google-app-engine - 无论如何用 GAE 的搜索 API 进行 GROUP BY 和 COUNT 吗？

Question

我刚开始使用 GAE 的搜索 API，我正在寻找相当于 SQL group by count 语句的功能。目前是否存在类似的情况？

Answer 1

As @Daniel Roseman noted, GROUP BY does not apply for the full-text Search API.

On Datastore there is count (but it's very expensive) but no GROUP BY.

Google CLoud SQL: it's basically a managed MySql instance - both GROUP BY and COUNT are available.

Google Big Query is a distributed on-demand map-reduce system with SQL-like query language. It has both GROUP BY and COUNT. They are both expensive as queries are charged by rows x columns scanned (no indexes exist). BQ is very powerful (and fast) but exporting data to it from GAE is tedious as there is no direct API.

Answer 2

不，这根本不是它的用途。它是一个全文搜索 API，不支持分组或其他关系概念。