add aggregates first cut

hasura · Oct 29, 2024 · 29cacad · 29cacad
1 parent 1ada467
commit 29cacad
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Showing 3 changed files with 81 additions and 24 deletions.
diff --git a/connector-definition/template/index.ts b/connector-definition/template/index.ts
@@ -7,23 +7,6 @@ import { GoogleCalendar, GMail} from "@hasura/ndc-duckduckapi/services";
 const connectorConfig: duckduckapi = {
   dbSchema: `
 
-    DROP TABLE IF EXISTS users;
-    CREATE TABLE users (
-    id integer primary key,
-    name text
-    );
-
-    INSERT INTO users (id, name) VALUES
-    (1, 'Alice Johnson'),
-    (2, 'Bob Smith'),
-    (3, 'Carol Martinez'),
-    (4, 'David Kim'),
-    (5, 'Emma Wilson'),
-    (6, 'Frank Zhang'),
-    (7, 'Grace Lee'),
-    (8, 'Henry Garcia'),
-    (9, 'Isabel Patel'),
-    (10, 'Jack Thompson');
     -- Add your SQL schema here.
     -- This SQL will be run on startup every time.
     -- CREATE TABLE SAAS_TABLE_NAME (.....);

diff --git a/ndc-duckduckapi/src/constants.ts b/ndc-duckduckapi/src/constants.ts
@@ -5,6 +5,7 @@ export const CAPABILITIES_RESPONSE: Capabilities = {
   query: {
     variables: {},
     nested_fields: {},
+    aggregates: {}
   },
   mutation: {
     transactional: null,

diff --git a/ndc-duckduckapi/src/handlers/query.ts b/ndc-duckduckapi/src/handlers/query.ts
@@ -269,11 +269,57 @@ function build_query(
   let order_by_sql = ``;
   let collect_rows = [];
   let where_conditions = ["WHERE 1"];
+
   if (query.aggregates) {
     run_agg = true;
-    agg_sql = "... todo";
-    throw new Forbidden("Aggregates not implemented yet!", {});
+    let agg_columns: string[] = [];
+
+    // Process each aggregate
+    for (const [agg_name, agg_value] of Object.entries(query.aggregates)) {
+      if (agg_value.type === "star_count") {
+        agg_columns.push(`COUNT(*) as ${escape_double(agg_name)}`);
+      } else if (agg_value.type === "column_count") {
+        // Handle column count aggregation
+        const column_expr = agg_value.distinct 
+          ? `COUNT(DISTINCT ${escape_double(collection_alias)}.${escape_double(agg_value.column)})`
+          : `COUNT(${escape_double(collection_alias)}.${escape_double(agg_value.column)})`;
+        agg_columns.push(`${column_expr} as ${escape_double(agg_name)}`);
+      } else {
+        throw new Forbidden(`Aggregate type ${agg_value.type} not implemented yet!`, {});
+      }
+    }
+
+    let from_sql = `${collection} as ${escape_double(collection_alias)}`;
+    if (path.length > 1 && relationship_key !== null) {
+      let relationship = query_request.collection_relationships[relationship_key];
+      let parent_alias = path.slice(0, -1).join("_");
+      let relationship_alias = config.duckdbConfig.collection_aliases[relationship.target_collection];
+      from_sql = `${relationship_alias} as ${escape_double(collection_alias)}`;
+      where_conditions.push(
+        ...Object.entries(relationship.column_mapping).map(([from, to]) => {
+          return `${escape_double(parent_alias)}.${escape_double(from)} = ${escape_double(collection_alias)}.${escape_double(to)}`;
+        }),
+      );
+    }
+
+    if (query.predicate) {
+      where_conditions.push(
+        `(${build_where(query.predicate, query_request.collection_relationships, agg_args, variables, collection_alias, config.duckdbConfig.collection_aliases)})`
+      );
+    }
+
+    agg_sql = wrap_data(`
+      SELECT JSON_OBJECT(
+        ${agg_columns.map(col => {
+          const parts = col.split(' as ');
+          return `${escape_single(parts[1].replace(/"/g, ''))}, ${parts[0]}`;
+        }).join(',')}
+      ) as data
+      FROM ${from_sql}
+      ${where_conditions.join(" AND ")}
+    `);
   }
+
   if (query.fields) {
     run_sql = true;
     for (let [field_name, field_value] of Object.entries(query.fields)) {
@@ -493,17 +539,44 @@ export async function perform_query(
   state: State,
   query_plans: SQLQuery[],
 ): Promise<QueryResponse> {
-  // const con = state.client.connect();
   const response: RowSet[] = [];
   for (let query_plan of query_plans) {
     try {
       const connection = await state.client.getSyncConnection();
-      const res = await do_all(connection, query_plan);
-      const row_set = JSON.parse(res[0]["data"] as string) as RowSet;
+      let row_set: RowSet = { rows: [] };
+
+      // Handle aggregate query if present
+      if (query_plan.runAgg) {
+        const aggRes = await do_all(connection, {
+          runSql: true,
+          runAgg: false,
+          sql: query_plan.aggSql,
+          args: query_plan.aggArgs,
+          aggSql: "",
+          aggArgs: []
+        });
+        const parsedAggData = JSON.parse(aggRes[0]["data"]);
+        row_set.aggregates = parsedAggData;
+      }
+
+      // Handle regular query if present
+      if (query_plan.runSql) {
+        const res = await do_all(connection, {
+          runSql: true,
+          runAgg: false,
+          sql: query_plan.sql,
+          args: query_plan.args,
+          aggSql: "",
+          aggArgs: []
+        });
+        const regular_results = JSON.parse(res[0]["data"]);
+        row_set.rows = regular_results.rows;
+      }
       response.push(row_set);
     } catch (err) {
-      console.error('RAAAAAAAAAAAAAAAAAAAAAAR.perform_query:: ' + "Error performing query: " + err);
+      console.error('Error performing query: ' + err);
+      throw err;
     }
   }
   return response;
-}
+}