' \
-d '{"user":{"email": "'"$XENI_USER_EMAIL"'", "password": "'"$XENI_USER_PASSWORD"'"}}' \
| sed "s/{.*\"token\":\"\([^\"]*\).*}/\1/g")
@thanos
thanos / xeni_travel_api_get_token.sh
Last active August 26, 2023 17:11
Get a token from the Xeni Travel API
curl -X 'POST' "$XENI_API_HOST/api/accounts/get_token" \
-H "accept: application/json" \
-H "content-type: application/json" \
-d '{"user":{"email": "'"$XENI_USER_EMAIL"'", "password": "'"$XENI_USER_PASSWORD"'"}}'
{"token":"eyJhbGciOiJIUzUxMiIsInR5cCI6IkpXVCJ9.eyJhdWQiOiJ4ZW5pX3RyYXZlbF9hcGkiLCJleHAiOjE2OTI0MTA1ND9A"}
@thanos
thanos / fetch_locations.sh
Last active August 26, 2023 17:14
Gets a list of locations, based on a search thing, from the Xeni travel api
# an alternative to "python -m json.tool" is "json_pp -json_opt pretty,canonical"
curl -X 'GET' \
"$XENI_API_HOST/api/locations/search?starts_with=New%20York" \
-H "accept: application/json" \
-H "authorization: bearer: $XENI_TOKEN" \
| python -m json.tool
{
"data": [
@thanos
thanos / zentrum-hotel.json
Last active February 3, 2023 17:37
A Zentrum hotel record
{
"category": "Hotel",
"chainName": "HYATT",
"checkinInfo": {
"minAge": "0"
},
"checkoutInfo": {},
"contact": {