Question

以下语法来自更大的Vertica查询（postgreSQL）。是否可以将此语法转换为Hive？运营商是一致的。如果是这样，怎么样？

当前错误是： FAILED：ParseException 22:19无法识别＆＃39; |＆＃39;附近的输入＆＃39; CAST＆＃39; ＆＃39;（＆＃39;在表达式规范中

 ST_GeomFromText('POLYGON((' || 
    CAST(TRUNC(request_lng / {{zoom_factor}},2) AS numeric) * {{zoom_factor}} + sign(request_lng)*(.01 * {{zoom_factor}})
    || ' ' ||
    CAST(TRUNC(request_lat / ({{zoom_factor}} * {{stretch_factor}}),2) AS numeric) * ({{zoom_factor}}*{{stretch_factor}}) + sign(request_lat)*(.01 * {{zoom_factor}} * {{stretch_factor}})
    || ', ' ||
    CAST(TRUNC(request_lng / {{zoom_factor}},2) AS numeric) * {{zoom_factor}} + sign(request_lng)*(.01 * {{zoom_factor}})
    || ' ' ||
    CAST(TRUNC(request_lat / ({{zoom_factor}} * {{stretch_factor}}),2) AS numeric) * ({{zoom_factor}}*{{stretch_factor}}) 
    || ', ' ||
    CAST(TRUNC(request_lng / {{zoom_factor}},2) AS numeric) * {{zoom_factor}}  
    || ' ' ||
    CAST(TRUNC(request_lat / ({{zoom_factor}} * {{stretch_factor}}),2) AS numeric) * ({{zoom_factor}}*{{stretch_factor}}) 
    || ', ' ||
    CAST(TRUNC(request_lng / {{zoom_factor}},2) AS numeric) * {{zoom_factor}}  
    || ' ' ||
    CAST(TRUNC(request_lat / ({{zoom_factor}} * {{stretch_factor}}),2) AS numeric) * ({{zoom_factor}}*{{stretch_factor}}) + sign(request_lat)*(.01 * {{zoom_factor}} * {{stretch_factor}})
    || ', ' ||
    CAST(TRUNC(request_lng / {{zoom_factor}},2) AS numeric) * {{zoom_factor}} + sign(request_lng)*(.01 * {{zoom_factor}})
    || ' ' ||
    CAST(TRUNC(request_lat / ({{zoom_factor}} * {{stretch_factor}}),2) AS numeric) * ({{zoom_factor}}*{{stretch_factor}}) + sign(request_lat)*(.01 * {{zoom_factor}} * {{stretch_factor}})
    ||'))') as geography

Answer 1

此时，Hive不支持空间查询。

https://issues.apache.org/jira/browse/HIVE-5168 https://cwiki.apache.org/confluence/display/Hive/Spatial+queries（设计文档）

将Cast语法从PostgreSQL转换为Hive

1 个答案: