{
   "name": "count_distinct",
   "abstract": "Aggregate for computing number of distinct values using a hash table.",
   "description": "The regular COUNT(DISTINCT ...) always performs a sort, which results in bad performance if there's a lot of duplicate values. This extension implements custom count_distinct aggregate function that uses a hash table to achieve the same purpose. So far there are only INT and BIGINT aggregates, but extending it to other data types should not be difficult.",
   "version": "1.3.1",
   "maintainer": "Tomas Vondra <tv@fuzzy.cz>",
   "license": "bsd",
   "prereqs": {
      "runtime": {
         "requires": {
            "PostgreSQL": "8.4.0"
         }
      }
   },
   "provides": {
     "count_distinct": {
       "file": "sql/count_distinct--1.3.1.sql",
       "docfile" : "README.md",
       "version": "1.3.1"
     }
   },
   "resources": {
      "repository": {
        "url":  "https://github.com/tvondra/count_distinct.git",
        "web":  "http://github.com/tvondra/count_distinct",
        "type": "git"
      }
   },
   "tags" : ["count", "distinct", "aggregate"],
   "meta-spec": {
      "version": "1.0.0",
      "url": "http://pgxn.org/meta/spec.txt"
   },
   "release_status" : "stable"
}