Jesus Camacho Rodriguez created CALCITE-1578: ------------------------------------------------
Summary: Druid adapter: wrong semantics of topN query limit with granularity Key: CALCITE-1578 URL: https://issues.apache.org/jira/browse/CALCITE-1578 Project: Calcite Issue Type: Bug Components: druid Affects Versions: 1.11.0 Reporter: Jesus Camacho Rodriguez Assignee: Jesus Camacho Rodriguez Priority: Critical Semantics of Druid topN query with limit and granularity is not equivalent to input SQL. In particular, limit is applied on each granularity value, not on the overall query. Currently, the following query will be transformed into a topN query: {code:sql} SELECT i_brand_id, floor_day(`__time`), max(ss_quantity), sum(ss_wholesale_cost) as s FROM store_sales_sold_time_subset GROUP BY i_brand_id, floor_day(`__time`) ORDER BY s DESC LIMIT 10; {code} Previous query outputs at most 10 rows. In turn, the equivalent SQL query for a Druid topN query should be expressed as: {code:sql} SELECT rs.i_brand_id, rs.d, rs.m, rs.s FROM ( SELECT i_brand_id, floor_day(`__time`) as d, max(ss_quantity) as m, sum(ss_wholesale_cost) as s, ROW_NUMBER() OVER (PARTITION BY floor_day(`__time`) ORDER BY sum(ss_wholesale_cost) DESC ) AS rownum FROM store_sales_sold_time_subset GROUP BY i_brand_id, floor_day(`__time`) ) rs WHERE rownum <= 10; {code} -- This message was sent by Atlassian JIRA (v6.3.4#6332)