[Doris On ES] Support fetch _id field from ES
#3900
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wuyunfeng
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_id field from ES
wuyunfeng
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_id field from ES_id field from ES
morningman
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Jun 18, 2020
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More information can be found: apache#3901 The created ES external Table must contains `_id` column if you want to fetch the Elasticsearch document `_id`. ``` CREATE EXTERNAL TABLE `doe_id2` ( `_id` varchar COMMENT "", `city` varchar COMMENT "" ) ENGINE=ELASTICSEARCH PROPERTIES ( "hosts" = "http://10.74.167.16:8200", "user" = "root", "password" = "root", "index" = "doe", "type" = "doc", "version" = "6.5.3", "enable_docvalue_scan" = "true", "transport" = "http" ); Query: ``` mysql> select * from doe_id2 limit 10; +----------------------+------+ | _id | city | +----------------------+------+ | iRHNc3IB8XwmcbhB7lEB | gz | | jBHNc3IB8XwmcbhB71Ef | gz | | jRHNc3IB8XwmcbhB71GI | gz | | jhHNc3IB8XwmcbhB71Hx | gz | | ThHNc3IB8XwmcbhBkFHB | sh | | TxHNc3IB8XwmcbhBkFH9 | sh | | URHNc3IB8XwmcbhBklFA | sh | | ahHNc3IB8XwmcbhBxlFq | gz | | axHNc3IB8XwmcbhBxlHw | gz | | bxHNc3IB8XwmcbhByVFO | gz | +----------------------+------+ ``` NOTICE: This change the column name format to support column name start with "_".
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More information can be found: #3901
The created ES external Table must contains
_idcolumn if you want to fetch the Elasticsearch document_id.mysql> select * from doe_id2 limit 10;
+----------------------+------+
| _id | city |
+----------------------+------+
| iRHNc3IB8XwmcbhB7lEB | gz |
| jBHNc3IB8XwmcbhB71Ef | gz |
| jRHNc3IB8XwmcbhB71GI | gz |
| jhHNc3IB8XwmcbhB71Hx | gz |
| ThHNc3IB8XwmcbhBkFHB | sh |
| TxHNc3IB8XwmcbhBkFH9 | sh |
| URHNc3IB8XwmcbhBklFA | sh |
| ahHNc3IB8XwmcbhBxlFq | gz |
| axHNc3IB8XwmcbhBxlHw | gz |
| bxHNc3IB8XwmcbhByVFO | gz |
+----------------------+------+