feat: Postgres Citus Data HLL plugin implementation (#601) Thanks to @…

…milanbella ! * pg_approx_hll * pg_approx_hll * pg_approx_hll Co-authored-by: milan.bella@ibm.com <milan.bella@ibm.com> Fixes #563
cube-js · Apr 20, 2020 · be85ac6 · be85ac6
1 parent 6fbd703
commit be85ac6
Showing 1 changed file with 12 additions and 0 deletions.
diff --git a/packages/cubejs-schema-compiler/adapter/PostgresQuery.js b/packages/cubejs-schema-compiler/adapter/PostgresQuery.js
@@ -29,6 +29,18 @@ class PostgresQuery extends BaseQuery {
   timeGroupedColumn(granularity, dimension) {
     return `date_trunc('${GRANULARITY_TO_INTERVAL[granularity]}', ${dimension})`;
   }
+
+  hllInit(sql) {
+    return `hll_add_agg(hll_hash_any(${sql}))`;
+  }
+
+  hllMerge(sql) {
+    return `hll_cardinality(hll_union_agg(${sql}))`;
+  }
+
+  countDistinctApprox(sql) {
+    return `hll_cardinality(hll_add_agg(hll_hash_any(${sql})))`;
+  }
 }
 
 module.exports = PostgresQuery;