docs(sql): update SQL syntax for WINDOW and JOIN #3555
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SQL changes mainly from 4paradigm#3533 and 4paradigm#3554
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| - 右表 TableRef | ||
| 1. 仅支持`LAST JOIN`类型。 | ||
| 2. 至少有一个JOIN条件是形如`left_source.column=right_source.column`的EQUAL条件，**并且`right_source.column`列需要命中右表的索引（key 列）**。 | ||
| 3. 带排序LAST JOIN的情况下，`ORDER BY`只支持单列的列引用表达式，列类型为 int16, int32, int64 or timestamp, **并且列需要命中右表索引的时间列**。满足条件 2 和 3 的情况我们简单称做表能被 LAST JOIN 的 JOIN 条件优化 |
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ts column type should be bigint or timestamp? Can we order by?
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the five types is supported in SQL engine, is there any difference in deployment ?
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Yes, if you deploy, creating index will be failed
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that's indeed index's restriction, anyway I've remove the two types in case confusing.
docs/zh/openmldb_sql/deployment_manage/ONLINE_REQUEST_REQUIREMENTS.md
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| - **Since OpenMLDB 0.8.0** 带 WHERE 条件过滤的简单列筛选 ( 例如 `select * from tb where id > 10`) | ||
| - 窗口聚合子查询, 例如 `select id, count(val) over w as cnt from t1 window w as (...)`. | ||
| - OpenMLDB 0.8.4 之前, LAST JOIN 的窗口聚合子查询需要和 LAST JOIN 的左边输入 source 有相同的主表 | ||
| - [ALPHA] OpenMLDB >= 0.8.4, 允许 LAST JOIN 下的窗口聚合子查询不带主表. 详细见下面的例子 |
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这个例子不能体现？可否加一个不是主表的例子。也要和“没有主表”区别开，“不带主表”这个词有点歧义
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dl239
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Nov 16, 2023
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vagetablechicken
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Nov 20, 2023
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most SQL changes come from #3533, #3554, #3565, #3576