MemSql GEOGRAPHY_DISTANCE,GEOGRAPHY_CONTAINS,GEOGRAPHY_WITHIN_DISTANCE 不起作用并返回 null答案

【问题标题】：MemSql GEOGRAPHY_DISTANCE,GEOGRAPHY_CONTAINS,GEOGRAPHY_WITHIN_DISTANCE is not working and returning nullMemSql GEOGRAPHY_DISTANCE,GEOGRAPHY_CONTAINS,GEOGRAPHY_WITHIN_DISTANCE 不起作用并返回 null
【发布时间】：2019-02-07 08:50:07
【问题描述】：

它没有返回任何数字，它返回null。

SELECT round(GEOGRAPHY_DISTANCE("GEOGRAPHY_POINT(-97.741890, 30.219940)", "POLYGON ((-97.11090087890626 33.08693925905123,-96.52862548828126 33.063924198120645,-96.56158447265626 32.80343616698929,-97.06970214843751 32.778037985363675,-97.11090087890626 33.08693925905123))"),0) FROM DUAL;

SELECT GEOGRAPHY_WITHIN_DISTANCE("GEOGRAPHY_POINT(96.843820, 32.926290)","POLYGON ((-97.11090087890626 33.08693925905123,-96.52862548828126 33.063924198120645,-96.56158447265626 32.80343616698929,-97.06970214843751 32.778037985363675,-97.11090087890626 33.08693925905123))",1000) from dual;

任何人都可以帮助使这个 memsql 地理空间功能工作

【问题讨论】：

您的POINTs 指定的不是错误的吗？这两个值不应该是空格分隔和long lat，而不是lat,long吗？
@Damien_The_Unbeliever 是的，它的 lon，lat ...已更正它，但它仍然显示为空。不要认为它的空间为 ref 分开：docs.memsql.com/sql-reference/v6.7/geography_point
GEOGRAPHY_POINT 不是 WKT - 在WKT中，它只是POINT
成功了。谢谢:-)
我在表格中维护纬度和多边形（数据类型：GEOGRAPHY）。我可以在表中维护 POINT 数据类型吗？就像我为 GEOGRAPHY_POINT 维护的那样，我可以计算多条记录的距离？ E:G 创建表 (... LAT DECIMAL(10,7) NOT NULL, LON DECIMAL(10,7) NOT NULL, VEHICLE_GEO_POINT as geography_point(lon, lat) 持久化地理点, index(VEHICLE_GEO_POINT), ... )

标签： singlestore

【解决方案1】：

扩展 Damien_The_Unbeliever 上面的回答，GEOGRAPHY_POINT 语法不应该在字符串中。您可以在 WKT 语法 POINT(long lat) 中定义字符串中的点，也可以使用 GEOGRAPHY_POINT 语法（但不在字符串中）。

因此，对于您的第一个不起作用的查询：

memsql> SELECT round(GEOGRAPHY_DISTANCE("GEOGRAPHY_POINT(-97.741890, 30.219940)", "POLYGON ((-97.11090087890626 33.08693925905123,-96.52862548828126 33.063924198120645,-96.56158447265626 32.80343616698929,-97.06970214843751 32.778037985363675,-97.11090087890626 33.08693925905123))"),0) FROM DUAL;
+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| round(GEOGRAPHY_DISTANCE("GEOGRAPHY_POINT(-97.741890, 30.219940)", "POLYGON ((-97.11090087890626 33.08693925905123,-96.52862548828126 33.063924198120645,-96.56158447265626 32.80343616698929,-97.06970214843751 32.778037985363675,-97.11090087890626 33.086939 |
+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|                                                                                                                                                                                                                                                             NULL |
+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
1 row in set, 1 warning (0.39 sec)

memsql> show warnings;
+---------+------+----------------------------------------------------+
| Level   | Code | Message                                            |
+---------+------+----------------------------------------------------+
| Warning | 1862 | You have an error in your WKT syntax at position 0 |
+---------+------+----------------------------------------------------+
1 row in set (0.00 sec)

你可以正确地写成以下两种：

memsql> SELECT round(GEOGRAPHY_DISTANCE("POINT(-97.741890 30.219940)", "POLYGON ((-97.11090087890626 33.08693925905123,-96.52862548828126 33.063924198120645,-96.56158447265626 32.80343616698929,-97.06970214843751 32.778037985363675,-97.11090087890626 33.08693925905123))"),0) FROM DUAL;
+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| round(GEOGRAPHY_DISTANCE("POINT(-97.741890 30.219940)", "POLYGON ((-97.11090087890626 33.08693925905123,-96.52862548828126 33.063924198120645,-96.56158447265626 32.80343616698929,-97.06970214843751 32.778037985363675,-97.11090087890626 33.08693925905123))" |
+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|                                                                                                                                                                                                                                                           291334 |
+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
1 row in set (0.31 sec)

memsql> SELECT round(GEOGRAPHY_DISTANCE(GEOGRAPHY_POINT(-97.741890, 30.219940), "POLYGON ((-97.11090087890626 33.08693925905123,-96.52862548828126 33.063924198120645,-96.56158447265626 32.80343616698929,-97.06970214843751 32.778037985363675,-97.11090087890626 33.08693925905123))"),0) FROM DUAL;
+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| round(GEOGRAPHY_DISTANCE(GEOGRAPHY_POINT(-97.741890, 30.219940), "POLYGON ((-97.11090087890626 33.08693925905123,-96.52862548828126 33.063924198120645,-96.56158447265626 32.80343616698929,-97.06970214843751 32.778037985363675,-97.11090087890626 33.08693925 |
+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|                                                                                                                                                                                                                                                           291334 |
+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
1 row in set (0.54 sec)

【讨论】：