{"id":16703171,"url":"https://github.com/phstudy/zetasketch-bigquery-example","last_synced_at":"2026-05-17T21:04:03.424Z","repository":{"id":148596482,"uuid":"234259446","full_name":"phstudy/zetasketch-bigquery-example","owner":"phstudy","description":"An example demonstrates how to use ZetaSketch with BigQuery","archived":false,"fork":false,"pushed_at":"2020-01-20T09:01:09.000Z","size":55,"stargazers_count":0,"open_issues_count":0,"forks_count":0,"subscribers_count":3,"default_branch":"master","last_synced_at":"2025-01-21T02:41:37.276Z","etag":null,"topics":["bigquery","hll","java","zetasketch"],"latest_commit_sha":null,"homepage":"","language":"Java","has_issues":true,"has_wiki":null,"has_pages":null,"mirror_url":null,"source_name":null,"license":null,"status":null,"scm":"git","pull_requests_enabled":true,"icon_url":"https://github.com/phstudy.png","metadata":{"files":{"readme":"README.md","changelog":null,"contributing":null,"funding":null,"license":null,"code_of_conduct":null,"threat_model":null,"audit":null,"citation":null,"codeowners":null,"security":null,"support":null,"governance":null,"roadmap":null,"authors":null,"dei":null,"publiccode":null,"codemeta":null}},"created_at":"2020-01-16T07:20:29.000Z","updated_at":"2020-01-20T09:01:11.000Z","dependencies_parsed_at":"2023-05-20T16:15:10.347Z","dependency_job_id":null,"html_url":"https://github.com/phstudy/zetasketch-bigquery-example","commit_stats":null,"previous_names":[],"tags_count":0,"template":false,"template_full_name":null,"repository_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/phstudy%2Fzetasketch-bigquery-example","tags_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/phstudy%2Fzetasketch-bigquery-example/tags","releases_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/phstudy%2Fzetasketch-bigquery-example/releases","manifests_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/phstudy%2Fzetasketch-bigquery-example/manifests","owner_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/owners/phstudy","download_url":"https://codeload.github.com/phstudy/zetasketch-bigquery-example/tar.gz/refs/heads/master","host":{"name":"GitHub","url":"https://github.com","kind":"github","repositories_count":243544657,"owners_count":20308169,"icon_url":"https://github.com/github.png","version":null,"created_at":"2022-05-30T11:31:42.601Z","updated_at":"2022-07-04T15:15:14.044Z","host_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub","repositories_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories","repository_names_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repository_names","owners_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/owners"}},"keywords":["bigquery","hll","java","zetasketch"],"created_at":"2024-10-12T19:07:18.084Z","updated_at":"2026-05-17T21:04:03.328Z","avatar_url":"https://github.com/phstudy.png","language":"Java","funding_links":[],"categories":[],"sub_categories":[],"readme":"Example ZetaSketch with BigQuery\n=================================\n\nAn Example demonstrates how to use [ZetaSketch](https://github.com/google/zetasketch) with [BigQuery](https://cloud.google.com/bigquery/docs/reference/standard-sql/hll_functions).\n\n# How to run\n```bash\n$ git clone https://github.com/phstudy/zetasketch-bigquery-example.git\n$ cd zetasketch-bigquery-example\n$ GOOGLE_APPLICATION_CREDENTIALS=/path/to/my/key.json ./gradlew run\n```\n\n# Sample code\n### Generate ZetaSketch HLL\n\n```java\nHyperLogLogPlusPlus\u003cString\u003e hll = new HyperLogLogPlusPlus.Builder().buildForStrings();\n\nhll.add(\"apple\");\nhll.add(\"orange\");\nhll.add(\"banana\");    \n```    \n\n### Generate HLL in BigQuery and deserialize as ZetaSketch HLL object\n```java\nString sql = //\n          \"SELECT\"\n        + \"  HLL_COUNT.INIT(fruit) AS fruit_hll\"\n        + \" FROM UNNEST(['apple', 'orange', 'banana']) AS fruit\";\n\nTableResult result = queryBigQuery(sql);\n\nFieldValueList row = result.getValues().iterator().next();\nbyte[] hllBytes = row.get(\"fruit_hll\").getBytesValue();\nHyperLogLogPlusPlus\u003cString\u003e rst = (HyperLogLogPlusPlus\u003cString\u003e) HyperLogLogPlusPlus.forProto(hllBytes);\n```    \n### Serialize ZetaSketch HLL object and calculate cardinality in BigQuery\n```java\nString base64Str = Base64.getEncoder().encodeToString(hll.serializeToByteArray());\nString sql = \"SELECT HLL_COUNT.EXTRACT(FROM_BASE64('\" + base64Str + \"')) AS fruit_cnt\";\n\nTableResult result = queryBigQuery(sql);\n\nFieldValueList row = result.getValues().iterator().next();\nlong cnt = row.get(\"fruit_cnt\").getLongValue();\n```","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fphstudy%2Fzetasketch-bigquery-example","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fphstudy%2Fzetasketch-bigquery-example","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fphstudy%2Fzetasketch-bigquery-example/lists"}